PEP 8: Removed references to Python 2

[PythonCHB]

After a brief discussion on python-dev, I've removed all references to Python 2 in PEP 8.

(https://mail.python.org/archives/list/python-dev@python.org/thread/MK7N36L3XCXVY5R4DIIYIDU2W7EGJKZ3/)

There are a few items I'm not totally sure about -- see line by line comments.

Also, it was suggested that we might want to put a note in for folks indicating that they can find Python2 relevant versions in the history. I don't think that necessary, but if anyone else wants to add that, of course they can.

[PythonCHB]

A few notes on things I wasn't sure about.

[hugovk]

Typo and formatting

[gvanrossum]

I'll let you all come to a conclusion, and then as the nominal PEP's author I'd like to have the final say. (I'll ask Barry too.)

[PythonCHB]

@gvanrossum, @warsaw:

I"m not sure if you want anyone else to review, but I believe I've responded to all comments so far.

I think it's ready.

[ambv]

Two nits from me, otherwise LGTM.

[smontanaro]

Before removing all Python 2 references from PEP 8, I suggest a tag or branch be created with a meaningful name, something like "lastpy2pep8". It should be a one-and-done sorry of thing and make it easier for people still maintaining tools which support Python 2 (such as the pep8 app in PyPI) to refer to (or to publish).

[gvanrossum]

I am totally cool with this! Will land now, since it's been quiet here for a while.

[gvanrossum]

Before removing all Python 2 references from PEP 8, I suggest a tag or branch be created with a meaningful name, something like "lastpy2pep8". It should be a one-and-done sorry of thing and make it easier for people still maintaining tools which support Python 2 (such as the pep8 app in PyPI) to refer to (or to publish).

Done!