New submission from Carmen Bianca Bakker:
As brief as can be, the following script works in Python 3.4 and Python 3.5:
from collections import defaultdict
mydict = defaultdict(lambda: 'default')
print('{foo}'.format(**mydict))
And prints "default".
In Python 3.6, you get a KeyError for foo.
----------
components: Library (Lib)
messages: 295353
nosy: carmenbianca
priority: normal
severity: normal
status: open
title: str.format no longer accepts unpacked defaultdict for default values
versions: Python 3.6
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30590>
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