bug#48998: 28.0.50; pyton readline warning improve

[Ben Schw <benjamin.schwerdtner@gmail.com>]

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See attached patch.
lisp/progmodes/python.el (python-shell-completion-native-turn-on-maybe):
If you just start out with python it is not obvious that "readline" is a
pip package that you can install. And as a new user you will get this
warning because readline is not installed.

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