Eric V. Smith <e...@trueblade.com> added the comment:
The problem with this change is that it wouldn't be backward compatible. I'm
not sure how many people it would affect, but probably more than zero.
>>> str.format('{ 0 }', **{' 0 ': 42})
'42'
>>> str.format('{ }', **{' ': 43})
'43'
Does that mean it can't be changed? Not necessarily, of course.
I agree it's unfortunate that we didn't specify this back with PEP 3101.
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<https://bugs.python.org/issue44355>
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