Remove more Python 2 code leftovers (tool 2to3)

[hartwork]

Follow-up to #1074

CC @bwendling

[bwendling]

After this, do we need the yapflib/py3compat.py file anymore?

[hartwork]

After this, do we need the yapflib/py3compat.py file anymore?

@bwendling it still defines three symbols:

• PY38
• raw_input
• removeBOM

We can move things elsewhere, and then delete the file if you like
The first two symbols seem test-related, the third is used by the core at a single place.

To summarize the two key questions:

• Should the file be resolved by moving the related code?
• If yes, should it be done in here or in a follow-up pull request?

PS: Resolving conflicts in a second…

[bwendling]

Okay, so I suggest moving PY38 and raw_input to the yapftest/ subdirectory and the placing the removeBOM into the file using it. That should be done as a separate PR.

Thank you!

[hartwork]

@bwendling sounds good, PR upcoming…