New submission from Joseph Armbruster:
URL: http://svn.python.org/projects/python/branches/py3k
Rev: 59215
Session illustrating issue:
a = None
[40667 refs]
cmp(a,None)
Traceback (most recent call last):
File stdin, line 1, in module
TypeError: unorderable types: NoneType() NoneType()
Christian Heimes added the comment:
Guido, do we want cmp(None, None) to return a value or is the exception
expected?
--
assignee: - gvanrossum
nosy: +gvanrossum
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Tracker [EMAIL PROTECTED]
http://bugs.python.org/issue1513
Guido van Rossum added the comment:
This is not a bug. There's not much point is supporting cmp(None, None)
when cmp(None, anything else) would still fail. cmp() should only be
used when you know that the arguments belong to an orderable type.
--
resolution: - rejected
status: open -
Joseph Armbruster added the comment:
I had looked at the behavior in 2.5 and did not know if this would still
be the case:
cmp(None,'a')
-1
cmp('a',None)
1
cmp(None,None)
0
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Tracker [EMAIL PROTECTED]
http://bugs.python.org/issue1513
Guido van Rossum added the comment:
All three of those are errors in 3.0.
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http://bugs.python.org/issue1513
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Georg Brandl added the comment:
Well, the cmp() docs say that
cmp(x, y) is zero if ``x == y``, so at least the docs must be changed
to explain the new behavior (which I can't specify).
--
nosy: +georg.brandl
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