| # Python test set -- built-in functions |
| |
| import unittest |
| import sys |
| import pickle |
| import itertools |
| |
| # pure Python implementations (3 args only), for comparison |
| def pyrange(start, stop, step): |
| if (start - stop) // step < 0: |
| # replace stop with next element in the sequence of integers |
| # that are congruent to start modulo step. |
| stop += (start - stop) % step |
| while start != stop: |
| yield start |
| start += step |
| |
| def pyrange_reversed(start, stop, step): |
| stop += (start - stop) % step |
| return pyrange(stop - step, start - step, -step) |
| |
| |
| class RangeTest(unittest.TestCase): |
| def assert_iterators_equal(self, xs, ys, test_id, limit=None): |
| # check that an iterator xs matches the expected results ys, |
| # up to a given limit. |
| if limit is not None: |
| xs = itertools.islice(xs, limit) |
| ys = itertools.islice(ys, limit) |
| sentinel = object() |
| pairs = itertools.zip_longest(xs, ys, fillvalue=sentinel) |
| for i, (x, y) in enumerate(pairs): |
| if x == y: |
| continue |
| elif x == sentinel: |
| self.fail('{}: iterator ended unexpectedly ' |
| 'at position {}; expected {}'.format(test_id, i, y)) |
| elif y == sentinel: |
| self.fail('{}: unexpected excess element {} at ' |
| 'position {}'.format(test_id, x, i)) |
| else: |
| self.fail('{}: wrong element at position {};' |
| 'expected {}, got {}'.format(test_id, i, y, x)) |
| |
| def test_range(self): |
| self.assertEqual(list(range(3)), [0, 1, 2]) |
| self.assertEqual(list(range(1, 5)), [1, 2, 3, 4]) |
| self.assertEqual(list(range(0)), []) |
| self.assertEqual(list(range(-3)), []) |
| self.assertEqual(list(range(1, 10, 3)), [1, 4, 7]) |
| self.assertEqual(list(range(5, -5, -3)), [5, 2, -1, -4]) |
| |
| a = 10 |
| b = 100 |
| c = 50 |
| |
| self.assertEqual(list(range(a, a+2)), [a, a+1]) |
| self.assertEqual(list(range(a+2, a, -1)), [a+2, a+1]) |
| self.assertEqual(list(range(a+4, a, -2)), [a+4, a+2]) |
| |
| seq = list(range(a, b, c)) |
| self.assertIn(a, seq) |
| self.assertNotIn(b, seq) |
| self.assertEqual(len(seq), 2) |
| |
| seq = list(range(b, a, -c)) |
| self.assertIn(b, seq) |
| self.assertNotIn(a, seq) |
| self.assertEqual(len(seq), 2) |
| |
| seq = list(range(-a, -b, -c)) |
| self.assertIn(-a, seq) |
| self.assertNotIn(-b, seq) |
| self.assertEqual(len(seq), 2) |
| |
| self.assertRaises(TypeError, range) |
| self.assertRaises(TypeError, range, 1, 2, 3, 4) |
| self.assertRaises(ValueError, range, 1, 2, 0) |
| |
| self.assertRaises(TypeError, range, 0.0, 2, 1) |
| self.assertRaises(TypeError, range, 1, 2.0, 1) |
| self.assertRaises(TypeError, range, 1, 2, 1.0) |
| self.assertRaises(TypeError, range, 1e100, 1e101, 1e101) |
| |
| self.assertRaises(TypeError, range, 0, "spam") |
| self.assertRaises(TypeError, range, 0, 42, "spam") |
| |
| self.assertEqual(len(range(0, sys.maxsize, sys.maxsize-1)), 2) |
| |
| r = range(-sys.maxsize, sys.maxsize, 2) |
| self.assertEqual(len(r), sys.maxsize) |
| |
| def test_large_operands(self): |
| x = range(10**20, 10**20+10, 3) |
| self.assertEqual(len(x), 4) |
| self.assertEqual(len(list(x)), 4) |
| |
| x = range(10**20+10, 10**20, 3) |
| self.assertEqual(len(x), 0) |
| self.assertEqual(len(list(x)), 0) |
| self.assertFalse(x) |
| |
| x = range(10**20, 10**20+10, -3) |
| self.assertEqual(len(x), 0) |
| self.assertEqual(len(list(x)), 0) |
| self.assertFalse(x) |
| |
| x = range(10**20+10, 10**20, -3) |
| self.assertEqual(len(x), 4) |
| self.assertEqual(len(list(x)), 4) |
| self.assertTrue(x) |
| |
| # Now test range() with longs |
| for x in [range(-2**100), |
| range(0, -2**100), |
| range(0, 2**100, -1)]: |
| self.assertEqual(list(x), []) |
| self.assertFalse(x) |
| |
| a = int(10 * sys.maxsize) |
| b = int(100 * sys.maxsize) |
| c = int(50 * sys.maxsize) |
| |
| self.assertEqual(list(range(a, a+2)), [a, a+1]) |
| self.assertEqual(list(range(a+2, a, -1)), [a+2, a+1]) |
| self.assertEqual(list(range(a+4, a, -2)), [a+4, a+2]) |
| |
| seq = list(range(a, b, c)) |
| self.assertIn(a, seq) |
| self.assertNotIn(b, seq) |
| self.assertEqual(len(seq), 2) |
| self.assertEqual(seq[0], a) |
| self.assertEqual(seq[-1], a+c) |
| |
| seq = list(range(b, a, -c)) |
| self.assertIn(b, seq) |
| self.assertNotIn(a, seq) |
| self.assertEqual(len(seq), 2) |
| self.assertEqual(seq[0], b) |
| self.assertEqual(seq[-1], b-c) |
| |
| seq = list(range(-a, -b, -c)) |
| self.assertIn(-a, seq) |
| self.assertNotIn(-b, seq) |
| self.assertEqual(len(seq), 2) |
| self.assertEqual(seq[0], -a) |
| self.assertEqual(seq[-1], -a-c) |
| |
| def test_large_range(self): |
| # Check long ranges (len > sys.maxsize) |
| # len() is expected to fail due to limitations of the __len__ protocol |
| def _range_len(x): |
| try: |
| length = len(x) |
| except OverflowError: |
| step = x[1] - x[0] |
| length = 1 + ((x[-1] - x[0]) // step) |
| return length |
| |
| a = -sys.maxsize |
| b = sys.maxsize |
| expected_len = b - a |
| x = range(a, b) |
| self.assertIn(a, x) |
| self.assertNotIn(b, x) |
| self.assertRaises(OverflowError, len, x) |
| self.assertTrue(x) |
| self.assertEqual(_range_len(x), expected_len) |
| self.assertEqual(x[0], a) |
| idx = sys.maxsize+1 |
| self.assertEqual(x[idx], a+idx) |
| self.assertEqual(x[idx:idx+1][0], a+idx) |
| with self.assertRaises(IndexError): |
| x[-expected_len-1] |
| with self.assertRaises(IndexError): |
| x[expected_len] |
| |
| a = 0 |
| b = 2 * sys.maxsize |
| expected_len = b - a |
| x = range(a, b) |
| self.assertIn(a, x) |
| self.assertNotIn(b, x) |
| self.assertRaises(OverflowError, len, x) |
| self.assertTrue(x) |
| self.assertEqual(_range_len(x), expected_len) |
| self.assertEqual(x[0], a) |
| idx = sys.maxsize+1 |
| self.assertEqual(x[idx], a+idx) |
| self.assertEqual(x[idx:idx+1][0], a+idx) |
| with self.assertRaises(IndexError): |
| x[-expected_len-1] |
| with self.assertRaises(IndexError): |
| x[expected_len] |
| |
| a = 0 |
| b = sys.maxsize**10 |
| c = 2*sys.maxsize |
| expected_len = 1 + (b - a) // c |
| x = range(a, b, c) |
| self.assertIn(a, x) |
| self.assertNotIn(b, x) |
| self.assertRaises(OverflowError, len, x) |
| self.assertTrue(x) |
| self.assertEqual(_range_len(x), expected_len) |
| self.assertEqual(x[0], a) |
| idx = sys.maxsize+1 |
| self.assertEqual(x[idx], a+(idx*c)) |
| self.assertEqual(x[idx:idx+1][0], a+(idx*c)) |
| with self.assertRaises(IndexError): |
| x[-expected_len-1] |
| with self.assertRaises(IndexError): |
| x[expected_len] |
| |
| a = sys.maxsize**10 |
| b = 0 |
| c = -2*sys.maxsize |
| expected_len = 1 + (b - a) // c |
| x = range(a, b, c) |
| self.assertIn(a, x) |
| self.assertNotIn(b, x) |
| self.assertRaises(OverflowError, len, x) |
| self.assertTrue(x) |
| self.assertEqual(_range_len(x), expected_len) |
| self.assertEqual(x[0], a) |
| idx = sys.maxsize+1 |
| self.assertEqual(x[idx], a+(idx*c)) |
| self.assertEqual(x[idx:idx+1][0], a+(idx*c)) |
| with self.assertRaises(IndexError): |
| x[-expected_len-1] |
| with self.assertRaises(IndexError): |
| x[expected_len] |
| |
| def test_invalid_invocation(self): |
| self.assertRaises(TypeError, range) |
| self.assertRaises(TypeError, range, 1, 2, 3, 4) |
| self.assertRaises(ValueError, range, 1, 2, 0) |
| a = int(10 * sys.maxsize) |
| self.assertRaises(ValueError, range, a, a + 1, int(0)) |
| self.assertRaises(TypeError, range, 1., 1., 1.) |
| self.assertRaises(TypeError, range, 1e100, 1e101, 1e101) |
| self.assertRaises(TypeError, range, 0, "spam") |
| self.assertRaises(TypeError, range, 0, 42, "spam") |
| # Exercise various combinations of bad arguments, to check |
| # refcounting logic |
| self.assertRaises(TypeError, range, 0.0) |
| self.assertRaises(TypeError, range, 0, 0.0) |
| self.assertRaises(TypeError, range, 0.0, 0) |
| self.assertRaises(TypeError, range, 0.0, 0.0) |
| self.assertRaises(TypeError, range, 0, 0, 1.0) |
| self.assertRaises(TypeError, range, 0, 0.0, 1) |
| self.assertRaises(TypeError, range, 0, 0.0, 1.0) |
| self.assertRaises(TypeError, range, 0.0, 0, 1) |
| self.assertRaises(TypeError, range, 0.0, 0, 1.0) |
| self.assertRaises(TypeError, range, 0.0, 0.0, 1) |
| self.assertRaises(TypeError, range, 0.0, 0.0, 1.0) |
| |
| def test_index(self): |
| u = range(2) |
| self.assertEqual(u.index(0), 0) |
| self.assertEqual(u.index(1), 1) |
| self.assertRaises(ValueError, u.index, 2) |
| |
| u = range(-2, 3) |
| self.assertEqual(u.count(0), 1) |
| self.assertEqual(u.index(0), 2) |
| self.assertRaises(TypeError, u.index) |
| |
| class BadExc(Exception): |
| pass |
| |
| class BadCmp: |
| def __eq__(self, other): |
| if other == 2: |
| raise BadExc() |
| return False |
| |
| a = range(4) |
| self.assertRaises(BadExc, a.index, BadCmp()) |
| |
| a = range(-2, 3) |
| self.assertEqual(a.index(0), 2) |
| self.assertEqual(range(1, 10, 3).index(4), 1) |
| self.assertEqual(range(1, -10, -3).index(-5), 2) |
| |
| self.assertEqual(range(10**20).index(1), 1) |
| self.assertEqual(range(10**20).index(10**20 - 1), 10**20 - 1) |
| |
| self.assertRaises(ValueError, range(1, 2**100, 2).index, 2**87) |
| self.assertEqual(range(1, 2**100, 2).index(2**87+1), 2**86) |
| |
| class AlwaysEqual(object): |
| def __eq__(self, other): |
| return True |
| always_equal = AlwaysEqual() |
| self.assertEqual(range(10).index(always_equal), 0) |
| |
| def test_user_index_method(self): |
| bignum = 2*sys.maxsize |
| smallnum = 42 |
| |
| # User-defined class with an __index__ method |
| class I: |
| def __init__(self, n): |
| self.n = int(n) |
| def __index__(self): |
| return self.n |
| self.assertEqual(list(range(I(bignum), I(bignum + 1))), [bignum]) |
| self.assertEqual(list(range(I(smallnum), I(smallnum + 1))), [smallnum]) |
| |
| # User-defined class with a failing __index__ method |
| class IX: |
| def __index__(self): |
| raise RuntimeError |
| self.assertRaises(RuntimeError, range, IX()) |
| |
| # User-defined class with an invalid __index__ method |
| class IN: |
| def __index__(self): |
| return "not a number" |
| |
| self.assertRaises(TypeError, range, IN()) |
| |
| # Test use of user-defined classes in slice indices. |
| self.assertEqual(range(10)[:I(5)], range(5)) |
| |
| with self.assertRaises(RuntimeError): |
| range(0, 10)[:IX()] |
| |
| with self.assertRaises(TypeError): |
| range(0, 10)[:IN()] |
| |
| def test_count(self): |
| self.assertEqual(range(3).count(-1), 0) |
| self.assertEqual(range(3).count(0), 1) |
| self.assertEqual(range(3).count(1), 1) |
| self.assertEqual(range(3).count(2), 1) |
| self.assertEqual(range(3).count(3), 0) |
| self.assertIs(type(range(3).count(-1)), int) |
| self.assertIs(type(range(3).count(1)), int) |
| self.assertEqual(range(10**20).count(1), 1) |
| self.assertEqual(range(10**20).count(10**20), 0) |
| self.assertEqual(range(3).index(1), 1) |
| self.assertEqual(range(1, 2**100, 2).count(2**87), 0) |
| self.assertEqual(range(1, 2**100, 2).count(2**87+1), 1) |
| |
| class AlwaysEqual(object): |
| def __eq__(self, other): |
| return True |
| always_equal = AlwaysEqual() |
| self.assertEqual(range(10).count(always_equal), 10) |
| |
| self.assertEqual(len(range(sys.maxsize, sys.maxsize+10)), 10) |
| |
| def test_repr(self): |
| self.assertEqual(repr(range(1)), 'range(0, 1)') |
| self.assertEqual(repr(range(1, 2)), 'range(1, 2)') |
| self.assertEqual(repr(range(1, 2, 3)), 'range(1, 2, 3)') |
| |
| def test_pickling(self): |
| testcases = [(13,), (0, 11), (-22, 10), (20, 3, -1), |
| (13, 21, 3), (-2, 2, 2), (2**65, 2**65+2)] |
| for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| for t in testcases: |
| with self.subTest(proto=proto, test=t): |
| r = range(*t) |
| self.assertEqual(list(pickle.loads(pickle.dumps(r, proto))), |
| list(r)) |
| |
| def test_iterator_pickling(self): |
| testcases = [(13,), (0, 11), (-22, 10), (20, 3, -1), |
| (13, 21, 3), (-2, 2, 2), (2**65, 2**65+2)] |
| for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| for t in testcases: |
| it = itorg = iter(range(*t)) |
| data = list(range(*t)) |
| |
| d = pickle.dumps(it, proto) |
| it = pickle.loads(d) |
| self.assertEqual(type(itorg), type(it)) |
| self.assertEqual(list(it), data) |
| |
| it = pickle.loads(d) |
| try: |
| next(it) |
| except StopIteration: |
| continue |
| d = pickle.dumps(it, proto) |
| it = pickle.loads(d) |
| self.assertEqual(list(it), data[1:]) |
| |
| def test_exhausted_iterator_pickling(self): |
| for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| r = range(2**65, 2**65+2) |
| i = iter(r) |
| while True: |
| r = next(i) |
| if r == 2**65+1: |
| break |
| d = pickle.dumps(i, proto) |
| i2 = pickle.loads(d) |
| self.assertEqual(list(i), []) |
| self.assertEqual(list(i2), []) |
| |
| def test_large_exhausted_iterator_pickling(self): |
| for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
| r = range(20) |
| i = iter(r) |
| while True: |
| r = next(i) |
| if r == 19: |
| break |
| d = pickle.dumps(i, proto) |
| i2 = pickle.loads(d) |
| self.assertEqual(list(i), []) |
| self.assertEqual(list(i2), []) |
| |
| def test_odd_bug(self): |
| # This used to raise a "SystemError: NULL result without error" |
| # because the range validation step was eating the exception |
| # before NULL was returned. |
| with self.assertRaises(TypeError): |
| range([], 1, -1) |
| |
| def test_types(self): |
| # Non-integer objects *equal* to any of the range's items are supposed |
| # to be contained in the range. |
| self.assertIn(1.0, range(3)) |
| self.assertIn(True, range(3)) |
| self.assertIn(1+0j, range(3)) |
| |
| class C1: |
| def __eq__(self, other): return True |
| self.assertIn(C1(), range(3)) |
| |
| # Objects are never coerced into other types for comparison. |
| class C2: |
| def __int__(self): return 1 |
| def __index__(self): return 1 |
| self.assertNotIn(C2(), range(3)) |
| # ..except if explicitly told so. |
| self.assertIn(int(C2()), range(3)) |
| |
| # Check that the range.__contains__ optimization is only |
| # used for ints, not for instances of subclasses of int. |
| class C3(int): |
| def __eq__(self, other): return True |
| self.assertIn(C3(11), range(10)) |
| self.assertIn(C3(11), list(range(10))) |
| |
| def test_strided_limits(self): |
| r = range(0, 101, 2) |
| self.assertIn(0, r) |
| self.assertNotIn(1, r) |
| self.assertIn(2, r) |
| self.assertNotIn(99, r) |
| self.assertIn(100, r) |
| self.assertNotIn(101, r) |
| |
| r = range(0, -20, -1) |
| self.assertIn(0, r) |
| self.assertIn(-1, r) |
| self.assertIn(-19, r) |
| self.assertNotIn(-20, r) |
| |
| r = range(0, -20, -2) |
| self.assertIn(-18, r) |
| self.assertNotIn(-19, r) |
| self.assertNotIn(-20, r) |
| |
| def test_empty(self): |
| r = range(0) |
| self.assertNotIn(0, r) |
| self.assertNotIn(1, r) |
| |
| r = range(0, -10) |
| self.assertNotIn(0, r) |
| self.assertNotIn(-1, r) |
| self.assertNotIn(1, r) |
| |
| def test_range_iterators(self): |
| # exercise 'fast' iterators, that use a rangeiterobject internally. |
| # see issue 7298 |
| limits = [base + jiggle |
| for M in (2**32, 2**64) |
| for base in (-M, -M//2, 0, M//2, M) |
| for jiggle in (-2, -1, 0, 1, 2)] |
| test_ranges = [(start, end, step) |
| for start in limits |
| for end in limits |
| for step in (-2**63, -2**31, -2, -1, 1, 2)] |
| |
| for start, end, step in test_ranges: |
| iter1 = range(start, end, step) |
| iter2 = pyrange(start, end, step) |
| test_id = "range({}, {}, {})".format(start, end, step) |
| # check first 100 entries |
| self.assert_iterators_equal(iter1, iter2, test_id, limit=100) |
| |
| iter1 = reversed(range(start, end, step)) |
| iter2 = pyrange_reversed(start, end, step) |
| test_id = "reversed(range({}, {}, {}))".format(start, end, step) |
| self.assert_iterators_equal(iter1, iter2, test_id, limit=100) |
| |
| def test_range_iterators_invocation(self): |
| # verify range iterators instances cannot be created by |
| # calling their type |
| rangeiter_type = type(iter(range(0))) |
| self.assertRaises(TypeError, rangeiter_type, 1, 3, 1) |
| long_rangeiter_type = type(iter(range(1 << 1000))) |
| self.assertRaises(TypeError, long_rangeiter_type, 1, 3, 1) |
| |
| def test_slice(self): |
| def check(start, stop, step=None): |
| i = slice(start, stop, step) |
| self.assertEqual(list(r[i]), list(r)[i]) |
| self.assertEqual(len(r[i]), len(list(r)[i])) |
| for r in [range(10), |
| range(0), |
| range(1, 9, 3), |
| range(8, 0, -3), |
| range(sys.maxsize+1, sys.maxsize+10), |
| ]: |
| check(0, 2) |
| check(0, 20) |
| check(1, 2) |
| check(20, 30) |
| check(-30, -20) |
| check(-1, 100, 2) |
| check(0, -1) |
| check(-1, -3, -1) |
| |
| def test_contains(self): |
| r = range(10) |
| self.assertIn(0, r) |
| self.assertIn(1, r) |
| self.assertIn(5.0, r) |
| self.assertNotIn(5.1, r) |
| self.assertNotIn(-1, r) |
| self.assertNotIn(10, r) |
| self.assertNotIn("", r) |
| r = range(9, -1, -1) |
| self.assertIn(0, r) |
| self.assertIn(1, r) |
| self.assertIn(5.0, r) |
| self.assertNotIn(5.1, r) |
| self.assertNotIn(-1, r) |
| self.assertNotIn(10, r) |
| self.assertNotIn("", r) |
| r = range(0, 10, 2) |
| self.assertIn(0, r) |
| self.assertNotIn(1, r) |
| self.assertNotIn(5.0, r) |
| self.assertNotIn(5.1, r) |
| self.assertNotIn(-1, r) |
| self.assertNotIn(10, r) |
| self.assertNotIn("", r) |
| r = range(9, -1, -2) |
| self.assertNotIn(0, r) |
| self.assertIn(1, r) |
| self.assertIn(5.0, r) |
| self.assertNotIn(5.1, r) |
| self.assertNotIn(-1, r) |
| self.assertNotIn(10, r) |
| self.assertNotIn("", r) |
| |
| def test_reverse_iteration(self): |
| for r in [range(10), |
| range(0), |
| range(1, 9, 3), |
| range(8, 0, -3), |
| range(sys.maxsize+1, sys.maxsize+10), |
| ]: |
| self.assertEqual(list(reversed(r)), list(r)[::-1]) |
| |
| def test_issue11845(self): |
| r = range(*slice(1, 18, 2).indices(20)) |
| values = {None, 0, 1, -1, 2, -2, 5, -5, 19, -19, |
| 20, -20, 21, -21, 30, -30, 99, -99} |
| for i in values: |
| for j in values: |
| for k in values - {0}: |
| r[i:j:k] |
| |
| def test_comparison(self): |
| test_ranges = [range(0), range(0, -1), range(1, 1, 3), |
| range(1), range(5, 6), range(5, 6, 2), |
| range(5, 7, 2), range(2), range(0, 4, 2), |
| range(0, 5, 2), range(0, 6, 2)] |
| test_tuples = list(map(tuple, test_ranges)) |
| |
| # Check that equality of ranges matches equality of the corresponding |
| # tuples for each pair from the test lists above. |
| ranges_eq = [a == b for a in test_ranges for b in test_ranges] |
| tuples_eq = [a == b for a in test_tuples for b in test_tuples] |
| self.assertEqual(ranges_eq, tuples_eq) |
| |
| # Check that != correctly gives the logical negation of == |
| ranges_ne = [a != b for a in test_ranges for b in test_ranges] |
| self.assertEqual(ranges_ne, [not x for x in ranges_eq]) |
| |
| # Equal ranges should have equal hashes. |
| for a in test_ranges: |
| for b in test_ranges: |
| if a == b: |
| self.assertEqual(hash(a), hash(b)) |
| |
| # Ranges are unequal to other types (even sequence types) |
| self.assertIs(range(0) == (), False) |
| self.assertIs(() == range(0), False) |
| self.assertIs(range(2) == [0, 1], False) |
| |
| # Huge integers aren't a problem. |
| self.assertEqual(range(0, 2**100 - 1, 2), |
| range(0, 2**100, 2)) |
| self.assertEqual(hash(range(0, 2**100 - 1, 2)), |
| hash(range(0, 2**100, 2))) |
| self.assertNotEqual(range(0, 2**100, 2), |
| range(0, 2**100 + 1, 2)) |
| self.assertEqual(range(2**200, 2**201 - 2**99, 2**100), |
| range(2**200, 2**201, 2**100)) |
| self.assertEqual(hash(range(2**200, 2**201 - 2**99, 2**100)), |
| hash(range(2**200, 2**201, 2**100))) |
| self.assertNotEqual(range(2**200, 2**201, 2**100), |
| range(2**200, 2**201 + 1, 2**100)) |
| |
| # Order comparisons are not implemented for ranges. |
| with self.assertRaises(TypeError): |
| range(0) < range(0) |
| with self.assertRaises(TypeError): |
| range(0) > range(0) |
| with self.assertRaises(TypeError): |
| range(0) <= range(0) |
| with self.assertRaises(TypeError): |
| range(0) >= range(0) |
| |
| |
| def test_attributes(self): |
| # test the start, stop and step attributes of range objects |
| self.assert_attrs(range(0), 0, 0, 1) |
| self.assert_attrs(range(10), 0, 10, 1) |
| self.assert_attrs(range(-10), 0, -10, 1) |
| self.assert_attrs(range(0, 10, 1), 0, 10, 1) |
| self.assert_attrs(range(0, 10, 3), 0, 10, 3) |
| self.assert_attrs(range(10, 0, -1), 10, 0, -1) |
| self.assert_attrs(range(10, 0, -3), 10, 0, -3) |
| |
| def assert_attrs(self, rangeobj, start, stop, step): |
| self.assertEqual(rangeobj.start, start) |
| self.assertEqual(rangeobj.stop, stop) |
| self.assertEqual(rangeobj.step, step) |
| |
| with self.assertRaises(AttributeError): |
| rangeobj.start = 0 |
| with self.assertRaises(AttributeError): |
| rangeobj.stop = 10 |
| with self.assertRaises(AttributeError): |
| rangeobj.step = 1 |
| |
| with self.assertRaises(AttributeError): |
| del rangeobj.start |
| with self.assertRaises(AttributeError): |
| del rangeobj.stop |
| with self.assertRaises(AttributeError): |
| del rangeobj.step |
| |
| if __name__ == "__main__": |
| unittest.main() |
