bpo-44210: make importlib.metadata._meta.PackageMetadata public

[FFY00]

Signed-off-by: Filipe Laíns [email protected]

https://bugs.python.org/issue44210

Automerge-Triggered-By: GH:jaraco

[jaraco]

This looks good. It just needs to go into the backport too. I'll use this PR to illustrate how I accomplish that.

[miss-islington]

Thanks @FFY00 for the PR 🌮🎉.. I'm working now to backport this PR to: 3.10.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!

[bedevere-bot]

GH-26320 is a backport of this pull request to the 3.10 branch.

[jaraco]

Now that the PR is merged, the commit is stable in CPython, so I can target that commit to cherry-pick into importlib_metadata.

[jaraco]

From the importlib_metadata checkout main branch, I fetch the cpython repo (this pulls in a lifetime of commits).

importlib_metadata main $ git fetch gh://python/cpython main
remote: Enumerating objects: 723658, done.
remote: Counting objects: 100% (300/300), done.
remote: Compressing objects: 100% (178/178), done.
remote: Total 723658 (delta 153), reused 225 (delta 122), pack-reused 723358
Receiving objects: 100% (723658/723658), 315.34 MiB | 9.07 MiB/s, done.
Resolving deltas: 100% (577353/577353), done.
From https://github.com/python/cpython
 * branch                    main       -> FETCH_HEAD

Because importlib_metadata has a cpython branch, it is aware of the mapping from Lib/importlib/metadata to importlib_metadata, so in some cases (and indeed this one), simply cherry-picking the commit will work:

importlib_metadata main $ git cherry-pick df7eeacd83f531dd67cec7bc483dec6dce17ddbd
Auto-merging importlib_metadata/__init__.py
[main f91fe6da3fc] [bpo-44210](https://bugs.python.org/issue44210): make importlib.metadata._meta.PackageMetadata public (GH-26299)
 Author: Filipe Laíns <[email protected]>
 Date: Sun May 23 20:04:05 2021 +0100
 2 files changed, 3 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2021-05-21-21-23-43.[bpo-44210](https://bugs.python.org/issue44210).5afQ3K.rst

But, we don't want the 'Misc' file, so remove it:

importlib_metadata main $ rm -r Misc
importlib_metadata main $ git commit -a --amend --no-edit
[main 786c7440e53] [bpo-44210](https://bugs.python.org/issue44210): make importlib.metadata._meta.PackageMetadata public (GH-26299)
 Author: Filipe Laíns <[email protected]>
 Date: Sun May 23 20:04:05 2021 +0100
 1 file changed, 2 insertions(+)

Now push that commit (python/importlib_metadata@786c7440e53):

importlib_metadata main $ git push
Enumerating objects: 7, done.
Counting objects: 100% (7/7), done.
Delta compression using up to 8 threads
Compressing objects: 100% (4/4), done.
Writing objects: 100% (4/4), 534 bytes | 534.00 KiB/s, done.
Total 4 (delta 3), reused 0 (delta 0), pack-reused 0
remote: Resolving deltas: 100% (3/3), completed with 3 local objects.
To https://github.com/python/importlib_metadata
   a956dc531d0..786c7440e53  main -> main

Optionally, consider cleaning up all those CPython commits with git gc.