bpo-26120: make pydoc exclude __future__ imports from the data block of the module

[iritkatriel]

https://bugs.python.org/issue26120

[arhadthedev]

Python 2.7 reached end-of-life January 1, 2020. Do we really need to carry __future__ around in pydoc?

[iritkatriel]

Python 2.7 reached end-of-life January 1, 2020. Do we really need to carry __future__ around in pydoc?

The future module is not a 2.7 feature, it's still used (like __annotations__)

[Fidget-Spinner]

This LGTM, but since I never touch pydoc apart from the occasional security fix, I'm refraining from approving.

Also, do we need tests for this? Or does pydoc not test this function at all?

Python 2.7 reached end-of-life January 1, 2020. Do we really need to carry future around in pydoc?

Of course! I still want my from __future__ import braces and from __future__ import barry_as_FLUFL ;-).

That aside, yeah Irit added print_function to test that the code works as intended, but it could be any recent non-2.7 __future__.

[Fidget-Spinner]

I don't think anyone is actively maintaining pydoc. LGTM on my end.