New submission from Fred L. Drake, Jr. <[EMAIL PROTECTED]>:
There's a strange condition where cmp() of tuples of unorderable values
returns -1 even though using the unorderable values raises an exception.
If I have these two unorderable values, cmp() raises an expected exception:
>>> s0 = frozenset(['testing 0'])
>>> s1 = frozenset(['testing 1'])
>>> cmp(s0, s1)
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: cannot compare sets using cmp()
Comparing tuples of the values returns -1:
>>> cmp((s0,), (s1,))
-1
Py3k does raise a TypeError, but the message is indecipherable:
>>> cmp((s0,), (s1,))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unorderable types: 'tuple' != 'tuple'
(The Py3k message for the set comparison is the same as for Python 2.)
I believe that this is an error; the exception from the underlying item
comparison should be propagated.
----------
components: Interpreter Core
messages: 72981
nosy: fdrake
severity: normal
status: open
title: Tuple comparison masking exception
type: behavior
versions: Python 2.4, Python 2.5, Python 2.6, Python 3.0
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Python tracker <[EMAIL PROTECTED]>
<http://bugs.python.org/issue3829>
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