[issue21237] Update Python 2/3 porting HOWTO's suggestion for dealing with map()

[Josh Rosenberg]

Josh Rosenberg added the comment:

I think the suggestion is intended for "how do I keep Python 2 semantics in Python 3?", not "how can I write my Python 2 code so it will run equivalently in Python 3?"

It wouldn't be a bad idea to point out that you can adopt Py3 semantics initially so as to avoid surprises later on; sadly, unlike a __future__ import, if you want cross compatible code you have to do stupid stuff like:

try:
    from future_builtins import *
except ImportError:
    # Py3 is already the future
    pass

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nosy: +josh.rosenberg

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