bug#63622: lisp/progmodes/python.el: performance regression introduced by multiline font-lock

[Tom Gillespie]

> Is that so?  As far as I have tried, f-string does not seem to be a
> docstring.

Oops. Indeed you are correct. I remember this being an issue in one of my
files as I had to assign to __doc__ manually since of course docstrings do
not require the file to be run for the purposes of extracting documentation.

Best!
Tom