Message 79542 - Python tracker

➜

This issue tracker has been migrated to GitHub , and is currently read-only.
For more information, see the GitHub FAQs in the Python's Developer Guide.

In-reply-to
Author	beazley
Recipients	beazley, gregory.p.smith, loewis
Date	2009年01月10日.12:12:01
SpamBayes Score	0.11956479
Marked as misclassified	No
Message-id	<1231589523.12.0.0809247258625.issue4903@psf.upfronthosting.co.za>

Content
Placing a note in the standard library documentation would be a start. Just say in Python 3.0 it always returns the result as an unsigned integer whereas in Python 2.6 a 32-bit signed integer is returned. Although the numerical value may differ between versions, the underlying bits are the same. Use crc32() & 0xffffffff to get a consistent value (already noted). Note: Not everyone uses checksums in only a packed-binary format. Having the integer value just change across Python versions like that is a real subtle compatibility problem to point out.

Content

Placing a note in the standard library documentation would be a start. 
Just say in Python 3.0 it always returns the result as an unsigned 
integer whereas in Python 2.6 a 32-bit signed integer is returned. 
Although the numerical value may differ between versions, the underlying 
bits are the same. Use crc32() & 0xffffffff to get a consistent value 
(already noted).
Note: Not everyone uses checksums in only a packed-binary format. 
Having the integer value just change across Python versions like that 
is a real subtle compatibility problem to point out.

History
Date	User	Action	Args
2009年01月10日 12:12:03	beazley	set	recipients: + beazley, loewis, gregory.p.smith
2009年01月10日 12:12:03	beazley	set	messageid: <1231589523.12.0.0809247258625.issue4903@psf.upfronthosting.co.za>
2009年01月10日 12:12:02	beazley	link	issue4903 messages
2009年01月10日 12:12:01	beazley	create

homepage