python.el doesn't define `comment-start-skip'

[Davis Herring]

It's implied in newcomment.el that `comment-normalize-vars' should be
called before using the library, which creates `comment-start-skip' if
necessary.  However, many programming modes seem to define it themselves;
cperl-mode uses "#+ *", and the old python-mode.el uses just "# *". 
Should this be added?

Davis

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