[ python-Bugs-1576657 ] dict keyerror formatting and tuples

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Bugs item #1576657, was opened at 2006-10-13 18:00
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Category: Python Interpreter Core
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Submitted By: M.-A. Lemburg (lemburg)
Assigned to: Nobody/Anonymous (nobody)
Summary: dict keyerror formatting and tuples

Initial Comment:
Probably just a minor glitch, but one which caused me
half an hour to track down:

>>> d = {1:'x'}
>>> v = (1,)
>>> d[v]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyError: 1

Note the formatting of the error message. It reads '1',
not '(1,)' as you would expect.

The example is constructed. In the code I was
debugging, I didn't know that v was a tuple and thought
it was the integer 1 - so the KeyError itself was
somewhat puzzling.

Only after printing the key I found that the lookup
failed due to a type error.

This happens in Python 2.4 and 2.5.


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