Sweet! Thanks! I did not know that, and I've no problem with a terminal comma there.

My point stands - I do not think those spaces are superfluous. Consider the following:

    a = 4

    def foo(i: int):
        return "A" * i

    class Spam:
        foo = 4
        bar: int = 6

        def eggs(self, n: int = 5):
            return foo(i=n)

Why is it "i=n" instead of "i = n" when every other use of "=" has spaces?

For this one case of a short function with simple names, okay, I don't always use spaces.

But otherwise I think the lack of spaces makes it the code harder to read, and thus "uglier".