Message 59062 - Python tracker

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Author	tim.peters
Recipients	falk_steinhauer, mark.dickinson, tim.peters
Date	2007-12-31.21:35:39
SpamBayes Score	0.003294055
Marked as misclassified	No
Message-id	<1199136940.09.0.450649160016.issue1694@psf.upfronthosting.co.za>
In-reply-to

Content
Right, Unix-derived C libraries generally do IEEE-754 "round to nearest/even" rounding, while Microsoft's do "add a half and chop" rounding. The Python reference manual says nothing about this, and neither does the C standard (well, C89 doesn't; unsure about C99). Python's round() function is independent of the platform C string<->float conversions, and intentionally does (as documented) "add a half and chop" rounding.

Right, Unix-derived C libraries generally do IEEE-754 "round to
nearest/even" rounding, while Microsoft's do "add a half and chop"
rounding.  The Python reference manual says nothing about this, and
neither does the C standard (well, C89 doesn't; unsure about C99).

Python's round() function is independent of the platform C
string<->float conversions, and intentionally does (as documented) "add
a half and chop" rounding.

History
Date	User	Action	Args
2007-12-31 21:35:40	tim.peters	set	spambayes_score: 0.00329405 -> 0.003294055 recipients: + tim.peters, mark.dickinson, falk_steinhauer
2007-12-31 21:35:40	tim.peters	set	spambayes_score: 0.00329405 -> 0.00329405 messageid: <1199136940.09.0.450649160016.issue1694@psf.upfronthosting.co.za>
2007-12-31 21:35:40	tim.peters	link	issue1694 messages
2007-12-31 21:35:39	tim.peters	create