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Diffstat (limited to 'Doc/library/binascii.rst')
| -rw-r--r-- | Doc/library/binascii.rst | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/Doc/library/binascii.rst b/Doc/library/binascii.rst index 2ea0e50..39130a8 100644 --- a/Doc/library/binascii.rst +++ b/Doc/library/binascii.rst @@ -113,8 +113,19 @@ The :mod:`binascii` module defines the following functions: print(binascii.crc32("hello world")) # Or, in two pieces: crc = binascii.crc32("hello") - crc = binascii.crc32(" world", crc) - print(crc) + crc = binascii.crc32(" world", crc) & 0xffffffff + print('crc32 = 0x%08x' % crc) + +.. note:: + To generate the same numeric value across all Python versions and + platforms use crc32(data) & 0xffffffff. If you are only using + the checksum in packed binary format this is not necessary as the + return value will have the correct 32bit binary representation + regardless of sign. + +.. versionchanged:: 3.0 + The return value will always be unsigned and in the range [0, 2**32-1] + regardless of platform. .. function:: b2a_hex(data) |