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Declare support for Python 3.10 #2562

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merged 2 commits into from Nov 14, 2021
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Declare support for Python 3.10 #2562

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a6f6815
Declare support for Python 3.10
hugovk Oct 22, 2021
5465fd2
Update CHANGES.md
JelleZijlstra Nov 14, 2021
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1 change: 1 addition & 0 deletions CHANGES.md
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Expand Up @@ -10,6 +10,7 @@
- Add partial support for the match statement. As it's experimental, it's only enabled
when `--target-version py310` is explicitly specified (#2586)
- Add support for parenthesized with (#2586)
- Declare support for Python 3.10 (#2562)
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## 21.10b0

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1 change: 1 addition & 0 deletions setup.py
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Expand Up @@ -104,6 +104,7 @@ def get_long_description() -> str:
"Programming Language :: Python :: 3.7",
"Programming Language :: Python :: 3.8",
"Programming Language :: Python :: 3.9",
"Programming Language :: Python :: 3.10",
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Do we wish to do this before we support all the syntax?

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Good point, probably not!

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We already declare Python 3.9 support without formatting all such syntax (e.g. parenthesised context managers), so I'd support adding this classifier - black does run on 3.10 after all!

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But it crashes if you have the new syntax elements. We don’t crash on context managers. Or has that been fixed? If so, sure. Let’s add away.

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$ cat 1.py
def http_error(status):
    match status:
        case 400:
            return "Bad request"
        case 404:
            return "Not found"
        case 418:
            return "I'm a teapot"
        case _:
            return "Something's wrong with the internet"
$ black 1.py
error: cannot format 1.py: Cannot parse: 2:10:     match status:
Oh no! 💥 💔 💥
1 file failed to reformat.

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No, we do crash on context managers: see #1948, #2318 and

$ cat 2.py
from contextlib import nullcontext
with (
    nullcontext() as a,
    nullcontext() as b,
):
    pass

$ python3.9 2.py
$ black 2.py
error: cannot format 2.py: Cannot parse: 4:18:     nullcontext() as a,
Oh no! 💥 💔 💥
1 file failed to reformat.

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But parenthesized CMs are an undocumented feature in 3.9, not a flagship new feature like pattern matching in 3.10.

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PEP-614 "relaxed grammar restrictions on decorators" is documented in the what's new page, and also crashes.

"Programming Language :: Python :: 3 :: Only",
"Topic :: Software Development :: Libraries :: Python Modules",
"Topic :: Software Development :: Quality Assurance",
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