[issue21320] dict() allows keyword expansion with integer keys, e.g. dict(**{5:'v'})

[R. David Murray]

R. David Murray added the comment:

2.7 can't be changed for backward compatibility reasons, and python3 enforces the restriction in dict, as you observe.

I don't know if a python2 documentation note is worthwhile, but given the conversations at pycon about adding additional -3 warnings to 2.7, it seems like this is a place such a warning would be justified.

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nosy: +r.david.murray
stage:  -> needs patch

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