Guido van Rossum <gu...@python.org> added the comment:

There is actually a difference between Any and Optional[Any]. Try the following 
using e.g. mypy:

def f(a: Optional[Any]):
    a+1

def g(a: Any):
    a+1

You'll get an error in f but not in g.

So this behavior is not a bug.

----------
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42288>
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