More permissive type for random.choice and related functions

[JelleZijlstra]

It only does len() and [i]:

(3.6)

    def choice(self, seq):
        """Choose a random element from a non-empty sequence."""
        try:
            i = self._randbelow(len(seq))
        except ValueError:
            raise IndexError('Cannot choose from an empty sequence') from None
        return seq[i]

(3.9)

    def choice(self, seq):
        """Choose a random element from a non-empty sequence."""
        # raises IndexError if seq is empty
        return seq[self._randbelow(len(seq))]

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉