Message 67783 - Python tracker

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In-reply-to
Author	rhettinger
Recipients	exarkun, rhettinger, therve
Date	2008年06月06日.20:17:47
SpamBayes Score	0.005142702
Marked as misclassified	No
Message-id	<1212783470.98.0.0258583277018.issue3051@psf.upfronthosting.co.za>

Content
I'll fix this to accommodate both cases, __lt__ and __le__. After trying x<y and finding the comparison isn't defined, it can try (not y<=x) instead. Also, will document that either __cmp__ or all six rich comparisons should be defined for code that wants to run through sort, bisect, min/max, or heapq. The rich comparison PEP is clear on this point, but I don't think the affirmative statement ever made it to main docs: "The reflexivity rules are assumed by Python. Thus, the interpreter may swap y>x with x<y, y>=x with x<=y, and may swap the arguments of x==y and x!=y." -- PEP 207

Content

I'll fix this to accommodate both cases, __lt__ and __le__. After 
trying x<y and finding the comparison isn't defined, it can try (not 
y<=x) instead.
Also, will document that either __cmp__ or all six rich comparisons 
should be defined for code that wants to run through sort, bisect, 
min/max, or heapq. The rich comparison PEP is clear on this point, but 
I don't think the affirmative statement ever made it to main docs:
"The reflexivity rules *are* assumed by Python. Thus, the
interpreter may swap y>x with x<y, y>=x with x<=y, and may swap
the arguments of x==y and x!=y." -- PEP 207

History
Date	User	Action	Args
2008年06月06日 20:17:51	rhettinger	set	spambayes_score: 0.0051427 -> 0.005142702 recipients: + rhettinger, exarkun, therve
2008年06月06日 20:17:51	rhettinger	set	spambayes_score: 0.0051427 -> 0.0051427 messageid: <1212783470.98.0.0258583277018.issue3051@psf.upfronthosting.co.za>
2008年06月06日 20:17:49	rhettinger	link	issue3051 messages
2008年06月06日 20:17:48	rhettinger	create

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