In class HelpFormatter, class _Section, format_help(self)
(lines 199 & 200), the two lines

            for func, args in self.items:
                func(*args)

aren't necessary; the results of func are ignored.
"func" is applied (again) on the next line when the
output is joined into item_help.

Cheers
.a

Removed the duplicated code from argparse.py

Remove extra code in argparse.py for 2.7 branch

I have added a patch for default branch as well, because IMO the same issue exists in all branches

I guess that was simple enough. I am new to this issue tracker for Cpython. How will the patch review/commit proceed?

I was wondering about that block of code earlier.

It would be a good idea to look at what func() does, just to make sure there aren't any side effects - e.g. set maximum line length, required indention, etc.

New changeset be3874cf87f3 by Berker Peksag in branch 'default':
Issue #17940: Remove redundant code from _Section.format_help()
https://hg.python.org/cpython/rev/be3874cf87f3

Thanks!