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Weird, but legal ** syntax not accepted #5580
Description
I saw this in real code, although I don't really understand the reason why this is done. Still, even though it's a bit weird, it's legal and I think mypy should allow it:
class Foo:
def __init__(self, a=1, b=2):
self.a = a
self.b = b
Foo(**{})
$ mypy foo.py
foo.py:7: error: Keywords must be strings
Activity
gvanrossum commentedon Sep 6, 2018
Agreed -- the dict could be type-checked here with a context of
Mapping[str, Any]and that would make the empty dict have the typeDict[str, Any]rather thanDict[<nothing>, <nothing>].Low priority though.
Fix argument checking on empty dict with double stars (#9629)