Add 3.14 Deprecations

[max-muoto]

Add the following deprecations for 3.14:

• pathlib.PurePath.as_uri deprecation.
• pdb.curframe_locals deprecation.
• asyncio.iscoroutinefunction deprecation.
• codecs.open deprecation.
• os.popen and os.spawn* function deprecations.

[JelleZijlstra]

That's confusing, it's the same method. Also, we don't have an override for Path.as_uri, so people will see this deprecation even if they call the method on a Path.

[max-muoto]

Missed the fact that we didn't have an override: 7eccbac

[max-muoto]

Yeah, the exact snippet from the release notes: pathlib.PurePath.as_uri() is deprecated and will be removed in Python 3.19. Use pathlib.Path.as_uri() instead

[max-muoto]

You can also find a runtime warning: https://github.com/python/cpython/blob/e9b647dd30d22cef465972d898a34c4b1bb6615d/Lib/pathlib/__init__.py#L534

[max-muoto]

3.13 due as - The low overhead dynamic frame locals access added in Python 3.13 by PEP 667 means the frame locals cache reference previously stored in this attribute is no longer needed. Derived debuggers should access pdb.Pdb.curframe.f_locals directly in Python 3.13 and later versions.

[srittau]

It seems that curframe_locals actually does not exist in 3.13, at least according to stubtest. I'm not totally sure what's going on here.

[srittau]

@JelleZijlstra CI fails, at the moment, so we shouldn't merge.

[max-muoto]

@JelleZijlstra @srittau I had to an ignore for curframe_locals as it doesn't always exist at runtime, but CI is passing now.

[srittau]

Looks mostly good, a few final small suggestions below.

[Avasam]

For consideration, in #14074 I'm also unconditionally marking these as deprecated, but @srittau mentionned that

If I understand it correctly, it's sometimes necessary to use this on Python < 3.11, since it supports @coroutine (removed in 3.11), which the inspect version doesn't support.

[max-muoto]

@srittau @Avasam Comments addressed.

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

aiohttp (https://github.com/aio-libs/aiohttp)
+ aiohttp/worker.py:73:44: error: overload def (func: def (*Any, **Any) -> typing.Coroutine[Any, Any, Any]) -> builtins.bool of function asyncio.coroutines.iscoroutinefunction is deprecated: Deprecated in Python 3.14; use inspect.iscoroutinefunction() instead  [deprecated]
+ aiohttp/worker.py:73:44: note: See https://mypy.rtfd.io/en/stable/_refs.html#code-deprecated for more info  [deprecated]

trio (https://github.com/python-trio/trio)
+ src/trio/_path.py:258: error: Argument 1 to "as_uri" of "Path" has incompatible type "trio._path.Path"; expected "pathlib.Path"  [arg-type]