[ python-Bugs-1249837 ] container methods raise KeyError not IndexError

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Bugs item #1249837, was opened at 2005-08-01 15:47
Message generated for change (Comment added) made by rhettinger
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Category: Documentation
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Wilfredo Sanchez (wsanchez)
>Assigned to: Raymond Hettinger (rhettinger)
Summary: container methods raise KeyError not IndexError

Initial Comment:
See: http://www.python.org/doc/2.3.5/ref/sequence-types.html, which 
says, for example, that __getitem__(self, key) should raise an 
IndexError if key is not in the container.

However, built-in dicts raise KeyError instead, and http://
www.python.org/doc/2.3.5/lib/module-exceptions.html#l2h-289 
implies that this is the correct behavior.

This appears to be incorrect in the current documentation as well as 
in the 2.3.5 docs.

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>Comment By: Raymond Hettinger (rhettinger)
Date: 2005-08-01 16:54

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Both the behavior and the docs are correct. However,  the
docs are not especially clear on this point.  Will add a
clarifying note that KeyError is the appropriate error for
mapping types when the key is not found.

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