https://bugs.python.org/review/22341/diff/13462/Doc/library/binascii.rst File Doc/library/binascii.rst (right): https://bugs.python.org/review/22341/diff/13462/Doc/library/binascii.rst#new... Doc/library/binascii.rst:125: the given *crc*. The default initial value is zero. The algorithm May be just write the signature as crc32(data, crc=0) and drop the sentence about the default value? https://bugs.python.org/review/22341/diff/13462/Doc/library/zlib.rst File Doc/library/zlib.rst (right): https://bugs.python.org/review/22341/diff/13462/Doc/library/zlib.rst#newcode... Doc/library/zlib.rst:36: the checksum; otherwise, a default value of 1 is used. Same as for binascii.crc32(). https://bugs.python.org/review/22341/diff/13462/Doc/library/zlib.rst#newcode... Doc/library/zlib.rst:96: default value of zero is used. Same as above. https://bugs.python.org/review/22341/