python / cpython

…GH-23405)

The descriptions of the `codes` and `messages` dictionaries in
`xml.parsers.expat.errors` were swapped, and this commit swaps them
back. For example, `codes` maps string descriptions of errors to numeric
error codes, not the other way around.

)

…H-23968)

Objects which belong to different Tcl interpreters are now always
different, even if they have the same name.

…H-23966)

Tk can internally support bignum even if Tkinter is built without
support of bignum.

Automerge-Triggered-By: GH:zware

…GH-23942)

PR 1/2. Needs backport to 3.9.

This makes warnings and errors from the compiler very prominent so this should help prevent warnings from sneaking into the code base and catch them in review. See https://discuss.python.org/t/using-github-problem-matchers-to-catch-warnings-early/4254 for more details

You can see a demo of this in action here: https://github.com/ammaraskar/cpython/pull/15/files#diff-9ba2eeca0f254ece0a9df4d7cb68e870

GCC and Sphinx matchers have previously been added in GH-18567 and GH-20325, respectively.

The typo did no damage, but it looks suspicious and confusing.
Introduced by GH-23136.

Skip news.

Automerge-Triggered-By: GH:pitrou

…3972)

The `pages` argument default value now reflects the implementation.

…-23838)

…dynamic linked with Tk >= 8.5 (GH-23955)

Call _PyType_Fini() in subinterpreters.

Fix reference leaks in subinterpreters.

Automerge-Triggered-By: GH:jaraco

…le (#23954)

Make the Unicode dictionary of interned strings compatible with
subinterpreters.

Remove the INTERN_NAME_STRINGS macro in typeobject.c: names are
always now interned (even if EXPERIMENTAL_ISOLATED_SUBINTERPRETERS
macro is defined).

_PyUnicode_ClearInterned() now uses PyDict_Next() to no longer
allocate memory, to ensure that the interned dictionary is cleared.

Fix regression introduced in
commit 1baf030: restore removed code
to prevent creating a _curses_panel.panel instance directly.

Make the type attribute lookup cache per-interpreter.

Add private _PyType_InitCache() function, called by PyInterpreterState_New().

Continue to share next_version_tag between interpreters, since static
types are still shared by interpreters.

Remove MCACHE macro: the cache is no longer disabled if the
EXPERIMENTAL_ISOLATED_SUBINTERPRETERS macro is defined.

Make _PyUnicode_FromId() function compatible with subinterpreters.
Each interpreter now has an array of identifier objects (interned
strings decoded from UTF-8).

* Add PyInterpreterState.unicode.identifiers: array of identifiers
  objects.
* Add _PyRuntimeState.unicode_ids used to allocate unique indexes
  to _Py_Identifier.
* Rewrite the _Py_Identifier structure.

Microbenchmark on _PyUnicode_FromId(&PyId_a) with _Py_IDENTIFIER(a):

[ref] 2.42 ns +- 0.00 ns -> [atomic] 3.39 ns +- 0.00 ns: 1.40x slower

This change adds 1 ns per _PyUnicode_FromId() call in average.

…d. (gh-23929)

https://bugs.python.org/issue36876