[ python-Bugs-1551432 ] __unicode__ breaks for exception class objects

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Bugs item #1551432, was opened at 2006-09-03 05:24
Message generated for change (Comment added) made by bcannon
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 9
Submitted By: Marcin 'Qrczak' Kowalczyk (qrczak)
Assigned to: Nobody/Anonymous (nobody)
Summary: __unicode__ breaks for exception class objects

Initial Comment:
PyObject_Unicode and the unicode function stopped
working on class objects of subclasses of BaseException
in Python 2.5.

>>> unicode(ImportError)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: descriptor '__unicode__' of
'exceptions.BaseException' object needs an argument

It should work analogously to str:

>>> str(ImportError)
"<type 'exceptions.ImportError'>"

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>Comment By: Brett Cannon (bcannon)
Date: 2006-09-05 11:22

Message:
Logged In: YES 
user_id=357491

This is because exceptions now define a proper __unicode__()
method in the PyMethodDef array.  This is what gets called
and it requires an exception instance.  Before it just fell
through to the tp_str slot and that didn't complain.

Unless some knows a better way (short of defining a
tp_unicode slot), the only way to make this work would be to
rip out the __unicode__() method.  This would then require
the function in the tp_str slot to have to detect if its
arguments need to be Unicode or not (and I don't know how to
do that off the top of my head; is their a PyUnicode_Check()?).

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