[issue18515] zipfile._ZipDecryptor generates wasteful crc32 table on import

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I meant my pure Python patch in issue10030. Binding crctable to local variable is one of microoptimizations. Not the largest one however. So in general I not objects. Your patch LGTM. Only one nitpick -- instead "not _ZipDecrypter.crctable" use "_ZipDecrypter.crctable is None".

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<http://bugs.python.org/issue18515>
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