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How to do Type hinting with argument default values?

Pretty straightforwardly:

    x: int = 0
This makes sense when you see that the variable production in the Python grammar [0] has been updated to essentially read "either a lone variable or a variable with a type annotation". (I highlighted the relevant line of the grammar for you in the link.)

[0] https://github.com/python/cpython/blob/master/Grammar/Gramma...

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