| # Copyright (C) 2001 Python Software Foundation | |
| # csv package unit tests | |
| import copy | |
| import sys | |
| import unittest | |
| from io import StringIO | |
| from tempfile import TemporaryFile | |
| import csv | |
| import gc | |
| import pickle | |
| from test import support | |
| from test.support import cpython_only, import_helper, check_disallow_instantiation | |
| from test.support.import_helper import ensure_lazy_imports | |
| from itertools import permutations | |
| from textwrap import dedent | |
| from collections import OrderedDict | |
| class BadIterable: | |
| def __iter__(self): | |
| raise OSError | |
| class Test_Csv(unittest.TestCase): | |
| """ | |
| Test the underlying C csv parser in ways that are not appropriate | |
| from the high level interface. Further tests of this nature are done | |
| in TestDialectRegistry. | |
| """ | |
| def _test_arg_valid(self, ctor, arg): | |
| ctor(arg) | |
| self.assertRaises(TypeError, ctor) | |
| self.assertRaises(TypeError, ctor, None) | |
| self.assertRaises(TypeError, ctor, arg, bad_attr=0) | |
| self.assertRaises(TypeError, ctor, arg, delimiter='') | |
| self.assertRaises(TypeError, ctor, arg, escapechar='') | |
| self.assertRaises(TypeError, ctor, arg, quotechar='') | |
| self.assertRaises(TypeError, ctor, arg, delimiter='^^') | |
| self.assertRaises(TypeError, ctor, arg, escapechar='^^') | |
| self.assertRaises(TypeError, ctor, arg, quotechar='^^') | |
| self.assertRaises(csv.Error, ctor, arg, 'foo') | |
| self.assertRaises(TypeError, ctor, arg, delimiter=None) | |
| self.assertRaises(TypeError, ctor, arg, delimiter=1) | |
| self.assertRaises(TypeError, ctor, arg, escapechar=1) | |
| self.assertRaises(TypeError, ctor, arg, quotechar=1) | |
| self.assertRaises(TypeError, ctor, arg, lineterminator=None) | |
| self.assertRaises(TypeError, ctor, arg, lineterminator=1) | |
| self.assertRaises(TypeError, ctor, arg, quoting=None) | |
| self.assertRaises(TypeError, ctor, arg, | |
| quoting=csv.QUOTE_ALL, quotechar='') | |
| self.assertRaises(TypeError, ctor, arg, | |
| quoting=csv.QUOTE_ALL, quotechar=None) | |
| self.assertRaises(TypeError, ctor, arg, | |
| quoting=csv.QUOTE_NONE, quotechar='') | |
| self.assertRaises(ValueError, ctor, arg, delimiter='\n') | |
| self.assertRaises(ValueError, ctor, arg, escapechar='\n') | |
| self.assertRaises(ValueError, ctor, arg, quotechar='\n') | |
| self.assertRaises(ValueError, ctor, arg, delimiter='\r') | |
| self.assertRaises(ValueError, ctor, arg, escapechar='\r') | |
| self.assertRaises(ValueError, ctor, arg, quotechar='\r') | |
| ctor(arg, delimiter=' ') | |
| ctor(arg, escapechar=' ') | |
| ctor(arg, quotechar=' ') | |
| ctor(arg, delimiter='\t', skipinitialspace=True) | |
| ctor(arg, escapechar='\t', skipinitialspace=True) | |
| ctor(arg, quotechar='\t', skipinitialspace=True) | |
| ctor(arg, delimiter=' ', skipinitialspace=True) | |
| self.assertRaises(ValueError, ctor, arg, | |
| escapechar=' ', skipinitialspace=True) | |
| self.assertRaises(ValueError, ctor, arg, | |
| quotechar=' ', skipinitialspace=True) | |
| ctor(arg, delimiter='^') | |
| ctor(arg, escapechar='^') | |
| ctor(arg, quotechar='^') | |
| self.assertRaises(ValueError, ctor, arg, delimiter='^', escapechar='^') | |
| self.assertRaises(ValueError, ctor, arg, delimiter='^', quotechar='^') | |
| self.assertRaises(ValueError, ctor, arg, escapechar='^', quotechar='^') | |
| ctor(arg, delimiter='\x85') | |
| ctor(arg, escapechar='\x85') | |
| ctor(arg, quotechar='\x85') | |
| ctor(arg, lineterminator='\x85') | |
| self.assertRaises(ValueError, ctor, arg, | |
| delimiter='\x85', lineterminator='\x85') | |
| self.assertRaises(ValueError, ctor, arg, | |
| escapechar='\x85', lineterminator='\x85') | |
| self.assertRaises(ValueError, ctor, arg, | |
| quotechar='\x85', lineterminator='\x85') | |
| def test_reader_arg_valid(self): | |
| self._test_arg_valid(csv.reader, []) | |
| self.assertRaises(OSError, csv.reader, BadIterable()) | |
| def test_writer_arg_valid(self): | |
| self._test_arg_valid(csv.writer, StringIO()) | |
| class BadWriter: | |
| @property | |
| def write(self): | |
| raise OSError | |
| self.assertRaises(OSError, csv.writer, BadWriter()) | |
| def _test_default_attrs(self, ctor, *args): | |
| obj = ctor(*args) | |
| # Check defaults | |
| self.assertEqual(obj.dialect.delimiter, ',') | |
| self.assertIs(obj.dialect.doublequote, True) | |
| self.assertEqual(obj.dialect.escapechar, None) | |
| self.assertEqual(obj.dialect.lineterminator, "\r\n") | |
| self.assertEqual(obj.dialect.quotechar, '"') | |
| self.assertEqual(obj.dialect.quoting, csv.QUOTE_MINIMAL) | |
| self.assertIs(obj.dialect.skipinitialspace, False) | |
| self.assertIs(obj.dialect.strict, False) | |
| # Try deleting or changing attributes (they are read-only) | |
| self.assertRaises(AttributeError, delattr, obj.dialect, 'delimiter') | |
| self.assertRaises(AttributeError, setattr, obj.dialect, 'delimiter', ':') | |
| self.assertRaises(AttributeError, delattr, obj.dialect, 'quoting') | |
| self.assertRaises(AttributeError, setattr, obj.dialect, | |
| 'quoting', None) | |
| def test_reader_attrs(self): | |
| self._test_default_attrs(csv.reader, []) | |
| def test_writer_attrs(self): | |
| self._test_default_attrs(csv.writer, StringIO()) | |
| def _test_kw_attrs(self, ctor, *args): | |
| # Now try with alternate options | |
| kwargs = dict(delimiter=':', doublequote=False, escapechar='\\', | |
| lineterminator='\r', quotechar='*', | |
| quoting=csv.QUOTE_NONE, skipinitialspace=True, | |
| strict=True) | |
| obj = ctor(*args, **kwargs) | |
| self.assertEqual(obj.dialect.delimiter, ':') | |
| self.assertIs(obj.dialect.doublequote, False) | |
| self.assertEqual(obj.dialect.escapechar, '\\') | |
| self.assertEqual(obj.dialect.lineterminator, "\r") | |
| self.assertEqual(obj.dialect.quotechar, '*') | |
| self.assertEqual(obj.dialect.quoting, csv.QUOTE_NONE) | |
| self.assertIs(obj.dialect.skipinitialspace, True) | |
| self.assertIs(obj.dialect.strict, True) | |
| def test_reader_kw_attrs(self): | |
| self._test_kw_attrs(csv.reader, []) | |
| def test_writer_kw_attrs(self): | |
| self._test_kw_attrs(csv.writer, StringIO()) | |
| def _test_dialect_attrs(self, ctor, *args): | |
| # Now try with dialect-derived options | |
| class dialect: | |
| delimiter='-' | |
| doublequote=False | |
| escapechar='^' | |
| lineterminator='$' | |
| quotechar='#' | |
| quoting=csv.QUOTE_ALL | |
| skipinitialspace=True | |
| strict=False | |
| args = args + (dialect,) | |
| obj = ctor(*args) | |
| self.assertEqual(obj.dialect.delimiter, '-') | |
| self.assertIs(obj.dialect.doublequote, False) | |
| self.assertEqual(obj.dialect.escapechar, '^') | |
| self.assertEqual(obj.dialect.lineterminator, "$") | |
| self.assertEqual(obj.dialect.quotechar, '#') | |
| self.assertEqual(obj.dialect.quoting, csv.QUOTE_ALL) | |
| self.assertIs(obj.dialect.skipinitialspace, True) | |
| self.assertIs(obj.dialect.strict, False) | |
| def test_reader_dialect_attrs(self): | |
| self._test_dialect_attrs(csv.reader, []) | |
| def test_writer_dialect_attrs(self): | |
| self._test_dialect_attrs(csv.writer, StringIO()) | |
| def _write_test(self, fields, expect, **kwargs): | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| writer = csv.writer(fileobj, **kwargs) | |
| writer.writerow(fields) | |
| fileobj.seek(0) | |
| self.assertEqual(fileobj.read(), | |
| expect + writer.dialect.lineterminator) | |
| def _write_error_test(self, exc, fields, **kwargs): | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| writer = csv.writer(fileobj, **kwargs) | |
| with self.assertRaises(exc): | |
| writer.writerow(fields) | |
| fileobj.seek(0) | |
| self.assertEqual(fileobj.read(), '') | |
| def test_write_arg_valid(self): | |
| self._write_error_test(csv.Error, None) | |
| # Check that exceptions are passed up the chain | |
| self._write_error_test(OSError, BadIterable()) | |
| class BadList: | |
| def __len__(self): | |
| return 10 | |
| def __getitem__(self, i): | |
| if i > 2: | |
| raise OSError | |
| self._write_error_test(OSError, BadList()) | |
| class BadItem: | |
| def __str__(self): | |
| raise OSError | |
| self._write_error_test(OSError, [BadItem()]) | |
| def test_write_bigfield(self): | |
| # This exercises the buffer realloc functionality | |
| bigstring = 'X' * 50000 | |
| self._write_test([bigstring,bigstring], '%s,%s' % \ | |
| (bigstring, bigstring)) | |
| def test_write_quoting(self): | |
| self._write_test(['a',1,'p,q'], 'a,1,"p,q"') | |
| self._write_error_test(csv.Error, ['a',1,'p,q'], | |
| quoting = csv.QUOTE_NONE) | |
| self._write_test(['a',1,'p,q'], 'a,1,"p,q"', | |
| quoting = csv.QUOTE_MINIMAL) | |
| self._write_test(['a',1,'p,q'], '"a",1,"p,q"', | |
| quoting = csv.QUOTE_NONNUMERIC) | |
| self._write_test(['a',1,'p,q'], '"a","1","p,q"', | |
| quoting = csv.QUOTE_ALL) | |
| self._write_test(['a\nb',1], '"a\nb","1"', | |
| quoting = csv.QUOTE_ALL) | |
| self._write_test(['a','',None,1], '"a","",,1', | |
| quoting = csv.QUOTE_STRINGS) | |
| self._write_test(['a','',None,1], '"a","",,"1"', | |
| quoting = csv.QUOTE_NOTNULL) | |
| # FULLWIDTH QUOTATION MARK | |
| self._write_test(['a', 1, 'p,q', 'r＂s', 'x！y'], | |
| 'a,1,＂p,q＂,＂r＂＂s＂,x！y', | |
| quotechar='＂') | |
| def test_write_delimiter(self): | |
| self._write_test(['a', 1, 'p,q', 'x;y'], 'a,1,"p,q",x;y') | |
| self._write_test(['a', 1, 'p;q', 'x,y'], 'a;1;"p;q";x,y', delimiter=';') | |
| self._write_test(['a', 1, 'p\0q', 'x,y'], 'a\x001\0"p\0q"\0x,y', | |
| delimiter='\0') | |
| self._write_test(['a', 1, 'p🍌q', 'x🍍y'], 'a🍌1🍌"p🍌q"🍌x🍍y', | |
| delimiter='🍌') | |
| def test_write_escape(self): | |
| self._write_test(['a',1,'p,q'], 'a,1,"p,q"', | |
| escapechar='\\') | |
| self._write_error_test(csv.Error, ['a',1,'p,"q"'], | |
| escapechar=None, doublequote=False) | |
| self._write_test(['a',1,'p,"q"'], 'a,1,"p,\\"q\\""', | |
| escapechar='\\', doublequote = False) | |
| self._write_test(['"'], '""""', | |
| escapechar='\\', quoting = csv.QUOTE_MINIMAL) | |
| self._write_test(['"'], '\\"', | |
| escapechar='\\', quoting = csv.QUOTE_MINIMAL, | |
| doublequote = False) | |
| self._write_test(['"'], '\\"', | |
| escapechar='\\', quoting = csv.QUOTE_NONE) | |
| self._write_test(['a',1,'p,q'], 'a,1,p\\,q', | |
| escapechar='\\', quoting = csv.QUOTE_NONE) | |
| self._write_test(['\\', 'a'], '\\\\,a', | |
| escapechar='\\', quoting=csv.QUOTE_NONE) | |
| self._write_test(['\\', 'a'], '\\\\,a', | |
| escapechar='\\', quoting=csv.QUOTE_MINIMAL) | |
| self._write_test(['\\', 'a'], '"\\\\","a"', | |
| escapechar='\\', quoting=csv.QUOTE_ALL) | |
| self._write_test(['\\ ', 'a'], '\\\\ ,a', | |
| escapechar='\\', quoting=csv.QUOTE_MINIMAL) | |
| self._write_test(['\\,', 'a'], '\\\\\\,,a', | |
| escapechar='\\', quoting=csv.QUOTE_NONE) | |
| self._write_test([',\\', 'a'], '",\\\\",a', | |
| escapechar='\\', quoting=csv.QUOTE_MINIMAL) | |
| self._write_test(['C\\', '6', '7', 'X"'], 'C\\\\,6,7,"X"""', | |
| escapechar='\\', quoting=csv.QUOTE_MINIMAL) | |
| # SYMBOL FOR ESCAPE | |
| self._write_test(['a', 1, 'p,q', 'r\u241bs', 'x\u241ay'], | |
| 'a,1,p\u241b,q,r\u241b\u241bs,x\u241ay', | |
| escapechar='\u241b', quoting=csv.QUOTE_NONE) | |
| def test_write_lineterminator(self): | |
| for lineterminator in ('\r\n', '\n', '\r', '!@#', '\0', | |
| '\x85', '\u2028', '\U0001f600'): | |
| with self.subTest(lineterminator=lineterminator): | |
| with StringIO() as sio: | |
| writer = csv.writer(sio, lineterminator=lineterminator) | |
| writer.writerow(['a', 'b']) | |
| writer.writerow([1, 2]) | |
| writer.writerow(['\r', '\n']) | |
| writer.writerow([f'a{lineterminator[-1]}b', 'c']) | |
| self.assertEqual(sio.getvalue(), | |
| f'a,b{lineterminator}' | |
| f'1,2{lineterminator}' | |
| f'"\r","\n"{lineterminator}' | |
| f'"a{lineterminator[-1]}b",c{lineterminator}') | |
| def test_write_iterable(self): | |
| self._write_test(iter(['a', 1, 'p,q']), 'a,1,"p,q"') | |
| self._write_test(iter(['a', 1, None]), 'a,1,') | |
| self._write_test(iter([]), '') | |
| self._write_test(iter([None]), '""') | |
| self._write_error_test(csv.Error, iter([None]), quoting=csv.QUOTE_NONE) | |
| self._write_test(iter([None, None]), ',') | |
| def test_writerows(self): | |
| class BrokenFile: | |
| def write(self, buf): | |
| raise OSError | |
| writer = csv.writer(BrokenFile()) | |
| self.assertRaises(OSError, writer.writerows, [['a']]) | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| writer = csv.writer(fileobj) | |
| self.assertRaises(TypeError, writer.writerows, None) | |
| writer.writerows([['a', 'b'], ['c', 'd']]) | |
| fileobj.seek(0) | |
| self.assertEqual(fileobj.read(), "a,b\r\nc,d\r\n") | |
| def test_writerows_with_none(self): | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| writer = csv.writer(fileobj) | |
| writer.writerows([['a', None], [None, 'd']]) | |
| fileobj.seek(0) | |
| self.assertEqual(fileobj.read(), "a,\r\n,d\r\n") | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| writer = csv.writer(fileobj) | |
| writer.writerows([[None], ['a']]) | |
| fileobj.seek(0) | |
| self.assertEqual(fileobj.read(), '""\r\na\r\n') | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| writer = csv.writer(fileobj) | |
| writer.writerows([['a'], [None]]) | |
| fileobj.seek(0) | |
| self.assertEqual(fileobj.read(), 'a\r\n""\r\n') | |
| def test_write_empty_fields(self): | |
| self._write_test((), '') | |
| self._write_test([''], '""') | |
| self._write_error_test(csv.Error, [''], quoting=csv.QUOTE_NONE) | |
| self._write_test([''], '""', quoting=csv.QUOTE_STRINGS) | |
| self._write_test([''], '""', quoting=csv.QUOTE_NOTNULL) | |
| self._write_test([None], '""') | |
| self._write_error_test(csv.Error, [None], quoting=csv.QUOTE_NONE) | |
| self._write_error_test(csv.Error, [None], quoting=csv.QUOTE_STRINGS) | |
| self._write_error_test(csv.Error, [None], quoting=csv.QUOTE_NOTNULL) | |
| self._write_test(['', ''], ',') | |
| self._write_test([None, None], ',') | |
| def test_write_empty_fields_space_delimiter(self): | |
| self._write_test([''], '""', delimiter=' ', skipinitialspace=False) | |
| self._write_test([''], '""', delimiter=' ', skipinitialspace=True) | |
| self._write_test([None], '""', delimiter=' ', skipinitialspace=False) | |
| self._write_test([None], '""', delimiter=' ', skipinitialspace=True) | |
| self._write_test(['', ''], ' ', delimiter=' ', skipinitialspace=False) | |
| self._write_test(['', ''], '"" ""', delimiter=' ', skipinitialspace=True) | |
| self._write_test([None, None], ' ', delimiter=' ', skipinitialspace=False) | |
| self._write_test([None, None], '"" ""', delimiter=' ', skipinitialspace=True) | |
| self._write_test(['', ''], ' ', delimiter=' ', skipinitialspace=False, | |
| quoting=csv.QUOTE_NONE) | |
| self._write_error_test(csv.Error, ['', ''], | |
| delimiter=' ', skipinitialspace=True, | |
| quoting=csv.QUOTE_NONE) | |
| for quoting in csv.QUOTE_STRINGS, csv.QUOTE_NOTNULL: | |
| self._write_test(['', ''], '"" ""', delimiter=' ', skipinitialspace=False, | |
| quoting=quoting) | |
| self._write_test(['', ''], '"" ""', delimiter=' ', skipinitialspace=True, | |
| quoting=quoting) | |
| for quoting in csv.QUOTE_NONE, csv.QUOTE_STRINGS, csv.QUOTE_NOTNULL: | |
| self._write_test([None, None], ' ', delimiter=' ', skipinitialspace=False, | |
| quoting=quoting) | |
| self._write_error_test(csv.Error, [None, None], | |
| delimiter=' ', skipinitialspace=True, | |
| quoting=quoting) | |
| def test_writerows_errors(self): | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| writer = csv.writer(fileobj) | |
| self.assertRaises(TypeError, writer.writerows, None) | |
| self.assertRaises(OSError, writer.writerows, BadIterable()) | |
| def _read_test(self, input, expect, **kwargs): | |
| reader = csv.reader(input, **kwargs) | |
| result = list(reader) | |
| self.assertEqual(result, expect) | |
| def test_read_oddinputs(self): | |
| self._read_test([], []) | |
| self._read_test([''], [[]]) | |
| self.assertRaises(csv.Error, self._read_test, | |
| ['"ab"c'], None, strict = 1) | |
| self._read_test(['"ab"c'], [['abc']], doublequote = 0) | |
| self.assertRaises(csv.Error, self._read_test, | |
| [b'abc'], None) | |
| def test_read_eol(self): | |
| self._read_test(['a,b', 'c,d'], [['a','b'], ['c','d']]) | |
| self._read_test(['a,b\n', 'c,d\n'], [['a','b'], ['c','d']]) | |
| self._read_test(['a,b\r\n', 'c,d\r\n'], [['a','b'], ['c','d']]) | |
| self._read_test(['a,b\r', 'c,d\r'], [['a','b'], ['c','d']]) | |
| errmsg = "with newline=''" | |
| with self.assertRaisesRegex(csv.Error, errmsg): | |
| next(csv.reader(['a,b\rc,d'])) | |
| with self.assertRaisesRegex(csv.Error, errmsg): | |
| next(csv.reader(['a,b\nc,d'])) | |
| with self.assertRaisesRegex(csv.Error, errmsg): | |
| next(csv.reader(['a,b\r\nc,d'])) | |
| def test_read_eof(self): | |
| self._read_test(['a,"'], [['a', '']]) | |
| self._read_test(['"a'], [['a']]) | |
| self._read_test(['^'], [['\n']], escapechar='^') | |
| self.assertRaises(csv.Error, self._read_test, ['a,"'], [], strict=True) | |
| self.assertRaises(csv.Error, self._read_test, ['"a'], [], strict=True) | |
| self.assertRaises(csv.Error, self._read_test, | |
| ['^'], [], escapechar='^', strict=True) | |
| def test_read_nul(self): | |
| self._read_test(['\0'], [['\0']]) | |
| self._read_test(['a,\0b,c'], [['a', '\0b', 'c']]) | |
| self._read_test(['a,b\0,c'], [['a', 'b\0', 'c']]) | |
| self._read_test(['a,b\\\0,c'], [['a', 'b\0', 'c']], escapechar='\\') | |
| self._read_test(['a,"\0b",c'], [['a', '\0b', 'c']]) | |
| def test_read_delimiter(self): | |
| self._read_test(['a,b,c'], [['a', 'b', 'c']]) | |
| self._read_test(['a;b;c'], [['a', 'b', 'c']], delimiter=';') | |
| self._read_test(['a\0b\0c'], [['a', 'b', 'c']], delimiter='\0') | |
| def test_read_escape(self): | |
| self._read_test(['a,\\b,c'], [['a', 'b', 'c']], escapechar='\\') | |
| self._read_test(['a,b\\,c'], [['a', 'b,c']], escapechar='\\') | |
| self._read_test(['a,"b\\,c"'], [['a', 'b,c']], escapechar='\\') | |
| self._read_test(['a,"b,\\c"'], [['a', 'b,c']], escapechar='\\') | |
| self._read_test(['a,"b,c\\""'], [['a', 'b,c"']], escapechar='\\') | |
| self._read_test(['a,"b,c"\\'], [['a', 'b,c\\']], escapechar='\\') | |
| self._read_test(['a,^b,c'], [['a', 'b', 'c']], escapechar='^') | |
| self._read_test(['a,\0b,c'], [['a', 'b', 'c']], escapechar='\0') | |
| self._read_test(['a,\\b,c'], [['a', '\\b', 'c']], escapechar=None) | |
| self._read_test(['a,\\b,c'], [['a', '\\b', 'c']]) | |
| def test_read_quoting(self): | |
| self._read_test(['1,",3,",5'], [['1', ',3,', '5']]) | |
| self._read_test(['1,",3,",5'], [['1', '"', '3', '"', '5']], | |
| quotechar=None, escapechar='\\') | |
| self._read_test(['1,",3,",5'], [['1', '"', '3', '"', '5']], | |
| quoting=csv.QUOTE_NONE, escapechar='\\') | |
| # will this fail where locale uses comma for decimals? | |
| self._read_test([',3,"5",7.3, 9'], [['', 3, '5', 7.3, 9]], | |
| quoting=csv.QUOTE_NONNUMERIC) | |
| self._read_test([',3,"5",7.3, 9'], [[None, '3', '5', '7.3', ' 9']], | |
| quoting=csv.QUOTE_NOTNULL) | |
| self._read_test([',3,"5",7.3, 9'], [[None, 3, '5', 7.3, 9]], | |
| quoting=csv.QUOTE_STRINGS) | |
| self._read_test([',,"",'], [['', '', '', '']]) | |
| self._read_test([',,"",'], [['', '', '', '']], | |
| quoting=csv.QUOTE_NONNUMERIC) | |
| self._read_test([',,"",'], [[None, None, '', None]], | |
| quoting=csv.QUOTE_NOTNULL) | |
| self._read_test([',,"",'], [[None, None, '', None]], | |
| quoting=csv.QUOTE_STRINGS) | |
| self._read_test(['"a\nb", 7'], [['a\nb', ' 7']]) | |
| self.assertRaises(ValueError, self._read_test, | |
| ['abc,3'], [[]], | |
| quoting=csv.QUOTE_NONNUMERIC) | |
| self.assertRaises(ValueError, self._read_test, | |
| ['abc,3'], [[]], | |
| quoting=csv.QUOTE_STRINGS) | |
| self._read_test(['1,@,3,@,5'], [['1', ',3,', '5']], quotechar='@') | |
| self._read_test(['1,\0,3,\0,5'], [['1', ',3,', '5']], quotechar='\0') | |
| self._read_test(['1\\.5,\\.5,.5'], [[1.5, 0.5, 0.5]], | |
| quoting=csv.QUOTE_NONNUMERIC, escapechar='\\') | |
| self._read_test(['1\\.5,\\.5,"\\.5"'], [[1.5, 0.5, ".5"]], | |
| quoting=csv.QUOTE_STRINGS, escapechar='\\') | |
| def test_read_skipinitialspace(self): | |
| self._read_test(['no space, space, spaces,\ttab'], | |
| [['no space', 'space', 'spaces', '\ttab']], | |
| skipinitialspace=True) | |
| self._read_test([' , , '], | |
| [['', '', '']], | |
| skipinitialspace=True) | |
| self._read_test([' , , '], | |
| [[None, None, None]], | |
| skipinitialspace=True, quoting=csv.QUOTE_NOTNULL) | |
| self._read_test([' , , '], | |
| [[None, None, None]], | |
| skipinitialspace=True, quoting=csv.QUOTE_STRINGS) | |
| def test_read_space_delimiter(self): | |
| self._read_test(['a b', ' a ', ' ', ''], | |
| [['a', '', '', 'b'], ['', '', 'a', '', ''], ['', '', ''], []], | |
| delimiter=' ', skipinitialspace=False) | |
| self._read_test(['a b', ' a ', ' ', ''], | |
| [['a', 'b'], ['a', ''], [''], []], | |
| delimiter=' ', skipinitialspace=True) | |
| def test_read_bigfield(self): | |
| # This exercises the buffer realloc functionality and field size | |
| # limits. | |
| limit = csv.field_size_limit() | |
| try: | |
| size = 50000 | |
| bigstring = 'X' * size | |
| bigline = '%s,%s' % (bigstring, bigstring) | |
| self._read_test([bigline], [[bigstring, bigstring]]) | |
| csv.field_size_limit(size) | |
| self._read_test([bigline], [[bigstring, bigstring]]) | |
| self.assertEqual(csv.field_size_limit(), size) | |
| csv.field_size_limit(size-1) | |
| self.assertRaises(csv.Error, self._read_test, [bigline], []) | |
| self.assertRaises(TypeError, csv.field_size_limit, None) | |
| self.assertRaises(TypeError, csv.field_size_limit, 1, None) | |
| finally: | |
| csv.field_size_limit(limit) | |
| def test_read_linenum(self): | |
| r = csv.reader(['line,1', 'line,2', 'line,3']) | |
| self.assertEqual(r.line_num, 0) | |
| next(r) | |
| self.assertEqual(r.line_num, 1) | |
| next(r) | |
| self.assertEqual(r.line_num, 2) | |
| next(r) | |
| self.assertEqual(r.line_num, 3) | |
| self.assertRaises(StopIteration, next, r) | |
| self.assertEqual(r.line_num, 3) | |
| def test_roundtrip_quoteed_newlines(self): | |
| rows = [ | |
| ['\na', 'b\nc', 'd\n'], | |
| ['\re', 'f\rg', 'h\r'], | |
| ['\r\ni', 'j\r\nk', 'l\r\n'], | |
| ['\n\rm', 'n\n\ro', 'p\n\r'], | |
| ['\r\rq', 'r\r\rs', 't\r\r'], | |
| ['\n\nu', 'v\n\nw', 'x\n\n'], | |
| ] | |
| for lineterminator in '\r\n', '\n', '\r': | |
| with self.subTest(lineterminator=lineterminator): | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| writer = csv.writer(fileobj, lineterminator=lineterminator) | |
| writer.writerows(rows) | |
| fileobj.seek(0) | |
| for i, row in enumerate(csv.reader(fileobj)): | |
| self.assertEqual(row, rows[i]) | |
| def test_roundtrip_escaped_unquoted_newlines(self): | |
| rows = [ | |
| ['\na', 'b\nc', 'd\n'], | |
| ['\re', 'f\rg', 'h\r'], | |
| ['\r\ni', 'j\r\nk', 'l\r\n'], | |
| ['\n\rm', 'n\n\ro', 'p\n\r'], | |
| ['\r\rq', 'r\r\rs', 't\r\r'], | |
| ['\n\nu', 'v\n\nw', 'x\n\n'], | |
| ] | |
| for lineterminator in '\r\n', '\n', '\r': | |
| with self.subTest(lineterminator=lineterminator): | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| writer = csv.writer(fileobj, lineterminator=lineterminator, | |
| quoting=csv.QUOTE_NONE, escapechar="\\") | |
| writer.writerows(rows) | |
| fileobj.seek(0) | |
| for i, row in enumerate(csv.reader(fileobj, | |
| quoting=csv.QUOTE_NONE, | |
| escapechar="\\")): | |
| self.assertEqual(row, rows[i]) | |
| def test_reader_reentrant_iterator(self): | |
| # gh-145105: re-entering the reader from the iterator must not crash. | |
| class ReentrantIter: | |
| def __init__(self): | |
| self.reader = None | |
| self.n = 0 | |
| def __iter__(self): | |
| return self | |
| def __next__(self): | |
| self.n += 1 | |
| if self.n == 1: | |
| try: | |
| next(self.reader) | |
| except StopIteration: | |
| pass | |
| return "a,b" | |
| if self.n == 2: | |
| return "x" | |
| raise StopIteration | |
| it = ReentrantIter() | |
| reader = csv.reader(it) | |
| it.reader = reader | |
| with self.assertRaises(csv.Error): | |
| next(reader) | |
| class TestDialectRegistry(unittest.TestCase): | |
| def test_registry_badargs(self): | |
| self.assertRaises(TypeError, csv.list_dialects, None) | |
| self.assertRaises(TypeError, csv.get_dialect) | |
| self.assertRaises(csv.Error, csv.get_dialect, None) | |
| self.assertRaises(csv.Error, csv.get_dialect, "nonesuch") | |
| self.assertRaises(TypeError, csv.unregister_dialect) | |
| self.assertRaises(csv.Error, csv.unregister_dialect, None) | |
| self.assertRaises(csv.Error, csv.unregister_dialect, "nonesuch") | |
| self.assertRaises(TypeError, csv.register_dialect, None) | |
| self.assertRaises(TypeError, csv.register_dialect, None, None) | |
| self.assertRaises(TypeError, csv.register_dialect, "nonesuch", 0, 0) | |
| self.assertRaises(TypeError, csv.register_dialect, "nonesuch", | |
| badargument=None) | |
| self.assertRaises(TypeError, csv.register_dialect, "nonesuch", | |
| quoting=None) | |
| self.assertRaises(TypeError, csv.register_dialect, []) | |
| def test_registry(self): | |
| class myexceltsv(csv.excel): | |
| delimiter = "\t" | |
| name = "myexceltsv" | |
| expected_dialects = csv.list_dialects() + [name] | |
| expected_dialects.sort() | |
| csv.register_dialect(name, myexceltsv) | |
| self.addCleanup(csv.unregister_dialect, name) | |
| self.assertEqual(csv.get_dialect(name).delimiter, '\t') | |
| got_dialects = sorted(csv.list_dialects()) | |
| self.assertEqual(expected_dialects, got_dialects) | |
| def test_register_kwargs(self): | |
| name = 'fedcba' | |
| csv.register_dialect(name, delimiter=';') | |
| self.addCleanup(csv.unregister_dialect, name) | |
| self.assertEqual(csv.get_dialect(name).delimiter, ';') | |
| self.assertEqual([['X', 'Y', 'Z']], list(csv.reader(['X;Y;Z'], name))) | |
| def test_register_kwargs_override(self): | |
| class mydialect(csv.Dialect): | |
| delimiter = "\t" | |
| quotechar = '"' | |
| doublequote = True | |
| skipinitialspace = False | |
| lineterminator = '\r\n' | |
| quoting = csv.QUOTE_MINIMAL | |
| name = 'test_dialect' | |
| csv.register_dialect(name, mydialect, | |
| delimiter=';', | |
| quotechar="'", | |
| doublequote=False, | |
| skipinitialspace=True, | |
| lineterminator='\n', | |
| quoting=csv.QUOTE_ALL) | |
| self.addCleanup(csv.unregister_dialect, name) | |
| # Ensure that kwargs do override attributes of a dialect class: | |
| dialect = csv.get_dialect(name) | |
| self.assertEqual(dialect.delimiter, ';') | |
| self.assertEqual(dialect.quotechar, "'") | |
| self.assertEqual(dialect.doublequote, False) | |
| self.assertEqual(dialect.skipinitialspace, True) | |
| self.assertEqual(dialect.lineterminator, '\n') | |
| self.assertEqual(dialect.quoting, csv.QUOTE_ALL) | |
| def test_incomplete_dialect(self): | |
| class myexceltsv(csv.Dialect): | |
| delimiter = "\t" | |
| self.assertRaises(csv.Error, myexceltsv) | |
| def test_space_dialect(self): | |
| class space(csv.excel): | |
| delimiter = " " | |
| quoting = csv.QUOTE_NONE | |
| escapechar = "\\" | |
| with TemporaryFile("w+", encoding="utf-8") as fileobj: | |
| fileobj.write("abc def\nc1ccccc1 benzene\n") | |
| fileobj.seek(0) | |
| reader = csv.reader(fileobj, dialect=space()) | |
| self.assertEqual(next(reader), ["abc", "", "", "def"]) | |
| self.assertEqual(next(reader), ["c1ccccc1", "benzene"]) | |
| def compare_dialect_123(self, expected, *writeargs, **kwwriteargs): | |
| with TemporaryFile("w+", newline='', encoding="utf-8") as fileobj: | |
| writer = csv.writer(fileobj, *writeargs, **kwwriteargs) | |
| writer.writerow([1,2,3]) | |
| fileobj.seek(0) | |
| self.assertEqual(fileobj.read(), expected) | |
| def test_dialect_apply(self): | |
| class testA(csv.excel): | |
| delimiter = "\t" | |
| class testB(csv.excel): | |
| delimiter = ":" | |
| class testC(csv.excel): | |
| delimiter = "|" | |
| class testUni(csv.excel): | |
| delimiter = "\u039B" | |
| class unspecified(): | |
| # A class to pass as dialect but with no dialect attributes. | |
| pass | |
| csv.register_dialect('testC', testC) | |
| try: | |
| self.compare_dialect_123("1,2,3\r\n") | |
| self.compare_dialect_123("1,2,3\r\n", dialect=None) | |
| self.compare_dialect_123("1,2,3\r\n", dialect=unspecified) | |
| self.compare_dialect_123("1\t2\t3\r\n", testA) | |
| self.compare_dialect_123("1:2:3\r\n", dialect=testB()) | |
| self.compare_dialect_123("1|2|3\r\n", dialect='testC') | |
| self.compare_dialect_123("1;2;3\r\n", dialect=testA, | |
| delimiter=';') | |
| self.compare_dialect_123("1\u039B2\u039B3\r\n", | |
| dialect=testUni) | |
| finally: | |
| csv.unregister_dialect('testC') | |
| def test_copy(self): | |
| for name in csv.list_dialects(): | |
| dialect = csv.get_dialect(name) | |
| self.assertRaises(TypeError, copy.copy, dialect) | |
| def test_replace(self): | |
| dialect = csv.get_dialect('excel') | |
| new = copy.replace(dialect, delimiter=';', strict=True) | |
| self.assertIsInstance(new, type(dialect)) | |
| self.assertEqual(new.delimiter, ';') | |
| self.assertTrue(new.strict) | |
| # Not replaced parameters are inherited from the original dialect. | |
| self.assertEqual(new.quotechar, dialect.quotechar) | |
| self.assertEqual(new.escapechar, dialect.escapechar) | |
| self.assertEqual(new.lineterminator, dialect.lineterminator) | |
| self.assertEqual(new.quoting, dialect.quoting) | |
| self.assertEqual(new.doublequote, dialect.doublequote) | |
| self.assertEqual(new.skipinitialspace, dialect.skipinitialspace) | |
| # The original dialect is left unchanged. | |
| self.assertEqual(dialect.delimiter, ',') | |
| self.assertFalse(dialect.strict) | |
| self.assertEqual(list(csv.reader(['a;b'], new)), [['a', 'b']]) | |
| self.assertIs(copy.replace(dialect), dialect) | |
| self.assertRaises(TypeError, copy.replace, dialect, delimeter=';') | |
| self.assertRaises(TypeError, copy.replace, dialect, delimiter=';;') | |
| self.assertRaises(TypeError, dialect.__replace__, dialect) | |
| def test_replace_dialect_subclass(self): | |
| class mydialect(csv.Dialect): | |
| delimiter = ";" | |
| quotechar = '"' | |
| doublequote = False | |
| skipinitialspace = True | |
| lineterminator = '\r\n' | |
| quoting = csv.QUOTE_ALL | |
| dialect = mydialect() | |
| new = copy.replace(dialect, delimiter=':', quoting=csv.QUOTE_MINIMAL) | |
| self.assertIsInstance(new, mydialect) | |
| self.assertEqual(new.delimiter, ':') | |
| self.assertEqual(new.quoting, csv.QUOTE_MINIMAL) | |
| # Not replaced parameters are inherited from the original dialect. | |
| self.assertEqual(new.quotechar, '"') | |
| self.assertEqual(new.escapechar, None) | |
| self.assertEqual(new.lineterminator, '\r\n') | |
| self.assertFalse(new.doublequote) | |
| self.assertTrue(new.skipinitialspace) | |
| # The original dialect is left unchanged. | |
| self.assertEqual(dialect.delimiter, ';') | |
| self.assertEqual(dialect.quoting, csv.QUOTE_ALL) | |
| self.assertEqual(list(csv.reader(['a:b'], new)), [['a', 'b']]) | |
| # "strict" is supported even if it is not set on the class. | |
| self.assertTrue(copy.replace(dialect, strict=True).strict) | |
| with self.assertRaises(csv.Error): | |
| copy.replace(dialect, delimiter='::') | |
| with self.assertRaisesRegex(TypeError, "'delimeter'"): | |
| copy.replace(dialect, delimeter=':') | |
| def test_pickle(self): | |
| for name in csv.list_dialects(): | |
| dialect = csv.get_dialect(name) | |
| for proto in range(pickle.HIGHEST_PROTOCOL + 1): | |
| self.assertRaises(TypeError, pickle.dumps, dialect, proto) | |
| class TestCsvBase(unittest.TestCase): | |
| def readerAssertEqual(self, input, expected_result): | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| fileobj.write(input) | |
| fileobj.seek(0) | |
| reader = csv.reader(fileobj, dialect = self.dialect) | |
| fields = list(reader) | |
| self.assertEqual(fields, expected_result) | |
| def writerAssertEqual(self, input, expected_result): | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| writer = csv.writer(fileobj, dialect = self.dialect) | |
| writer.writerows(input) | |
| fileobj.seek(0) | |
| self.assertEqual(fileobj.read(), expected_result) | |
| class TestDialectExcel(TestCsvBase): | |
| dialect = 'excel' | |
| def test_single(self): | |
| self.readerAssertEqual('abc', [['abc']]) | |
| def test_simple(self): | |
| self.readerAssertEqual('1,2,3,4,5', [['1','2','3','4','5']]) | |
| def test_blankline(self): | |
| self.readerAssertEqual('', []) | |
| def test_empty_fields(self): | |
| self.readerAssertEqual(',', [['', '']]) | |
| def test_singlequoted(self): | |
| self.readerAssertEqual('""', [['']]) | |
| def test_singlequoted_left_empty(self): | |
| self.readerAssertEqual('"",', [['','']]) | |
| def test_singlequoted_right_empty(self): | |
| self.readerAssertEqual(',""', [['','']]) | |
| def test_single_quoted_quote(self): | |
| self.readerAssertEqual('""""', [['"']]) | |
| def test_quoted_quotes(self): | |
| self.readerAssertEqual('""""""', [['""']]) | |
| def test_inline_quote(self): | |
| self.readerAssertEqual('a""b', [['a""b']]) | |
| def test_inline_quotes(self): | |
| self.readerAssertEqual('a"b"c', [['a"b"c']]) | |
| def test_quotes_and_more(self): | |
| # Excel would never write a field containing '"a"b', but when | |
| # reading one, it will return 'ab'. | |
| self.readerAssertEqual('"a"b', [['ab']]) | |
| def test_lone_quote(self): | |
| self.readerAssertEqual('a"b', [['a"b']]) | |
| def test_quote_and_quote(self): | |
| # Excel would never write a field containing '"a" "b"', but when | |
| # reading one, it will return 'a "b"'. | |
| self.readerAssertEqual('"a" "b"', [['a "b"']]) | |
| def test_space_and_quote(self): | |
| self.readerAssertEqual(' "a"', [[' "a"']]) | |
| def test_quoted(self): | |
| self.readerAssertEqual('1,2,3,"I think, therefore I am",5,6', | |
| [['1', '2', '3', | |
| 'I think, therefore I am', | |
| '5', '6']]) | |
| def test_quoted_quote(self): | |
| self.readerAssertEqual('1,2,3,"""I see,"" said the blind man","as he picked up his hammer and saw"', | |
| [['1', '2', '3', | |
| '"I see," said the blind man', | |
| 'as he picked up his hammer and saw']]) | |
| def test_quoted_nl(self): | |
| input = '''\ | |
| 1,2,3,"""I see,"" | |
| said the blind man","as he picked up his | |
| hammer and saw" | |
| 9,8,7,6''' | |
| self.readerAssertEqual(input, | |
| [['1', '2', '3', | |
| '"I see,"\nsaid the blind man', | |
| 'as he picked up his\nhammer and saw'], | |
| ['9','8','7','6']]) | |
| def test_dubious_quote(self): | |
| self.readerAssertEqual('12,12,1",', [['12', '12', '1"', '']]) | |
| def test_null(self): | |
| self.writerAssertEqual([], '') | |
| def test_single_writer(self): | |
| self.writerAssertEqual([['abc']], 'abc\r\n') | |
| def test_simple_writer(self): | |
| self.writerAssertEqual([[1, 2, 'abc', 3, 4]], '1,2,abc,3,4\r\n') | |
| def test_quotes(self): | |
| self.writerAssertEqual([[1, 2, 'a"bc"', 3, 4]], '1,2,"a""bc""",3,4\r\n') | |
| def test_quote_fieldsep(self): | |
| self.writerAssertEqual([['abc,def']], '"abc,def"\r\n') | |
| def test_newlines(self): | |
| self.writerAssertEqual([[1, 2, 'a\nbc', 3, 4]], '1,2,"a\nbc",3,4\r\n') | |
| class EscapedExcel(csv.excel): | |
| quoting = csv.QUOTE_NONE | |
| escapechar = '\\' | |
| class TestEscapedExcel(TestCsvBase): | |
| dialect = EscapedExcel() | |
| def test_escape_fieldsep(self): | |
| self.writerAssertEqual([['abc,def']], 'abc\\,def\r\n') | |
| def test_read_escape_fieldsep(self): | |
| self.readerAssertEqual('abc\\,def\r\n', [['abc,def']]) | |
| class TestDialectUnix(TestCsvBase): | |
| dialect = 'unix' | |
| def test_simple_writer(self): | |
| self.writerAssertEqual([[1, 'abc def', 'abc']], '"1","abc def","abc"\n') | |
| def test_simple_reader(self): | |
| self.readerAssertEqual('"1","abc def","abc"\n', [['1', 'abc def', 'abc']]) | |
| class QuotedEscapedExcel(csv.excel): | |
| quoting = csv.QUOTE_NONNUMERIC | |
| escapechar = '\\' | |
| class TestQuotedEscapedExcel(TestCsvBase): | |
| dialect = QuotedEscapedExcel() | |
| def test_write_escape_fieldsep(self): | |
| self.writerAssertEqual([['abc,def']], '"abc,def"\r\n') | |
| def test_read_escape_fieldsep(self): | |
| self.readerAssertEqual('"abc\\,def"\r\n', [['abc,def']]) | |
| class TestDictFields(unittest.TestCase): | |
| ### "long" means the row is longer than the number of fieldnames | |
| ### "short" means there are fewer elements in the row than fieldnames | |
| def test_writeheader_return_value(self): | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| writer = csv.DictWriter(fileobj, fieldnames = ["f1", "f2", "f3"]) | |
| writeheader_return_value = writer.writeheader() | |
| self.assertEqual(writeheader_return_value, 10) | |
| def test_write_simple_dict(self): | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| writer = csv.DictWriter(fileobj, fieldnames = ["f1", "f2", "f3"]) | |
| writer.writeheader() | |
| fileobj.seek(0) | |
| self.assertEqual(fileobj.readline(), "f1,f2,f3\r\n") | |
| writer.writerow({"f1": 10, "f3": "abc"}) | |
| fileobj.seek(0) | |
| fileobj.readline() # header | |
| self.assertEqual(fileobj.read(), "10,,abc\r\n") | |
| def test_write_multiple_dict_rows(self): | |
| fileobj = StringIO() | |
| writer = csv.DictWriter(fileobj, fieldnames=["f1", "f2", "f3"]) | |
| writer.writeheader() | |
| self.assertEqual(fileobj.getvalue(), "f1,f2,f3\r\n") | |
| writer.writerows([{"f1": 1, "f2": "abc", "f3": "f"}, | |
| {"f1": 2, "f2": 5, "f3": "xyz"}]) | |
| self.assertEqual(fileobj.getvalue(), | |
| "f1,f2,f3\r\n1,abc,f\r\n2,5,xyz\r\n") | |
| def test_write_no_fields(self): | |
| fileobj = StringIO() | |
| self.assertRaises(TypeError, csv.DictWriter, fileobj) | |
| def test_write_fields_not_in_fieldnames(self): | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| writer = csv.DictWriter(fileobj, fieldnames = ["f1", "f2", "f3"]) | |
| # Of special note is the non-string key (issue 19449) | |
| with self.assertRaises(ValueError) as cx: | |
| writer.writerow({"f4": 10, "f2": "spam", 1: "abc"}) | |
| exception = str(cx.exception) | |
| self.assertIn("fieldnames", exception) | |
| self.assertIn("'f4'", exception) | |
| self.assertNotIn("'f2'", exception) | |
| self.assertIn("1", exception) | |
| def test_typo_in_extrasaction_raises_error(self): | |
| fileobj = StringIO() | |
| self.assertRaises(ValueError, csv.DictWriter, fileobj, ['f1', 'f2'], | |
| extrasaction="raised") | |
| def test_write_field_not_in_field_names_raise(self): | |
| fileobj = StringIO() | |
| writer = csv.DictWriter(fileobj, ['f1', 'f2'], extrasaction="raise") | |
| dictrow = {'f0': 0, 'f1': 1, 'f2': 2, 'f3': 3} | |
| self.assertRaises(ValueError, csv.DictWriter.writerow, writer, dictrow) | |
| # see bpo-44512 (differently cased 'raise' should not result in 'ignore') | |
| writer = csv.DictWriter(fileobj, ['f1', 'f2'], extrasaction="RAISE") | |
| self.assertRaises(ValueError, csv.DictWriter.writerow, writer, dictrow) | |
| def test_write_field_not_in_field_names_ignore(self): | |
| fileobj = StringIO() | |
| writer = csv.DictWriter(fileobj, ['f1', 'f2'], extrasaction="ignore") | |
| dictrow = {'f0': 0, 'f1': 1, 'f2': 2, 'f3': 3} | |
| csv.DictWriter.writerow(writer, dictrow) | |
| self.assertEqual(fileobj.getvalue(), "1,2\r\n") | |
| # bpo-44512 | |
| writer = csv.DictWriter(fileobj, ['f1', 'f2'], extrasaction="IGNORE") | |
| csv.DictWriter.writerow(writer, dictrow) | |
| def test_dict_reader_fieldnames_accepts_iter(self): | |
| fieldnames = ["a", "b", "c"] | |
| f = StringIO() | |
| reader = csv.DictReader(f, iter(fieldnames)) | |
| self.assertEqual(reader.fieldnames, fieldnames) | |
| def test_dict_reader_fieldnames_accepts_list(self): | |
| fieldnames = ["a", "b", "c"] | |
| f = StringIO() | |
| reader = csv.DictReader(f, fieldnames) | |
| self.assertEqual(reader.fieldnames, fieldnames) | |
| def test_dict_reader_set_fieldnames(self): | |
| fieldnames = ["a", "b", "c"] | |
| f = StringIO() | |
| reader = csv.DictReader(f) | |
| self.assertIsNone(reader.fieldnames) | |
| reader.fieldnames = fieldnames | |
| self.assertEqual(reader.fieldnames, fieldnames) | |
| def test_dict_writer_fieldnames_rejects_iter(self): | |
| fieldnames = ["a", "b", "c"] | |
| f = StringIO() | |
| writer = csv.DictWriter(f, iter(fieldnames)) | |
| self.assertEqual(writer.fieldnames, fieldnames) | |
| def test_dict_writer_fieldnames_accepts_list(self): | |
| fieldnames = ["a", "b", "c"] | |
| f = StringIO() | |
| writer = csv.DictWriter(f, fieldnames) | |
| self.assertEqual(writer.fieldnames, fieldnames) | |
| def test_dict_reader_fieldnames_is_optional(self): | |
| f = StringIO() | |
| reader = csv.DictReader(f, fieldnames=None) | |
| self.assertIsNone(reader.fieldnames) | |
| def test_read_dict_fields(self): | |
| with TemporaryFile("w+", encoding="utf-8") as fileobj: | |
| fileobj.write("1,2,abc\r\n") | |
| fileobj.seek(0) | |
| reader = csv.DictReader(fileobj, | |
| fieldnames=["f1", "f2", "f3"]) | |
| self.assertEqual(next(reader), {"f1": '1', "f2": '2', "f3": 'abc'}) | |
| def test_read_dict_no_fieldnames(self): | |
| with TemporaryFile("w+", encoding="utf-8") as fileobj: | |
| fileobj.write("f1,f2,f3\r\n1,2,abc\r\n") | |
| fileobj.seek(0) | |
| reader = csv.DictReader(fileobj) | |
| self.assertEqual(next(reader), {"f1": '1', "f2": '2', "f3": 'abc'}) | |
| self.assertEqual(reader.fieldnames, ["f1", "f2", "f3"]) | |
| # Two test cases to make sure existing ways of implicitly setting | |
| # fieldnames continue to work. Both arise from discussion in issue3436. | |
| def test_read_dict_fieldnames_from_file(self): | |
| with TemporaryFile("w+", encoding="utf-8") as fileobj: | |
| fileobj.write("f1,f2,f3\r\n1,2,abc\r\n") | |
| fileobj.seek(0) | |
| reader = csv.DictReader(fileobj, | |
| fieldnames=next(csv.reader(fileobj))) | |
| self.assertEqual(reader.fieldnames, ["f1", "f2", "f3"]) | |
| self.assertEqual(next(reader), {"f1": '1', "f2": '2', "f3": 'abc'}) | |
| def test_read_dict_fieldnames_chain(self): | |
| import itertools | |
| with TemporaryFile("w+", encoding="utf-8") as fileobj: | |
| fileobj.write("f1,f2,f3\r\n1,2,abc\r\n") | |
| fileobj.seek(0) | |
| reader = csv.DictReader(fileobj) | |
| first = next(reader) | |
| for row in itertools.chain([first], reader): | |
| self.assertEqual(reader.fieldnames, ["f1", "f2", "f3"]) | |
| self.assertEqual(row, {"f1": '1', "f2": '2', "f3": 'abc'}) | |
| def test_read_long(self): | |
| with TemporaryFile("w+", encoding="utf-8") as fileobj: | |
| fileobj.write("1,2,abc,4,5,6\r\n") | |
| fileobj.seek(0) | |
| reader = csv.DictReader(fileobj, | |
| fieldnames=["f1", "f2"]) | |
| self.assertEqual(next(reader), {"f1": '1', "f2": '2', | |
| None: ["abc", "4", "5", "6"]}) | |
| def test_read_long_with_rest(self): | |
| with TemporaryFile("w+", encoding="utf-8") as fileobj: | |
| fileobj.write("1,2,abc,4,5,6\r\n") | |
| fileobj.seek(0) | |
| reader = csv.DictReader(fileobj, | |
| fieldnames=["f1", "f2"], restkey="_rest") | |
| self.assertEqual(next(reader), {"f1": '1', "f2": '2', | |
| "_rest": ["abc", "4", "5", "6"]}) | |
| def test_read_long_with_rest_no_fieldnames(self): | |
| with TemporaryFile("w+", encoding="utf-8") as fileobj: | |
| fileobj.write("f1,f2\r\n1,2,abc,4,5,6\r\n") | |
| fileobj.seek(0) | |
| reader = csv.DictReader(fileobj, restkey="_rest") | |
| self.assertEqual(reader.fieldnames, ["f1", "f2"]) | |
| self.assertEqual(next(reader), {"f1": '1', "f2": '2', | |
| "_rest": ["abc", "4", "5", "6"]}) | |
| def test_read_short(self): | |
| with TemporaryFile("w+", encoding="utf-8") as fileobj: | |
| fileobj.write("1,2,abc,4,5,6\r\n1,2,abc\r\n") | |
| fileobj.seek(0) | |
| reader = csv.DictReader(fileobj, | |
| fieldnames="1 2 3 4 5 6".split(), | |
| restval="DEFAULT") | |
| self.assertEqual(next(reader), {"1": '1', "2": '2', "3": 'abc', | |
| "4": '4', "5": '5', "6": '6'}) | |
| self.assertEqual(next(reader), {"1": '1', "2": '2', "3": 'abc', | |
| "4": 'DEFAULT', "5": 'DEFAULT', | |
| "6": 'DEFAULT'}) | |
| def test_read_multi(self): | |
| sample = [ | |
| '2147483648,43.0e12,17,abc,def\r\n', | |
| '147483648,43.0e2,17,abc,def\r\n', | |
| '47483648,43.0,170,abc,def\r\n' | |
| ] | |
| reader = csv.DictReader(sample, | |
| fieldnames="i1 float i2 s1 s2".split()) | |
| self.assertEqual(next(reader), {"i1": '2147483648', | |
| "float": '43.0e12', | |
| "i2": '17', | |
| "s1": 'abc', | |
| "s2": 'def'}) | |
| def test_read_with_blanks(self): | |
| reader = csv.DictReader(["1,2,abc,4,5,6\r\n","\r\n", | |
| "1,2,abc,4,5,6\r\n"], | |
| fieldnames="1 2 3 4 5 6".split()) | |
| self.assertEqual(next(reader), {"1": '1', "2": '2', "3": 'abc', | |
| "4": '4', "5": '5', "6": '6'}) | |
| self.assertEqual(next(reader), {"1": '1', "2": '2', "3": 'abc', | |
| "4": '4', "5": '5', "6": '6'}) | |
| def test_read_semi_sep(self): | |
| reader = csv.DictReader(["1;2;abc;4;5;6\r\n"], | |
| fieldnames="1 2 3 4 5 6".split(), | |
| delimiter=';') | |
| self.assertEqual(next(reader), {"1": '1', "2": '2', "3": 'abc', | |
| "4": '4', "5": '5', "6": '6'}) | |
| class TestArrayWrites(unittest.TestCase): | |
| def test_int_write(self): | |
| import array | |
| contents = [(20-i) for i in range(20)] | |
| a = array.array('i', contents) | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| writer = csv.writer(fileobj, dialect="excel") | |
| writer.writerow(a) | |
| expected = ",".join([str(i) for i in a])+"\r\n" | |
| fileobj.seek(0) | |
| self.assertEqual(fileobj.read(), expected) | |
| def test_double_write(self): | |
| import array | |
| contents = [(20-i)*0.1 for i in range(20)] | |
| a = array.array('d', contents) | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| writer = csv.writer(fileobj, dialect="excel") | |
| writer.writerow(a) | |
| expected = ",".join([str(i) for i in a])+"\r\n" | |
| fileobj.seek(0) | |
| self.assertEqual(fileobj.read(), expected) | |
| def test_float_write(self): | |
| import array | |
| contents = [(20-i)*0.1 for i in range(20)] | |
| a = array.array('f', contents) | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| writer = csv.writer(fileobj, dialect="excel") | |
| writer.writerow(a) | |
| expected = ",".join([str(i) for i in a])+"\r\n" | |
| fileobj.seek(0) | |
| self.assertEqual(fileobj.read(), expected) | |
| def test_char_write(self): | |
| import array, string | |
| a = array.array('w', string.ascii_letters) | |
| with TemporaryFile("w+", encoding="utf-8", newline='') as fileobj: | |
| writer = csv.writer(fileobj, dialect="excel") | |
| writer.writerow(a) | |
| expected = ",".join(a)+"\r\n" | |
| fileobj.seek(0) | |
| self.assertEqual(fileobj.read(), expected) | |
| class TestDialectValidity(unittest.TestCase): | |
| def test_quoting(self): | |
| class mydialect(csv.Dialect): | |
| delimiter = ";" | |
| escapechar = '\\' | |
| doublequote = False | |
| skipinitialspace = True | |
| lineterminator = '\r\n' | |
| quoting = csv.QUOTE_NONE | |
| d = mydialect() | |
| self.assertEqual(d.quoting, csv.QUOTE_NONE) | |
| mydialect.quoting = None | |
| self.assertRaises(csv.Error, mydialect) | |
| mydialect.quoting = 42 | |
| with self.assertRaises(csv.Error) as cm: | |
| mydialect() | |
| self.assertEqual(str(cm.exception), | |
| 'bad "quoting" value') | |
| mydialect.doublequote = True | |
| mydialect.quoting = csv.QUOTE_ALL | |
| mydialect.quotechar = '"' | |
| d = mydialect() | |
| self.assertEqual(d.quoting, csv.QUOTE_ALL) | |
| self.assertEqual(d.quotechar, '"') | |
| self.assertTrue(d.doublequote) | |
| mydialect.quotechar = "" | |
| with self.assertRaises(csv.Error) as cm: | |
| mydialect() | |
| self.assertEqual(str(cm.exception), | |
| '"quotechar" must be a unicode character or None, ' | |
| 'not a string of length 0') | |
| mydialect.quotechar = "''" | |
| with self.assertRaises(csv.Error) as cm: | |
| mydialect() | |
| self.assertEqual(str(cm.exception), | |
| '"quotechar" must be a unicode character or None, ' | |
| 'not a string of length 2') | |
| mydialect.quotechar = 4 | |
| with self.assertRaises(csv.Error) as cm: | |
| mydialect() | |
| self.assertEqual(str(cm.exception), | |
| '"quotechar" must be a unicode character or None, ' | |
| 'not int') | |
| def test_delimiter(self): | |
| class mydialect(csv.Dialect): | |
| delimiter = ";" | |
| escapechar = '\\' | |
| doublequote = False | |
| skipinitialspace = True | |
| lineterminator = '\r\n' | |
| quoting = csv.QUOTE_NONE | |
| d = mydialect() | |
| self.assertEqual(d.delimiter, ";") | |
| mydialect.delimiter = ":::" | |
| with self.assertRaises(csv.Error) as cm: | |
| mydialect() | |
| self.assertEqual(str(cm.exception), | |
| '"delimiter" must be a unicode character, ' | |
| 'not a string of length 3') | |
| mydialect.delimiter = "" | |
| with self.assertRaises(csv.Error) as cm: | |
| mydialect() | |
| self.assertEqual(str(cm.exception), | |
| '"delimiter" must be a unicode character, not a string of length 0') | |
| mydialect.delimiter = b"," | |
| with self.assertRaises(csv.Error) as cm: | |
| mydialect() | |
| self.assertEqual(str(cm.exception), | |
| '"delimiter" must be a unicode character, not bytes') | |
| mydialect.delimiter = 4 | |
| with self.assertRaises(csv.Error) as cm: | |
| mydialect() | |
| self.assertEqual(str(cm.exception), | |
| '"delimiter" must be a unicode character, not int') | |
| mydialect.delimiter = None | |
| with self.assertRaises(csv.Error) as cm: | |
| mydialect() | |
| self.assertEqual(str(cm.exception), | |
| '"delimiter" must be a unicode character, not NoneType') | |
| def test_escapechar(self): | |
| class mydialect(csv.Dialect): | |
| delimiter = ";" | |
| escapechar = '\\' | |
| doublequote = False | |
| skipinitialspace = True | |
| lineterminator = '\r\n' | |
| quoting = csv.QUOTE_NONE | |
| d = mydialect() | |
| self.assertEqual(d.escapechar, "\\") | |
| mydialect.escapechar = "" | |
| with self.assertRaises(csv.Error) as cm: | |
| mydialect() | |
| self.assertEqual(str(cm.exception), | |
| '"escapechar" must be a unicode character or None, ' | |
| 'not a string of length 0') | |
| mydialect.escapechar = "**" | |
| with self.assertRaises(csv.Error) as cm: | |
| mydialect() | |
| self.assertEqual(str(cm.exception), | |
| '"escapechar" must be a unicode character or None, ' | |
| 'not a string of length 2') | |
| mydialect.escapechar = b"*" | |
| with self.assertRaises(csv.Error) as cm: | |
| mydialect() | |
| self.assertEqual(str(cm.exception), | |
| '"escapechar" must be a unicode character or None, ' | |
| 'not bytes') | |
| mydialect.escapechar = 4 | |
| with self.assertRaises(csv.Error) as cm: | |
| mydialect() | |
| self.assertEqual(str(cm.exception), | |
| '"escapechar" must be a unicode character or None, ' | |
| 'not int') | |
| def test_lineterminator(self): | |
| class mydialect(csv.Dialect): | |
| delimiter = ";" | |
| escapechar = '\\' | |
| doublequote = False | |
| skipinitialspace = True | |
| lineterminator = '\r\n' | |
| quoting = csv.QUOTE_NONE | |
| d = mydialect() | |
| self.assertEqual(d.lineterminator, '\r\n') | |
| mydialect.lineterminator = ":::" | |
| d = mydialect() | |
| self.assertEqual(d.lineterminator, ":::") | |
| mydialect.lineterminator = 4 | |
| with self.assertRaises(csv.Error) as cm: | |
| mydialect() | |
| self.assertEqual(str(cm.exception), | |
| '"lineterminator" must be a string, not int') | |
| mydialect.lineterminator = None | |
| with self.assertRaises(csv.Error) as cm: | |
| mydialect() | |
| self.assertEqual(str(cm.exception), | |
| '"lineterminator" must be a string, not NoneType') | |
| def test_invalid_chars(self): | |
| def create_invalid(field_name, value, **kwargs): | |
| class mydialect(csv.Dialect): | |
| delimiter = ',' | |
| quoting = csv.QUOTE_ALL | |
| quotechar = '"' | |
| lineterminator = '\r\n' | |
| setattr(mydialect, field_name, value) | |
| for field_name, value in kwargs.items(): | |
| setattr(mydialect, field_name, value) | |
| d = mydialect() | |
| for field_name in ("delimiter", "escapechar", "quotechar"): | |
| with self.subTest(field_name=field_name): | |
| self.assertRaises(csv.Error, create_invalid, field_name, "") | |
| self.assertRaises(csv.Error, create_invalid, field_name, "abc") | |
| self.assertRaises(csv.Error, create_invalid, field_name, b'x') | |
| self.assertRaises(csv.Error, create_invalid, field_name, 5) | |
| self.assertRaises(ValueError, create_invalid, field_name, "\n") | |
| self.assertRaises(ValueError, create_invalid, field_name, "\r") | |
| if field_name != "delimiter": | |
| self.assertRaises(ValueError, create_invalid, field_name, " ", | |
| skipinitialspace=True) | |
| def test_dialect_getattr_non_attribute_error_propagates(self): | |
| # gh-145966: non-AttributeError exceptions raised by __getattr__ | |
| # during dialect attribute lookup must propagate, not be silenced. | |
| class BadDialect: | |
| def __getattr__(self, name): | |
| raise RuntimeError("boom") | |
| with self.assertRaises(RuntimeError): | |
| csv.reader([], dialect=BadDialect()) | |
| with self.assertRaises(RuntimeError): | |
| csv.writer(StringIO(), dialect=BadDialect()) | |
| class TestSniffer(unittest.TestCase): | |
| sample1 = """\ | |
| Harry's, Arlington Heights, IL, 2/1/03, Kimi Hayes | |
| Shark City, Glendale Heights, IL, 12/28/02, Prezence | |
| Tommy's Place, Blue Island, IL, 12/28/02, Blue Sunday/White Crow | |
| Stonecutters Seafood and Chop House, Lemont, IL, 12/19/02, Week Back | |
| """ | |
| sample2 = """\ | |
| 'Harry''s':'Arlington Heights':'IL':'2/1/03':'Kimi Hayes' | |
| 'Shark City':'Glendale Heights':'IL':'12/28/02':'Prezence' | |
| 'Tommy''s Place':'Blue Island':'IL':'12/28/02':'Blue Sunday/White Crow' | |
| 'Stonecutters ''Seafood'' and Chop House':'Lemont':'IL':'12/19/02':'Week Back' | |
| """ | |
| header1 = '''\ | |
| "venue","city","state","date","performers" | |
| ''' | |
| sample3 = '''\ | |
| 05/05/03?05/05/03?05/05/03?05/05/03?05/05/03?05/05/03 | |
| 05/05/03?05/05/03?05/05/03?05/05/03?05/05/03?05/05/03 | |
| 05/05/03?05/05/03?05/05/03?05/05/03?05/05/03?05/05/03 | |
| ''' | |
| sample4 = '''\ | |
| 2147483648;43.0e12;17;abc;def | |
| 147483648;43.0e2;17;abc;def | |
| 47483648;43.0;170;abc;def | |
| ''' | |
| sample5 = "aaa\tbbb\r\nAAA\t\r\nBBB\t\r\n" | |
| sample6 = "a|b|c\r\nd|e|f\r\n" | |
| sample7 = "'a'|'b'|'c'\r\n'd'|e|f\r\n" | |
| # Issue 18155: Use a delimiter that is a special char to regex: | |
| header2 = '''\ | |
| "venue"+"city"+"state"+"date"+"performers" | |
| ''' | |
| sample8 = """\ | |
| Harry's+ Arlington Heights+ IL+ 2/1/03+ Kimi Hayes | |
| Shark City+ Glendale Heights+ IL+ 12/28/02+ Prezence | |
| Tommy's Place+ Blue Island+ IL+ 12/28/02+ Blue Sunday/White Crow | |
| Stonecutters Seafood and Chop House+ Lemont+ IL+ 12/19/02+ Week Back | |
| """ | |
| sample9 = """\ | |
| 'Harry''s'+ Arlington Heights'+ 'IL'+ '2/1/03'+ 'Kimi Hayes' | |
| 'Shark City'+ Glendale Heights'+' IL'+ '12/28/02'+ 'Prezence' | |
| 'Tommy''s Place'+ Blue Island'+ 'IL'+ '12/28/02'+ 'Blue Sunday/White Crow' | |
| 'Stonecutters ''Seafood'' and Chop House'+ 'Lemont'+ 'IL'+ '12/19/02'+ 'Week Back' | |
| """ | |
| sample10 = dedent(""" | |
| abc,def | |
| ghijkl,mno | |
| ghi,jkl | |
| """) | |
| sample11 = dedent(""" | |
| abc,def | |
| ghijkl,mnop | |
| ghi,jkl | |
| """) | |
| sample12 = dedent(""""time","forces" | |
| 1,1.5 | |
| 0.5,5+0j | |
| 0,0 | |
| 1+1j,6 | |
| """) | |
| sample13 = dedent(""""time","forces" | |
| 0,0 | |
| 1,2 | |
| a,b | |
| """) | |
| sample14 = """\ | |
| abc\0def | |
| ghijkl\0mno | |
| ghi\0jkl | |
| """ | |
| sample15 = "\n\n\n" | |
| sample16 = "abc\ndef\nghi" | |
| sample17 = ["letter,offset"] | |
| sample17.extend(f"{chr(ord('a') + i)},{i}" for i in range(20)) | |
| sample17.append("v,twenty_one") # 'u' was skipped | |
| sample17 = '\n'.join(sample17) | |
| sample18 = ["letter,offset"] | |
| sample18.extend(f"{chr(ord('a') + i)},{i}" for i in range(21)) | |
| sample18.append("v,twenty_one") # 'u' was not skipped | |
| sample18 = '\n'.join(sample18) | |
| sample19 = ('time,title\r\n' | |
| '2020-10-01,"Pocket - Save news, videos, stories and more"\r\n') | |
| def test_issue43625(self): | |
| sniffer = csv.Sniffer() | |
| self.assertTrue(sniffer.has_header(self.sample12)) | |
| self.assertFalse(sniffer.has_header(self.sample13)) | |
| def test_has_header_strings(self): | |
| "More to document existing (unexpected?) behavior than anything else." | |
| sniffer = csv.Sniffer() | |
| self.assertFalse(sniffer.has_header(self.sample10)) | |
| self.assertFalse(sniffer.has_header(self.sample11)) | |
| def test_has_header(self): | |
| sniffer = csv.Sniffer() | |
| self.assertIs(sniffer.has_header(self.sample1), False) | |
| self.assertIs(sniffer.has_header(self.header1 + self.sample1), True) | |
| def test_has_header_regex_special_delimiter(self): | |
| sniffer = csv.Sniffer() | |
| self.assertIs(sniffer.has_header(self.sample8), False) | |
| self.assertIs(sniffer.has_header(self.header2 + self.sample8), True) | |
| def test_has_header_checks_20_rows(self): | |
| sniffer = csv.Sniffer() | |
| self.assertFalse(sniffer.has_header(self.sample17)) | |
| self.assertTrue(sniffer.has_header(self.sample18)) | |
| def test_guess_quote_and_delimiter(self): | |
| sniffer = csv.Sniffer() | |
| for header in (";'123;4';", "'123;4';", ";'123;4'"): | |
| with self.subTest(header): | |
| dialect = sniffer.sniff(header, ",;") | |
| self.assertEqual(dialect.delimiter, ';') | |
| self.assertEqual(dialect.quotechar, "'") | |
| self.assertIs(dialect.doublequote, False) | |
| self.assertIs(dialect.skipinitialspace, False) | |
| # A single quoted field is a single column without a delimiter. | |
| self.assertRaisesRegex(csv.Error, "Could not determine delimiter", | |
| sniffer.sniff, "'123;4'", ",;") | |
| def test_sniff(self): | |
| sniffer = csv.Sniffer() | |
| dialect = sniffer.sniff(self.sample1) | |
| self.assertEqual(dialect.delimiter, ",") | |
| self.assertEqual(dialect.quotechar, '"') | |
| self.assertIs(dialect.skipinitialspace, True) | |
| dialect = sniffer.sniff(self.sample2) | |
| self.assertEqual(dialect.delimiter, ":") | |
| self.assertEqual(dialect.quotechar, "'") | |
| self.assertIs(dialect.skipinitialspace, False) | |
| def test_delimiters(self): | |
| sniffer = csv.Sniffer() | |
| dialect = sniffer.sniff(self.sample3) | |
| # given that all three lines in sample3 are equal, | |
| # I think that any character could have been 'guessed' as the | |
| # delimiter, depending on dictionary order | |
| self.assertIn(dialect.delimiter, self.sample3) | |
| dialect = sniffer.sniff(self.sample3, delimiters="?,") | |
| self.assertEqual(dialect.delimiter, "?") | |
| dialect = sniffer.sniff(self.sample3, delimiters="/,") | |
| self.assertEqual(dialect.delimiter, "/") | |
| dialect = sniffer.sniff(self.sample4) | |
| self.assertEqual(dialect.delimiter, ";") | |
| dialect = sniffer.sniff(self.sample5) | |
| self.assertEqual(dialect.delimiter, "\t") | |
| dialect = sniffer.sniff(self.sample6) | |
| self.assertEqual(dialect.delimiter, "|") | |
| dialect = sniffer.sniff(self.sample7) | |
| self.assertEqual(dialect.delimiter, "|") | |
| self.assertEqual(dialect.quotechar, "'") | |
| dialect = sniffer.sniff(self.sample8) | |
| self.assertEqual(dialect.delimiter, '+') | |
| dialect = sniffer.sniff(self.sample9) | |
| self.assertEqual(dialect.delimiter, '+') | |
| self.assertEqual(dialect.quotechar, "'") | |
| dialect = sniffer.sniff(self.sample14) | |
| self.assertEqual(dialect.delimiter, '\0') | |
| self.assertRaisesRegex(csv.Error, "Could not determine delimiter", | |
| sniffer.sniff, self.sample15) | |
| self.assertRaisesRegex(csv.Error, "Could not determine delimiter", | |
| sniffer.sniff, self.sample16) | |
| dialect = sniffer.sniff(self.sample19) | |
| self.assertEqual(dialect.delimiter, ',') | |
| self.assertEqual(dialect.quotechar, '"') | |
| def test_sniff_escapechar(self): | |
| # gh-83273: escaped delimiters make the delimiter frequencies | |
| # inconsistent, but the escape character can be detected by trial | |
| # parsing. | |
| sniffer = csv.Sniffer() | |
| sample = 'ab,cd\\,ef\ngh\\,ij,kl\nmn,op\n' | |
| dialect = sniffer.sniff(sample) | |
| self.assertEqual(dialect.delimiter, ',') | |
| self.assertEqual(dialect.escapechar, '\\') | |
| self.assertIs(dialect.doublequote, False) | |
| self.assertEqual(list(csv.reader(StringIO(sample), dialect)), | |
| [['ab', 'cd,ef'], ['gh,ij', 'kl'], ['mn', 'op']]) | |
| # No escape character in the sample -- none is detected. | |
| dialect = sniffer.sniff('ab,cd\ngh,ij\n') | |
| self.assertEqual(dialect.delimiter, ',') | |
| self.assertIsNone(dialect.escapechar) | |
| def test_sniff_quoted_rows_among_unquoted(self): | |
| # Rows which happen to consist of a single quoted or unquoted | |
| # field must not be mistaken for a single column of quoted fields. | |
| sniffer = csv.Sniffer() | |
| sample = '"header line"\na|b\nc|d\ne|f\n' | |
| self.assertEqual(sniffer.sniff(sample).delimiter, '|') | |
| # Even if an unterminated quote breaks the quoted parse. | |
| sample = '"header"\na|"b c\nd|e\nf|g\n' | |
| self.assertEqual(sniffer.sniff(sample).delimiter, '|') | |
| def test_sniff_single_column_quoted(self): | |
| # gh-98820: a sample consisting of a single column of quoted fields | |
| # has no delimiter to detect, even if the quoted content contains | |
| # characters which could pass for one. It also used to take | |
| # quadratic time before failing. | |
| sniffer = csv.Sniffer() | |
| sample = '\n'.join('"%02d-%02d-%02d"' % (i, i, i) for i in range(50)) | |
| self.assertRaisesRegex(csv.Error, "Could not determine delimiter", | |
| sniffer.sniff, sample) | |
| # Even if none of the requested delimiters occurs in the sample. | |
| self.assertRaisesRegex(csv.Error, "Could not determine delimiter", | |
| sniffer.sniff, sample, ',:|\t') | |
| # A mix of quoted and unquoted single-field rows. | |
| sample = '"abc"\ndef\n"ghi"\njkl\n' * 10 | |
| self.assertRaisesRegex(csv.Error, "Could not determine delimiter", | |
| sniffer.sniff, sample) | |
| # Even if the quoted fields contain delimiter characters. | |
| sample = '"a,b"\ncd\n' * 20 | |
| self.assertRaisesRegex(csv.Error, "Could not determine delimiter", | |
| sniffer.sniff, sample) | |
| # Even if the content of the quoted fields parses consistently | |
| # with the other quote character. | |
| sample = '''"a-'b'-c"\n"d-'e'-f"\n''' * 10 | |
| self.assertRaisesRegex(csv.Error, "Could not determine delimiter", | |
| sniffer.sniff, sample) | |
| def test_sniff_non_ascii_delimiter(self): | |
| # gh-111820: an explicitly requested delimiter can be non-ASCII. | |
| sniffer = csv.Sniffer() | |
| sample = 'aaa\xacbbb\xacccc\nddd\xaceee\xacfff\nggg\xachhh\xaciii\n' | |
| dialect = sniffer.sniff(sample, delimiters='\xac') | |
| self.assertEqual(dialect.delimiter, '\xac') | |
| def test_sniff_preamble(self): | |
| # A preamble (title or comment lines) before the data must not | |
| # prevent detection, even if it is larger than the part of the | |
| # sample which is parsed first. It is enough for the data rows | |
| # to slightly outnumber the preamble lines. | |
| sniffer = csv.Sniffer() | |
| for n in 3, 24, 80, 320: | |
| preamble = ''.join(f'Comment line {i:05}\n' for i in range(n)) | |
| for ndata in n + 2, 2 * n + 5: | |
| with self.subTest(preamble_lines=n, data_lines=ndata): | |
| sample = preamble + 'aaa,bbb,ccc\n' * ndata | |
| self.assertEqual(sniffer.sniff(sample).delimiter, ',') | |
| def test_sniff_line_boundary_characters(self): | |
| # Only '\r', '\n' and '\r\n' are row separators; characters like | |
| # '\x1c' or '\x85', which str.splitlines() treats as line | |
| # boundaries, are ordinary data for the reader -- '\x1c' can | |
| # even be the delimiter. | |
| sniffer = csv.Sniffer() | |
| sample = 'aa\x1cbb\ncc\x1cdd\nee\x1cff\n' | |
| self.assertEqual(sniffer.sniff(sample).delimiter, '\x1c') | |
| sample = 'a\x85b,c\nd,e\nf,g\n' | |
| dialect = sniffer.sniff(sample) | |
| self.assertEqual(dialect.delimiter, ',') | |
| self.assertEqual(next(csv.reader(StringIO(sample), dialect)), | |
| ['a\x85b', 'c']) | |
| def test_sniff_delimiter_in_quoted_field(self): | |
| # gh-97611: a delimiter inside a quoted field should not win over | |
| # the delimiter which actually separates the fields. | |
| sniffer = csv.Sniffer() | |
| sample = ( | |
| 'Surname;First Name;Year of birth\n' | |
| '"\tDoe;Jane"\t;1971\n' | |
| ) | |
| dialect = sniffer.sniff(sample, delimiters=',;\t') | |
| self.assertEqual(dialect.delimiter, ';') | |
| sample = ( | |
| 'Surname;First Name;Year of birth\n' | |
| '"\t";"\t";1971\n' | |
| '"Le Trec";"Mary Ann";1486\n' | |
| ) | |
| dialect = sniffer.sniff(sample, delimiters=',;\t') | |
| self.assertEqual(dialect.delimiter, ';') | |
| self.assertEqual(dialect.quotechar, '"') | |
| def test_sniff_embedded_lists(self): | |
| # gh-119123: commas in bracketed lists adjacent to quotes should | |
| # not be mistaken for the delimiter. | |
| sniffer = csv.Sniffer() | |
| sample = ( | |
| "id;is_sort;cost;group;merge\n" | |
| "1;True;62.25;['345'];UNKNOWN\n" | |
| "2;True;54.00;['235'];UNKNOWN\n" | |
| "3;True;237.00;['567', '568'];UNKNOWN\n" | |
| "4;True;46.50;['112', '112'];UNKNOWN\n" | |
| ) | |
| dialect = sniffer.sniff(sample, delimiters=',;') | |
| self.assertEqual(dialect.delimiter, ';') | |
| def test_sniff_space_adjacent_to_quotes(self): | |
| # gh-88843: a space adjacent to stray quotes should not be | |
| # detected as the delimiter. | |
| sniffer = csv.Sniffer() | |
| sample = "a|b\nc| 'd\ne|' f" | |
| dialect = sniffer.sniff(sample) | |
| self.assertEqual(dialect.delimiter, '|') | |
| def test_sniff_crlf_lineterminator(self): | |
| # gh-103925: a quote at the end of a \r\n-terminated line. | |
| sniffer = csv.Sniffer() | |
| sample = ( | |
| 'Timestamp,URL,Title\r\n' | |
| '2020-10-01 17:17:37+08:00,' | |
| 'https://www.mozilla.org/en-US/firefox/welcome/2/,' | |
| '"Pocket - Save news, videos, stories and more"\r\n' | |
| ) | |
| dialect = sniffer.sniff(sample) | |
| self.assertEqual(dialect.delimiter, ',') | |
| self.assertEqual(dialect.quotechar, '"') | |
| self.assertEqual(dialect.lineterminator, '\r\n') | |
| def test_sniff_lineterminator(self): | |
| sniffer = csv.Sniffer() | |
| for lineterminator in '\r\n', '\n', '\r': | |
| with self.subTest(lineterminator=lineterminator): | |
| sample = lineterminator.join(['a,b,c', 'd,e,f', 'g,h,i', '']) | |
| dialect = sniffer.sniff(sample) | |
| self.assertEqual(dialect.lineterminator, lineterminator) | |
| self.assertEqual(dialect.delimiter, ',') | |
| # The majority wins. | |
| sample = 'a,b,c\nd,e,f\r\ng,h,i\n' | |
| self.assertEqual(sniffer.sniff(sample).lineterminator, '\n') | |
| sample = 'a,b,c\r\nd,e,f\ng,h,i\r\n' | |
| self.assertEqual(sniffer.sniff(sample).lineterminator, '\r\n') | |
| # A line break inside a quoted field is counted too, but it is | |
| # outvoted by the real ones. | |
| sample = 'a,"x\ny",c\r\nd,e,f\r\ng,h,i\r\n' | |
| self.assertEqual(sniffer.sniff(sample).lineterminator, '\r\n') | |
| def test_sniff_lineterminator_tie(self): | |
| # A tie is broken in the order '\r\n', '\n', '\r'. | |
| sniffer = csv.Sniffer() | |
| for sample, lineterminator in ( | |
| ('a,b,c\nd,e,f\r\n', '\r\n'), | |
| ('a,b,c\r\nd,e,f\ng,h,i\rj,k,l', '\r\n'), | |
| ('a,b,c\nd,e,f\rg,h,i', '\n'), | |
| # A sample without a complete line is a tie of zeros. | |
| ('a,b,c', '\r\n'), | |
| ): | |
| with self.subTest(sample=sample): | |
| self.assertEqual(sniffer.sniff(sample).lineterminator, | |
| lineterminator) | |
| def test_sniff_excel_tab_with_quotes(self): | |
| # gh-62029: tab-delimited data with a quoted field containing | |
| # spaces and doubled quotes. | |
| sniffer = csv.Sniffer() | |
| sample = ('foo\tbar\t"baz ""quoted"" here"\tspam eggs\n' | |
| 'ham\teggs\tx y\tz w\n') | |
| dialect = sniffer.sniff(sample) | |
| self.assertEqual(dialect.delimiter, '\t') | |
| self.assertEqual(dialect.quotechar, '"') | |
| self.assertIs(dialect.doublequote, True) | |
| def test_sniff_truncated_sample(self): | |
| # A sample cut off in the middle of a quoted field should not | |
| # spoil the detection. | |
| sniffer = csv.Sniffer() | |
| sample = '"a,a";"b"\n"c";"d"\n"e";"f,f\n' | |
| dialect = sniffer.sniff(sample) | |
| self.assertEqual(dialect.delimiter, ';') | |
| self.assertEqual(dialect.quotechar, '"') | |
| # Cut off in the middle of the last row. | |
| sample = 'a,b,c\nd,e,f\ng,h,i\nj,k' | |
| self.assertEqual(sniffer.sniff(sample).delimiter, ',') | |
| # Cut off in the middle of an escaped sequence. | |
| sample = 'ab,cd\\,ef\ngh\\,ij,kl\nmn,op\nqr,st\\' | |
| dialect = sniffer.sniff(sample) | |
| self.assertEqual(dialect.delimiter, ',') | |
| self.assertEqual(dialect.escapechar, '\\') | |
| # Cut off at a line end in the middle of a quoted field. | |
| sample = '"a","b"\n"c","d"\n"e","multi\nline' | |
| self.assertEqual(sniffer.sniff(sample).delimiter, ',') | |
| # An unclosed quote consumes everything to the end of the sample, | |
| # but the rows before it still count. | |
| sample = 'a|b\nc|d\ne|f\ng|"h\ni|j\nk|l' | |
| self.assertEqual(sniffer.sniff(sample).delimiter, '|') | |
| def test_sniff_skipinitialspace_quoted(self): | |
| sniffer = csv.Sniffer() | |
| sample = "'a': 'b': 'c'\n'd': 'e': 'f'\n" | |
| dialect = sniffer.sniff(sample) | |
| self.assertEqual(dialect.delimiter, ':') | |
| self.assertEqual(dialect.quotechar, "'") | |
| self.assertIs(dialect.skipinitialspace, True) | |
| def test_sniff_skipinitialspace_quoted_fields(self): | |
| # A quote is only a quote at the very start of a field, so not | |
| # skipping the space splits the quoted field. | |
| sniffer = csv.Sniffer() | |
| sample = 'a, "b,c"\nd,e\nf,g\n' | |
| dialect = sniffer.sniff(sample) | |
| self.assertEqual(dialect.delimiter, ',') | |
| self.assertEqual(dialect.quotechar, '"') | |
| self.assertIs(dialect.skipinitialspace, True) | |
| self.assertEqual(next(csv.reader(StringIO(sample), dialect)), | |
| ['a', 'b,c']) | |
| # But without a delimiter inside the quotes nothing is split, | |
| # so only the padding counts. | |
| sample = 'a, "b"\nd,e\nf,g\n' | |
| dialect = sniffer.sniff(sample) | |
| self.assertEqual(dialect.delimiter, ',') | |
| self.assertEqual(dialect.quotechar, '"') | |
| self.assertIs(dialect.skipinitialspace, False) | |
| self.assertEqual(next(csv.reader(StringIO(sample), dialect)), | |
| ['a', ' "b"']) | |
| def test_sniff_skipinitialspace_data(self): | |
| # The spaces are a part of the data if only some fields | |
| # are padded. | |
| sniffer = csv.Sniffer() | |
| sample = 'a, b\nc,d\ne, f\n' | |
| dialect = sniffer.sniff(sample) | |
| self.assertEqual(dialect.delimiter, ',') | |
| self.assertIs(dialect.skipinitialspace, False) | |
| self.assertEqual(next(csv.reader(StringIO(sample), dialect)), | |
| ['a', ' b']) | |
| def test_sniff_skipinitialspace_not_skipped(self): | |
| # A quoted or escaped space is not skipped, so it is not | |
| # an evidence of the padding. | |
| sniffer = csv.Sniffer() | |
| sample = 'a," b"\nc, d\n' | |
| dialect = sniffer.sniff(sample) | |
| self.assertEqual(dialect.delimiter, ',') | |
| self.assertEqual(dialect.quotechar, '"') | |
| self.assertIs(dialect.skipinitialspace, False) | |
| self.assertEqual(list(csv.reader(StringIO(sample), dialect)), | |
| [['a', ' b'], ['c', ' d']]) | |
| # The escaped delimiter forces the escapechar detection. | |
| sample = 'a,\\ b\\,c\nd, e\n' | |
| dialect = sniffer.sniff(sample) | |
| self.assertEqual(dialect.delimiter, ',') | |
| self.assertEqual(dialect.escapechar, '\\') | |
| self.assertIs(dialect.skipinitialspace, False) | |
| self.assertEqual(list(csv.reader(StringIO(sample), dialect)), | |
| [['a', ' b,c'], ['d', ' e']]) | |
| def test_sniff_regex_backtracking(self): | |
| # gh-109638: this artificial sample used to take minutes. | |
| sniffer = csv.Sniffer() | |
| sample = '"",' * 100 + '"' * 100 + '0' + '"' * 100 + '0' | |
| self.assertEqual(sniffer.sniff(sample).delimiter, ',') | |
| def test_doublequote(self): | |
| sniffer = csv.Sniffer() | |
| dialect = sniffer.sniff(self.header1) | |
| self.assertFalse(dialect.doublequote) | |
| dialect = sniffer.sniff(self.header2) | |
| self.assertFalse(dialect.doublequote) | |
| dialect = sniffer.sniff(self.sample2) | |
| self.assertTrue(dialect.doublequote) | |
| dialect = sniffer.sniff(self.sample8) | |
| self.assertFalse(dialect.doublequote) | |
| dialect = sniffer.sniff(self.sample9) | |
| self.assertTrue(dialect.doublequote) | |
| # A doubled quote character in an unquoted field or an empty | |
| # quoted field is not evidence of doubling. | |
| dialect = sniffer.sniff('"x",a""b\n"y",c\n') | |
| self.assertIs(dialect.doublequote, False) | |
| dialect = sniffer.sniff('a,"",c\nd,"",f\n') | |
| self.assertIs(dialect.doublequote, False) | |
| # A doubled quote character inside a quoted field is. | |
| dialect = sniffer.sniff('"a""b",c\n"d",e\n') | |
| self.assertIs(dialect.doublequote, True) | |
| def test_guess_delimiter_crlf_not_chosen(self): | |
| # Ensure that we pick the real delimiter ("|") over "\r" in a tie. | |
| sniffer = csv.Sniffer() | |
| sample = "a|b\r\nc|d\r\ne|f\r\n" | |
| self.assertEqual(sniffer.sniff(sample).delimiter, "|") | |
| self.assertNotEqual(sniffer.sniff(sample).delimiter, "\r") | |
| def test_zero_mode_tie_order_independence(self): | |
| sniffer = csv.Sniffer() | |
| # ":" appears in half the rows (1, 0, 1, 0) - a tie between | |
| # 0 and 1 per line. | |
| # "," appears once every row (true delimiter). | |
| # | |
| # Even if the zero-frequency bucket is appended vs. inserted, the tie | |
| # yields an adjusted score of 0, so ":" should not be promoted and | |
| # "," must be selected. | |
| sample = ( | |
| "a,b:c\n" | |
| "d,e\n" | |
| "f,g:c\n" | |
| "h,i\n" | |
| ) | |
| dialect = sniffer.sniff(sample) | |
| self.assertEqual(dialect.delimiter, ",") | |
| def test_zero_mode_tie_order_comma_first(self): | |
| sniffer = csv.Sniffer() | |
| pattern = ( | |
| "a,b\n" | |
| "c:d\n" | |
| "e,f\n" | |
| "g:h\n" | |
| ) | |
| sample = pattern * 10 | |
| with self.assertRaisesRegex(csv.Error, "Could not determine delimiter"): | |
| sniffer.sniff(sample) | |
| def test_zero_mode_tie_order_colon_first(self): | |
| sniffer = csv.Sniffer() | |
| pattern = ( | |
| "a:b\n" | |
| "c,d\n" | |
| "e:f\n" | |
| "g,h\n" | |
| ) | |
| sample = pattern * 10 | |
| with self.assertRaisesRegex(csv.Error, "Could not determine delimiter"): | |
| sniffer.sniff(sample) | |
| class NUL: | |
| def write(s, *args): | |
| pass | |
| writelines = write | |
| @unittest.skipUnless(hasattr(sys, "gettotalrefcount"), | |
| 'requires sys.gettotalrefcount()') | |
| class TestLeaks(unittest.TestCase): | |
| def test_create_read(self): | |
| delta = 0 | |
| lastrc = sys.gettotalrefcount() | |
| for i in range(20): | |
| gc.collect() | |
| self.assertEqual(gc.garbage, []) | |
| rc = sys.gettotalrefcount() | |
| csv.reader(["a,b,c\r\n"]) | |
| csv.reader(["a,b,c\r\n"]) | |
| csv.reader(["a,b,c\r\n"]) | |
| delta = rc-lastrc | |
| lastrc = rc | |
| # if csv.reader() leaks, last delta should be 3 or more | |
| self.assertLess(delta, 3) | |
| def test_create_write(self): | |
| delta = 0 | |
| lastrc = sys.gettotalrefcount() | |
| s = NUL() | |
| for i in range(20): | |
| gc.collect() | |
| self.assertEqual(gc.garbage, []) | |
| rc = sys.gettotalrefcount() | |
| csv.writer(s) | |
| csv.writer(s) | |
| csv.writer(s) | |
| delta = rc-lastrc | |
| lastrc = rc | |
| # if csv.writer() leaks, last delta should be 3 or more | |
| self.assertLess(delta, 3) | |
| def test_read(self): | |
| delta = 0 | |
| rows = ["a,b,c\r\n"]*5 | |
| lastrc = sys.gettotalrefcount() | |
| for i in range(20): | |
| gc.collect() | |
| self.assertEqual(gc.garbage, []) | |
| rc = sys.gettotalrefcount() | |
| rdr = csv.reader(rows) | |
| for row in rdr: | |
| pass | |
| delta = rc-lastrc | |
| lastrc = rc | |
| # if reader leaks during read, delta should be 5 or more | |
| self.assertLess(delta, 5) | |
| def test_write(self): | |
| delta = 0 | |
| rows = [[1,2,3]]*5 | |
| s = NUL() | |
| lastrc = sys.gettotalrefcount() | |
| for i in range(20): | |
| gc.collect() | |
| self.assertEqual(gc.garbage, []) | |
| rc = sys.gettotalrefcount() | |
| writer = csv.writer(s) | |
| for row in rows: | |
| writer.writerow(row) | |
| delta = rc-lastrc | |
| lastrc = rc | |
| # if writer leaks during write, last delta should be 5 or more | |
| self.assertLess(delta, 5) | |
| class TestUnicode(unittest.TestCase): | |
| names = ["Martin von Löwis", | |
| "Marc André Lemburg", | |
| "Guido van Rossum", | |
| "François Pinard"] | |
| def test_unicode_read(self): | |
| with TemporaryFile("w+", newline='', encoding="utf-8") as fileobj: | |
| fileobj.write(",".join(self.names) + "\r\n") | |
| fileobj.seek(0) | |
| reader = csv.reader(fileobj) | |
| self.assertEqual(list(reader), [self.names]) | |
| def test_unicode_write(self): | |
| with TemporaryFile("w+", newline='', encoding="utf-8") as fileobj: | |
| writer = csv.writer(fileobj) | |
| writer.writerow(self.names) | |
| expected = ",".join(self.names)+"\r\n" | |
| fileobj.seek(0) | |
| self.assertEqual(fileobj.read(), expected) | |
| class KeyOrderingTest(unittest.TestCase): | |
| def test_ordering_for_the_dict_reader_and_writer(self): | |
| resultset = set() | |
| for keys in permutations("abcde"): | |
| with TemporaryFile('w+', newline='', encoding="utf-8") as fileobject: | |
| dw = csv.DictWriter(fileobject, keys) | |
| dw.writeheader() | |
| fileobject.seek(0) | |
| dr = csv.DictReader(fileobject) | |
| kt = tuple(dr.fieldnames) | |
| self.assertEqual(keys, kt) | |
| resultset.add(kt) | |
| # Final sanity check: were all permutations unique? | |
| self.assertEqual(len(resultset), 120, "Key ordering: some key permutations not collected (expected 120)") | |
| def test_ordered_dict_reader(self): | |
| data = dedent('''\ | |
| FirstName,LastName | |
| Eric,Idle | |
| Graham,Chapman,Over1,Over2 | |
| Under1 | |
| John,Cleese | |
| ''').splitlines() | |
| self.assertEqual(list(csv.DictReader(data)), | |
| [OrderedDict([('FirstName', 'Eric'), ('LastName', 'Idle')]), | |
| OrderedDict([('FirstName', 'Graham'), ('LastName', 'Chapman'), | |
| (None, ['Over1', 'Over2'])]), | |
| OrderedDict([('FirstName', 'Under1'), ('LastName', None)]), | |
| OrderedDict([('FirstName', 'John'), ('LastName', 'Cleese')]), | |
| ]) | |
| self.assertEqual(list(csv.DictReader(data, restkey='OtherInfo')), | |
| [OrderedDict([('FirstName', 'Eric'), ('LastName', 'Idle')]), | |
| OrderedDict([('FirstName', 'Graham'), ('LastName', 'Chapman'), | |
| ('OtherInfo', ['Over1', 'Over2'])]), | |
| OrderedDict([('FirstName', 'Under1'), ('LastName', None)]), | |
| OrderedDict([('FirstName', 'John'), ('LastName', 'Cleese')]), | |
| ]) | |
| del data[0] # Remove the header row | |
| self.assertEqual(list(csv.DictReader(data, fieldnames=['fname', 'lname'])), | |
| [OrderedDict([('fname', 'Eric'), ('lname', 'Idle')]), | |
| OrderedDict([('fname', 'Graham'), ('lname', 'Chapman'), | |
| (None, ['Over1', 'Over2'])]), | |
| OrderedDict([('fname', 'Under1'), ('lname', None)]), | |
| OrderedDict([('fname', 'John'), ('lname', 'Cleese')]), | |
| ]) | |
| class MiscTestCase(unittest.TestCase): | |
| def test__all__(self): | |
| support.check__all__(self, csv, ('csv', '_csv')) | |
| @cpython_only | |
| def test_lazy_import(self): | |
| ensure_lazy_imports("csv", {"re"}) | |
| def test_subclassable(self): | |
| # issue 44089 | |
| class Foo(csv.Error): ... | |
| @support.cpython_only | |
| def test_disallow_instantiation(self): | |
| _csv = import_helper.import_module("_csv") | |
| for tp in _csv.Reader, _csv.Writer: | |
| with self.subTest(tp=tp): | |
| check_disallow_instantiation(self, tp) | |
| class TestModule(unittest.TestCase): | |
| def test_deprecated__version__(self): | |
| with self.assertWarnsRegex( | |
| DeprecationWarning, | |
| "'__version__' is deprecated and slated for removal in Python 3.20", | |
| ) as cm: | |
| getattr(csv, "__version__") | |
| self.assertEqual(cm.filename, __file__) | |
| if __name__ == '__main__': | |
| unittest.main() |