PEP 563: Mark as Final

[hugovk]

• [ ] Final implementation has been merged (including tests and docs)
• [ ] PEP matches the final implementation
• [ ] Any substantial changes since the accepted version approved by the SC/PEP delegate
• [x] Pull request title in appropriate format (PEP 123: Mark Final)
• [x] Status changed to Final (and Python-Version is correct)
• [ ] Canonical docs/spec linked with a canonical-doc directive (or canonical-pypa-spec, for packaging PEPs)

Helps https://github.com/python/peps/issues/2872.

PEP 563 is listed under "Accepted PEPs (accepted; may not be implemented yet)" but was implemented in Python 3.7:

• https://docs.python.org/3/whatsnew/3.7.html#pep-563-postponed-evaluation-of-annotations

Let's mark it as Final.

Also remove redundant headers and Local Variables footer.

Question

Is there a place to link to canonical docs? Compare PEP 560 in https://github.com/python/peps/pull/3570.

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:books: Documentation preview :books:: https://pep-previews--3571.org.readthedocs.build/

[JelleZijlstra]

I thought it wasn't marked as Final since the __future__ was not turned on (and now won't be, due to PEP 649). So perhaps we should instead mark it as superseded by 649 (but only once it's implemented?).