Use pyga/awpa instead of lib2to3

[bwendling]

pyga/awpa may support Python3 more fully than lib2to3. It would be good to explore this.

[ipfans]

It seems that PyPi version of awpa still missing grammar of Python 3.6. I think we still need to waiting for new version release of awap.

[bwendling]

Do they have a timeline for that?

[pquentin]

See https://bugs.python.org/issue40360: lib2to3 is now deprecated and may not be able to fully parse Python 3.10+. CPython encourages using https://libcst.readthedocs.io/ or https://parso.readthedocs.io/

[kamahen]

LibCST builds on parso. Comparing stars on GitHub:

• https://github.com/PyCQA/redbaron : 457
• LibCST: 423
• parso: 296
• awpa: 10

https://bugs.python.org/issue40360#msg367726 and https://bugs.python.org/issue40360#msg367730

[kamahen]

I suspect that pyga/awpa isn't the best solution (it seems to have lib2to3 underneath it).

I've written up a proposal for augmenting the stdlib ast module; this would of course require some work in yapf as well.
https://mail.python.org/archives/list/python-ideas@python.org/thread/X2HJ6I6XLIGRZDB27HRHIVQC3RXNZAY4/

[Spitfire1900]

Thoughts on pulling in blib2to3? See #1045 (comment) for more discussion.

[Spitfire1900]

This issue should likely be closed in favor of adopting either blib2to3 or migrating to PEP 617 – New PEG parser for CPython

[bwendling]

Closed with 7c408b9.