(refactor) use generator expressions instead of lists (#646)
diff --git a/dpkt/dpkt.py b/dpkt/dpkt.py
index 2183e3e..3d39910 100644
--- a/dpkt/dpkt.py
+++ b/dpkt/dpkt.py
@@ -43,10 +43,10 @@
clsdict['__slots__'] = [x[0] for x in st] + ['data']
t = type.__new__(cls, clsname, clsbases, clsdict)
t.__hdr_fields__ = [x[0] for x in st]
- t.__hdr_fmt__ = byte_order + ''.join([x[1] for x in st])
+ t.__hdr_fmt__ = byte_order + ''.join(x[1] for x in st)
t.__hdr_len__ = struct.calcsize(t.__hdr_fmt__)
t.__hdr_defaults__ = dict(compat_izip(
- t.__hdr_fields__, [x[2] for x in st]))
+ t.__hdr_fields__, (x[2] for x in st)))
# process __bit_fields__
bit_fields = getattr(t, '__bit_fields__', None)
