[Python-Dev] Bad interaction of index and sequence repeat (original) (raw)
Nick Coghlan ncoghlan at gmail.com
Fri Jul 28 18:33:01 CEST 2006
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Tim Peters wrote:
OTOH, in the long discussion about PEP 357, I'm not sure anyone except Travis was clear on whether nbindex was meant to apply only to sequence /slicing/ or was meant to apply "everywhere an object gets used in an index-like context". Clipping makes sense only for the former, but it looks like the implementation treats it more like the latter. This was probably exacerbated by:
http://mail.python.org/pipermail/python-dev/2006-February/060663.html [Travis] There are other places in Python that check specifically for int objects and long integer objects and fail with anything else. Perhaps all of these should aslo call the index slot. [Guido] Right, absolutely. This is a mess :-)
I've been trawling through the code a bit, and I don't think it's as bad as all that.
All I believe is really needed is to:
- remove the PyErr_Occurred() check and its body from long_index in longobject.c
- add a PyErr_Occurred() check to force a -1 return from PyNumber_Index in abstract.c
- add a PyErr_Occurred() and PyErr_ExceptionMatches(PyOverflowError) check to invoke PyErr_Clear() in _PyEval_SliceIndex in ceval.c.
Add test cases to test_index.py to check that:
(2100).index() == 2100 (-2100).index() == -2100 slice(-2100, 2100).indices(sys.maxint) == (0, sys.maxint, 1) "a" * 2**100 raises OverflowError
Add test cases to test_operator.py to check that:
operator.index(2100) == 2100 operator.index(-2100) == -2100
Cheers, Nick.
-- Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia
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