[issue8134] collections.defaultdict gives KeyError with format()

[Greg Jednaszewski]

New submission from Greg Jednaszewski <jednaszewski at gmail.com>:

Found on 2.6.2 and 2.6.4:

I expect that printing an uninitialized variable from a defaultdict should work.  In fact it does with old-style string formatting.  However, when you try to do it with new-style string formatting, it raises a KeyError.

>>> import collections
>>> d = collections.defaultdict(int)
>>> "{foo}".format(d)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyError: 'foo'
>>> "%(foo)d" % d
'0'

----------
components: Library (Lib)
messages: 101025
nosy: jednaszewski
severity: normal
status: open
title: collections.defaultdict gives KeyError with format()
type: behavior
versions: Python 2.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8134>
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