Irit Katriel <iritkatr...@gmail.com> added the comment:
This seems fixed in 3.11:
>>> from collections import defaultdict
>>> '{foo}{bar}'.format(**defaultdict(str))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
KeyError: 'foo'
----------
nosy: +iritkatriel
status: open -> pending
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue18531>
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