Bugs item #1614429, was opened at 2006-12-12 20:48
Message generated for change (Comment added) made by rhettinger
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Category: None
Group: None
>Status: Closed
>Resolution: Duplicate
Priority: 5
Private: No
Submitted By: toidinamai (toidinamai)
Assigned to: Nobody/Anonymous (nobody)
Summary: dict throwing inaccurate KeyError on small tuple keys
Initial Comment:
When using tuples of length one as keys for the builtin
dictionary the Python runtime raises an inaccurate
KeyError exception that makes some errors hard to find:
Python 2.5 (r25:51908, Dec 12 2006, 18:39:30)
[GCC 4.1.1 (Gentoo 4.1.1-r1)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> {"foo":"bar"}[("foo",)]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
KeyError: 'foo'
Also the error messages for the empty tuple and None are
indistinguishable:
Python 2.5 (r25:51908, Dec 12 2006, 18:39:30)
[GCC 4.1.1 (Gentoo 4.1.1-r1)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> {None:"bar"}[()]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
KeyError
>>> {():"bar"}[None]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
KeyError
This also seems to be the case for earlier versions of Python.
----------------------------------------------------------------------
>Comment By: Raymond Hettinger (rhettinger)
Date: 2006-12-12 21:46
Message:
Logged In: YES
user_id=80475
Originator: NO
This is a duplicate of bug #1576657 when Georg just fixed.
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