Name already in use

Fix a race condition in the internal `multiprocessing.process` cleanup
logic that could manifest as an unintended `AttributeError` when calling
`BaseProcess.close()`.

---------

Co-authored-by: Oleg Iarygin <oleg@arhadthedev.net>
Co-authored-by: Gregory P. Smith <greg@krypto.org>

…ching (#104696)

…thod (#104729)

* Support for conversion specifiers o (octal) and X (uppercase hexadecimal).
* Support for length modifiers j (intmax_t) and t (ptrdiff_t).
* Length modifiers are now applied to all integer conversions.
* Support for wchar_t C strings (%ls and %lV).
* Support for variable width and precision (*).
* Support for flag - (left alignment).

Annotate methods of the following classes:

- class Function
- class Parameter
- class LandMine

)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

…s New (#104542)

Co-authored-by: Paul Ganssle <1377457+pganssle@users.noreply.github.com>

Co-authored-by: Petr Viktorin <encukou@gmail.com>

- AnyStr can be used in type annotations, contrary to the section header
- Unpack can also be used in annotations, and its use is not restricted
  to generics. It makes more sense with other building blocks like Required.
- Protocol is not necessarily generic.

Also fix the indentation for two notes associated with Concatenate.

Split off from #104642, but I think this change is independently an
improvement.

…4468)

Co-authored-by: Aniket Panse <aniketpanse@fb.com>
Co-authored-by: Gregory P. Smith <greg@krypto.org>
Co-authored-by: Carl Meyer <carl@oddbird.net>

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

This commit replaces the Python implementation of the tokenize module with an implementation
that reuses the real C tokenizer via a private extension module. The tokenize module now implements
a compatibility layer that transforms tokens from the C tokenizer into Python tokenize tokens for backward
compatibility.

As the C tokenizer does not emit some tokens that the Python tokenizer provides (such as comments and non-semantic newlines), a new special mode has been added to the C tokenizer mode that currently is only used via
the extension module that exposes it to the Python layer. This new mode forces the C tokenizer to emit these new extra tokens and add the appropriate metadata that is needed to match the old Python implementation.

Co-authored-by: Pablo Galindo <pablogsal@gmail.com>

bpo-17258:  `multiprocessing` now supports stronger HMAC algorithms for inter-process connection authentication rather than only HMAC-MD5.

Signed-off-by: Christian Heimes <christian@python.org>

gpshead: I Reworked to be more robust while keeping the idea.

The protocol modification idea remains, but we now take advantage of the
message length as an indicator of legacy vs modern protocol version.  No
more regular expression usage.  We now default to HMAC-SHA256, but do so
in a way that will be compatible when communicating with older clients
or older servers. No protocol transition period is needed.

More integration tests to verify these claims remain true are required. I'm
unaware of anyone depending on multiprocessing connections between
different Python versions.

---------

Signed-off-by: Christian Heimes <christian@python.org>
Co-authored-by: Gregory P. Smith [Google] <greg@krypto.org>

…4701)

(this adjusts new code) raise RuntimeError if provided config file is invalid or empty, not ValueError.

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

- Make some string interpolations more readable using f-strings or
  explicit parametrisation
- Remove unneeded open() mode specifiers

Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>

…ollection is undefined (#104699)

…104697)

Use non-Raw malloc for c_fds_to_keep as the code could ask for 0 length.

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
Co-authored-by: Oleg Iarygin <oleg@arhadthedev.net>

…gs (#104660)

…movesuffix` (#104685)

Both methods were new in Python 3.9.

The following local variables were assigned but never used:

- line 551:  result
- line 1341: groups
- line 1431: default_return_converter
- line 1529: ignore_self
- line 1809: input_checksum
- line 4224: new'

---

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

For code readability. Instances of `builtins.dict` have been ordered since 3.6, and have been guaranteed by the language to be ordered since Python 3.7. Argument Clinic now requires Python 3.10+.