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Replace _Py_IDENTIFIER() with statically initialized objects. #90699

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ericsnowcurrently opened this issue Jan 26, 2022 · 29 comments
Open

Replace _Py_IDENTIFIER() with statically initialized objects. #90699

ericsnowcurrently opened this issue Jan 26, 2022 · 29 comments
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3.12 interpreter-core

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@ericsnowcurrently
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@ericsnowcurrently ericsnowcurrently commented Jan 26, 2022

BPO 46541
Nosy @vstinner, @tiran, @ericsnowcurrently, @serhiy-storchaka, @corona10, @erlend-aasland, @kumaraditya303, @notarealdeveloper
PRs
  • #30928
  • #30941
  • #31261
  • #31344
  • #31346
  • #31351
  • #31358
  • #31363
  • #31364
  • #31372
  • #31375
  • #31376
  • #30310
  • #31468
  • #31475
  • #31599
  • #31608
  • #31609
  • #31683
  • #32063
  • Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = 'https://github.com/ericsnowcurrently'
    closed_at = None
    created_at = <Date 2022-01-26.22:01:04.421>
    labels = ['interpreter-core', '3.11']
    title = 'Replace _Py_IDENTIFIER() with statically initialized objects.'
    updated_at = <Date 2022-03-23.15:52:58.371>
    user = 'https://github.com/ericsnowcurrently'

    bugs.python.org fields:

    activity = <Date 2022-03-23.15:52:58.371>
    actor = 'eric.snow'
    assignee = 'eric.snow'
    closed = False
    closed_date = None
    closer = None
    components = ['Interpreter Core']
    creation = <Date 2022-01-26.22:01:04.421>
    creator = 'eric.snow'
    dependencies = []
    files = []
    hgrepos = []
    issue_num = 46541
    keywords = ['patch']
    message_count = 28.0
    messages = ['411799', '411800', '411910', '411987', '412229', '412405', '412488', '412868', '413047', '413086', '413246', '413274', '413311', '413312', '413323', '413333', '413334', '413337', '413355', '413374', '413384', '413653', '414178', '414182', '414265', '414274', '414534', '415881']
    nosy_count = 8.0
    nosy_names = ['vstinner', 'christian.heimes', 'eric.snow', 'serhiy.storchaka', 'corona10', 'erlendaasland', 'kumaraditya', 'notarealdeveloper']
    pr_nums = ['30928', '30941', '31261', '31344', '31346', '31351', '31358', '31363', '31364', '31372', '31375', '31376', '30310', '31468', '31475', '31599', '31608', '31609', '31683', '32063']
    priority = 'normal'
    resolution = None
    stage = 'patch review'
    status = 'open'
    superseder = None
    type = None
    url = 'https://bugs.python.org/issue46541'
    versions = ['Python 3.11']

    @ericsnowcurrently
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    @ericsnowcurrently ericsnowcurrently commented Jan 26, 2022

    _Py_Identifier has been useful but at this point there is a faster and simpler approach we could take as a replacement: statically initialize the objects as fields on _PyRuntimeState and reference them directly through a macro.

    This would involve the following:

    • add a PyUnicodeObject field (not a pointer) to _PyRuntimeStatefor each string that currently uses_Py_IDENTIFIER()`
    • initialize each object as part of the static initializer for _PyRuntimeState
    • make each "immortal" (e.g. start with a really high refcount)
    • add a macro to look up a given string
    • update each location that currently uses _Py_IDENTIFIER() to use the new macro instead

    As part of this, we would also do the following:

    • get rid of all C-API functions with _Py_Identifer parameters
    • get rid of the old runtime state related to identifiers
    • get rid of _Py_Identifier, _Py_IDENTIFIER(), etc.

    (Note that there are several hundred uses of _Py_IDENTIFIER(), including a number of duplicates.)

    Pros:

    • reduces indirection (and extra calls) for C-API using the strings (making the code easier to understand and speeding it up)
    • the objects are referenced from a fixed address in the static data section (speeding things up and allowing the C compiler to optimize better)
    • there is no lazy allocation (or lookup, etc.) so there are fewer possible failures when the objects get used (thus less error return checking)
    • simplifies the runtime state
    • saves memory (at little, at least)
    • the approach for per-interpreter is simpler (if needed)
    • reduces the number of static variables in any given C module
    • reduces the number of functions in the ("private") C-API
    • "deep frozen" modules can use these strings
    • other commonly-used strings could be pre-allocated by adding _PyRuntimeState fields for them

    Cons:

    • churn
    • adding a string to the list requires modifying a separate file from the one where you actually want to use the string
    • strings can get "orphaned" (we could prevent this with a check in make check)
    • some PyPI packages may rely on _Py_IDENTIFIER() (even though it is "private" C-API)
    • some strings may never get used for any given ./python invocation

    Note that with a basic partial implementation (GH-30928) I'm seeing a 1% improvement in performance (see faster-cpython/ideas#230).

    @ericsnowcurrently ericsnowcurrently self-assigned this Jan 26, 2022
    @ericsnowcurrently ericsnowcurrently added interpreter-core 3.11 labels Jan 26, 2022
    @ericsnowcurrently ericsnowcurrently self-assigned this Jan 26, 2022
    @ericsnowcurrently ericsnowcurrently added the interpreter-core label Jan 26, 2022
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    @ericsnowcurrently ericsnowcurrently commented Jan 26, 2022

    ## Background ##

    _Py_Identifier (and _Py_IDENTIFIER(), etc.) was added in 2011 [1][2] for several reasons:

    • provide a consistent approach for a common optimization: caching C-string based string objects
    • facilitate freeing those objects during runtime finalization

    The solution involved using a static variable defined, using _Py_IDENTIFIER() near the code that needed the string. The variable (a _Py_Identifier) would hold the desired C string (statically initialized) and the corresponding (lazily created) PyUnicodeObject. The code where the _Py_Identifier was defined would then pass it to specialized versions of various C-API that would normally consume a C string or PyUnicodeObject. Then that code would use either the C-string or the object (creating and caching it first if not done already). This approach decentralized the caching but also provided a single tracking mechanism that made it easier to clean up the objects.

    Over the last decade a number of changes were made, including recent changes to make the identifiers per-interpreter and to use a centralized cache.

    [1] afe55bb
    [2] https://mail.python.org/archives/list/python-dev@python.org/message/FRUTTE47JO2XN3LXV2J4VB5A5VILILLA/

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    @ericsnowcurrently ericsnowcurrently commented Jan 27, 2022

    New changeset 247480a by Eric Snow in branch 'main':
    bpo-46541: Generate the global objects initializer. (gh-30941)
    247480a

    @vstinner
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    @vstinner vstinner commented Jan 28, 2022

    _Py_Identifier has been useful but at this point there is a faster and simpler approach we could take as a replacement: statically initialize the objects as fields on _PyRuntimeState and reference them directly through a macro.

    This change is going to break projects in the wild. Yes, people use the _Py_IDENTIFIER(), _PyUnicode_FromId() and other "Id" variant of many functions in 3rd party projects.

    Is it possible to keep runtime initialization if this API is used by 3rd party code?

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    @ericsnowcurrently ericsnowcurrently commented Feb 1, 2022

    If necessary, we can keep _Py_IDENTIFIER() (and the functions). Regardless, we can stop using it internally.

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    @ericsnowcurrently ericsnowcurrently commented Feb 2, 2022

    FYI, I've posted to python-dev for feedback before proceeding:

    https://mail.python.org/archives/list/python-dev@python.org/thread/DNMZAMB4M6RVR76RDZMUK2WRLI6KAAYS/

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    @ericsnowcurrently ericsnowcurrently commented Feb 4, 2022

    (thanks Victor: https://mail.python.org/archives/list/python-dev@python.org/message/7RMLIJHUWVBZFV747TFEHOE6LNBVQSMM/)

    3rd party use of _Py_IDENTIFIER():

    All of them should be trivial to drop _Py_IDENTIFIER() without any real performance impact or mess.

    Also, the following implies that PyPy has some sort of _Py_IDENTIFIER() support: https://github.com/benhoyt/scandir/blob/3396aa4155ffde8600a0e9ca50d5872569169b5d/_scandir.c#L51.

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    @ericsnowcurrently ericsnowcurrently commented Feb 8, 2022

    New changeset 81c7204 by Eric Snow in branch 'main':
    bpo-46541: Replace core use of _Py_IDENTIFIER() with statically initialized global objects. (gh-30928)
    81c7204

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    @lazka lazka mannequin commented Feb 11, 2022

    Sorry if off topic, but I noticed that CPython doesn't deprecate macros in code, while with gcc/clang it's possible to show compiler warnings for them using some pragma magic:

    $ gcc a.c
    a.c: In function 'main':
    a.c:29:13: warning: Deprecated pre-processor symbol
       29 |     PySomethingDeprecated (0);
          |             ^~~~~~~~~~~~~~~~~~
    a.c:30:13: warning: Deprecated pre-processor symbol: replace with "SomethingCompletelyDifferent"
       30 |     PySomethingDeprecated2 (42);
          |             ^~~~~~~~~~~~~~~~~~~~

    Here is how glib implements this for example: https://gist.github.com/lazka/4749c74249a3918a059d944040aca4a3

    Maybe that makes getting rid of them easier in the long run?

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    @ericsnowcurrently ericsnowcurrently commented Feb 11, 2022

    On Fri, Feb 11, 2022 at 1:36 AM Christoph Reiter <report@bugs.python.org> wrote:

    Sorry if off topic, but I noticed that CPython doesn't deprecate macros in code, while with gcc/clang it's possible to show compiler warnings for them using some pragma magic:
    [snip]
    Maybe that makes getting rid of them easier in the long run?

    That's a good question. We do have Py_DEPRECATED() (in
    Include/pyport.h), which is used for symbols. I'm not sure anyone has
    given much thought to deprecating macros, but it's probably worth
    considering. I recommend that you post something about this to
    python-dev@python.org.

    FWIW, here are other explanations of how to deprecate macros:

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    @ericsnowcurrently ericsnowcurrently commented Feb 14, 2022

    With core code sorted out, stdlib and 3rd party extension modules are left to sort out.

    I see the following possibilities:

    1. leave _Py_IDENTIFIER() alone (it is already disallowed in core code)
    2. change _Py_IDENTIFIER() to create static string objects (then get rid of global state)
    3. get rid of _Py_IDENTIFIER()
      a. provide a public alternative (needs a PEP)
      b. first work with 3rd party projects to stop using it

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    @ericsnowcurrently ericsnowcurrently commented Feb 15, 2022

    New changeset 12360aa by Eric Snow in branch 'main':
    bpo-46541: Discover the global strings. (gh-31346)
    12360aa

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    @ericsnowcurrently ericsnowcurrently commented Feb 16, 2022

    New changeset 6c89589 by Eric Snow in branch 'main':
    bpo-46541: Drop the check for orphaned global strings. (gh-31363)
    6c89589

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    @ericsnowcurrently ericsnowcurrently commented Feb 16, 2022

    New changeset 4d8a515 by Eric Snow in branch 'main':
    bpo-46541: Scan Fewer Files in generate_global_objects.py (gh-31364)
    4d8a515

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    @corona10 corona10 commented Feb 16, 2022

    New changeset e59309b by Dong-hee Na in branch 'main':
    bpo-46541: Remove usage of _Py_IDENTIFIER from dbms modules (GH-31358)
    e59309b

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    @corona10 corona10 commented Feb 16, 2022

    New changeset d64f3ca by Dong-hee Na in branch 'main':
    bpo-46541: Remove usage of _Py_IDENTIFIER from csv module (GH-31372)
    d64f3ca

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    @corona10 corona10 commented Feb 16, 2022

    New changeset b207711 by Erlend Egeberg Aasland in branch 'main':
    bpo-46541: Replace _Py_IDENTIFIER with _Py_ID in sqlite3 (GH-31351)
    b207711

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    @corona10 corona10 commented Feb 16, 2022

    New changeset e8a19b0 by Dong-hee Na in branch 'main':
    bpo-46541: Remove usage of _Py_IDENTIFIER from mmap module (GH-31375)
    e8a19b0

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    @ericsnowcurrently ericsnowcurrently commented Feb 16, 2022

    (from #31376 (comment))

    [corona10]

    Should we create the separate bpo issue if module changes are too noisy?

    I think it's fine to use the one issue. There are only 26 modules with NEEDS_PY_IDENTIFIER and none have much risk with the change. So it's unlikely that we'll get any discussion about any specific module. If we do, we can easily create an issue then for the module in question. If one of the modules had many uses of _Py_IDENTIFIER() then it might make sense to split it out, but IIRC none of them have very many.

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    @corona10 corona10 commented Feb 17, 2022

    I think it's fine to use the one issue.

    Great! and thank you for all your efforts :)

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    @corona10 corona10 commented Feb 17, 2022

    New changeset 8cb5f70 by Dong-hee Na in branch 'main':
    bpo-46541: Remove usage of _Py_IDENTIFIER from array module (GH-31376)
    8cb5f70

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    @corona10 corona10 commented Feb 21, 2022

    New changeset 2b86616 by Dong-hee Na in branch 'main':
    bpo-46541: Remove usage of _Py_IDENTIFIER from pyexpat (GH-31468)
    2b86616

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    @tiran tiran commented Feb 28, 2022

    New changeset 088dd76 by Dong-hee Na in branch 'main':
    bpo-46541: Remove unnecessary Py_VISIT (GH-31608)
    088dd76

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    @corona10 corona10 commented Feb 28, 2022

    New changeset c32aef4 by Erlend Egeberg Aasland in branch 'main':
    bpo-46541: Remove unneeded visits from sqlite3 (GH-31609)
    c32aef4

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    @corona10 corona10 commented Mar 4, 2022

    New changeset d168c72 by Dong-hee Na in branch 'main':
    bpo-46541: Remove usage of _Py_IDENTIFIER from lzma module (GH-31683)
    d168c72

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    @ericsnowcurrently ericsnowcurrently commented Mar 23, 2022

    New changeset 21412d0 by Eric Snow in branch 'main':
    bpo-46541: Add a Comment About When to Use _Py_DECLARE_STR(). (gh-32063)
    21412d0

    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
    corona10 added a commit to corona10/cpython that referenced this issue Apr 19, 2022
    serhiy-storchaka added a commit that referenced this issue Jun 26, 2022
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    * [docs] fix some asyncio.Barrier.wait docs grammar (GH-93552)
    
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    Co-authored-by: Łukasz Langa <lukasz@langa.pl>
    
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    Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
    Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
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    * gh-93421: Update sqlite3 cursor.rowcount only after SQLITE_DONE (#93526)
    
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    All install targets use the "all" target as synchronization point to
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    "test" targets now correctly compile PGO build in a clean repo.
    
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    * Remove outdated notes from functions that aren't in the Limited API
    
    Nowadays everything that *is* in the Limited API has a note added
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    * Also remove forgotten note on tp_vectorcall_offset not being finalized
    
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    * gh-93575: Use correct way to calculate PyUnicode struct sizes (GH-93602)
    
    * gh-93575: Use correct way to calculate PyUnicode struct sizes
    
    * Add comment to keep test_sys and test_unicode in sync
    
    * Fix case code < 256
    
    * gh-90473: Define HOSTRUNNER for WASI (GH-93606)
    
    * gh-79096: Fix/improve http cookiejar tests (GH-93614)
    
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    * bpo-45383: Get metaclass from bases in PyType_From* (GH-28748)
    
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    Co-authored-by: Petr Viktorin <encukou@gmail.com>
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    Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
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    * gh-93671: Avoid exponential backtracking in deeply nested sequence patterns in match statements (GH-93680)
    
    Co-authored-by: Łukasz Langa <lukasz@langa.pl>
    
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    * GH-93621: reorder code in with/async-with exception exit path to reduce the size of the exception table (GH-93622)
    
    * gh-93461: Invalidate sys.path_importer_cache entries with relative paths (GH-93653)
    
    * gh-91317: Document that Path does not collapse initial `//` (GH-32193)
    
    
    
    Documentation for `pathlib` says:
    
    > Spurious slashes and single dots are collapsed, but double dots ('..') are not, since this would change the meaning of a path in the face of symbolic links:
    
    However, it omits that initial double slashes also aren't collapsed.
    
    Later, in documentation of `PurePath.drive`, `PurePath.root`, and `PurePath.name` it mentions UNC but:
    
    - this abbreviation says nothing to a person who is unaware about existence of UNC (Wikipedia doesn't help either by [giving a disambiguation page](https://en.wikipedia.org/wiki/UNC))
    - it shows up only if a person needs to use a specific property or decides to fully learn what the module provides.
    
    For context, see the BPO entry.
    
    * gh-92886: Fix tests that fail when running with optimizations (`-O`) in `test_zipimport.py` (GH-93236)
    
    * gh-92930: _pickle.c: Acquire strong references before calling save() (GH-92931)
    
    * gh-84461: Use HOSTRUNNER to run regression tests (GH-93694)
    
    Co-authored-by: Brett Cannon <brett@python.org>
    
    * gh-90473: Skip test_queue when threading is not available (GH-93712)
    
    * gh-90153:  whatsnew: "z" option in format spec (GH-93624)
    
    Add what's new entry for PEP 682 in Python 3.11.
    
    * gh-86404: [doc] A make sucpicious false positive. (GH-93710)
    
    * Change list to view object (#93661)
    
    * gh-84508: tool to generate cjk traditional chinese mappings (gh-93272)
    
    * Remove usage of _Py_IDENTIFIER from math module (#93739)
    
    * gh-91162: Support splitting of unpacked arbitrary-length tuple over TypeVar and TypeVarTuple parameters (alt) (GH-93412)
    
    For example:
    
      A[T, *Ts][*tuple[int, ...]] -> A[int, *tuple[int, ...]]
      A[*Ts, T][*tuple[int, ...]] -> A[*tuple[int, ...], int]
    
    * gh-93728: fix memory leak in deepfrozen code objects (GH-93729)
    
    * gh-93747: Fix Refleak when handling multiple Py_tp_doc slots (gh-93749)
    
    * GH-90699: use statically allocated strings in typeobject.c (gh-93751)
    
    * Add more FOR_ITER specialization stats (GH-32151)
    
    * gh-89653: PEP 670: Convert PyFunction macros (#93765)
    
    Convert PyFunction macros to static inline functions.
    
    * Remove ANY_VARARGS() macro from the C API (#93764)
    
    The macro was exposed by mistake.
    
    * gh-84623: Remove unused imports in stdlib (#93773)
    
    * gh-91731: Don't define 'static_assert' in C++11 where is a keyword to avoid UB (GH-93700)
    
    * gh-84623: Remove unused imports in tests (#93772)
    
    * gh-93353: Fix importlib.resources._tempfile() finalizer (#93377)
    
    Fix the importlib.resources.as_file() context manager to remove the
    temporary file if destroyed late during Python finalization: keep a
    local reference to the os.remove() function. Patch by Victor Stinner.
    
    * gh-84461: Fix parallel testing on WebAssembly (GH-93768)
    
    * gh-89653: PEP 670: Macros always cast arguments in cpython/ (#93766)
    
    Header files in the Include/cpython/ are only included if
    the Py_LIMITED_API macro is not defined.
    
    * gh-93353: Add test.support.late_deletion() (#93774)
    
    * gh-93741: Add private C API _PyImport_GetModuleAttrString() (GH-93742)
    
    It combines PyImport_ImportModule() and PyObject_GetAttrString()
    and saves 4-6 lines of code on every use.
    
    Add also _PyImport_GetModuleAttr() which takes Python strings as arguments.
    
    * gh-79512: Fixed names and __module__ value of weakref classes (GH-93719)
    
    Classes ReferenceType, ProxyType and CallableProxyType have now correct
    atrtributes __module__, __name__ and __qualname__.
    It makes them (types, not instances) pickleable.
    
    * gh-91810: Fix regression with writing an XML declaration with encoding='unicode' (GH-93426)
    
    Suppress writing an XML declaration in open files in ElementTree.write()
    with encoding='unicode' and xml_declaration=None.
    
    If file patch is passed to ElementTree.write() with encoding='unicode',
    always open a new file in UTF-8.
    
    * gh-93761: Fix test to avoid simple delay when synchronizing. (GH-93779)
    
    * gh-89546: Clean up PyType_FromMetaclass (GH-93686)
    
    
    
    When changing PyType_FromMetaclass recently (GH-93012, GH-93466, GH-28748)
    I found a bunch of opportunities to improve the code. Here they are.
    
    Fixes: #89546
    
    Automerge-Triggered-By: GH:encukou
    
    * gh-91321: Fix compatibility with C++ older than C++11 (#93784)
    
    Fix the compatibility of the Python C API with C++ older than C++11.
    
    _Py_NULL is only defined as nullptr on C++11 and newer.
    
    * GH-93662: Make sure that column offsets are correct in multi-line method calls. (GH-93673)
    
    * GH-93516: Store offset of first traceable instruction in code object (GH-93769)
    
    * gh-90473: Include stdlib dir in wasmtime PYTHONPATH (GH-93797)
    
    * GH-93429: Merge `LOAD_METHOD` back into `LOAD_ATTR` (GH-93430)
    
    * gh-93353: regrtest checks for leaked temporary files (#93776)
    
    When running tests with -jN, create a temporary directory per process
    and mark a test as "environment changed" if a test leaks a temporary
    file or directory.
    
    * gh-79579: Improve DML query detection in sqlite3 (#93623)
    
    The fix involves using pysqlite_check_remaining_sql(), not only to check
    for multiple statements, but now also to strip leading comments and
    whitespace from SQL statements, so we can improve DML query detection.
    
    pysqlite_check_remaining_sql() is renamed lstrip_sql(), to more
    accurately reflect its function, and hardened to handle more SQL comment
    corner cases.
    
    * GH-93678: reduce boilerplate and code repetition in the compiler (GH-93682)
    
    * gh-91877: Fix WriteTransport.get_write_buffer_{limits,size} docs (#92338)
    
    - Amend docs for WriteTransport.get_write_buffer_limits
    - Add docs for WriteTransport.get_write_buffer_size
    
    * GH-93429: Document `LOAD_METHOD` removal (GH-93803)
    
    * Include freelists in allocation total. (GH-93799)
    
    * gh-93795: Use test.support TESTFN/unlink in sqlite3 tests (#93796)
    
    * Remove LOAD_METHOD stats. (GH-93807)
    
    * Rename 'LOAD_METHOD' specialization stat consts to 'ATTR'. (GH-93812)
    
    * gh-93353: Fix regrtest for -jN with N >= 2 (GH-93813)
    
    * [docs] Fix LOAD_ATTR version changed (GH-93816)
    
    * gh-93814: Add infinite test for itertools.chain.from_iterable (GH-93815)
    
    
    
    fix #93814
    
    Automerge-Triggered-By: GH:rhettinger
    
    * gh-93735: Split Docs CI to speed-up the build (GH-93736)
    
    * gh-93183: Adjust wording in socket docs (#93832)
    
    package => packet
    
    Co-authored-by: Victor Norman
    
    * gh-93829: In sqlite3, replace Py_BuildValue with faster APIs (#93830)
    
    - In Modules/_sqlite/connection.c, use PyLong_FromLong
    - In Modules/_sqlite/microprotocols.c, use PyTuple_Pack
    
    * Add test.support.busy_retry() (#93770)
    
    Add busy_retry() and sleeping_retry() functions to test.support.
    
    * gh-87260: Update sqlite3 signature docs to reflect actual implementation (#93840)
    
    Align the docs for the following methods with the actual implementation:
    
    - sqlite3.complete_statement()
    - sqlite3.Connection.create_function()
    - sqlite3.Connection.create_aggregate()
    - sqlite3.Connection.set_progress_handler()
    
    * test_thread uses support.sleeping_retry() (#93849)
    
    test_thread.test_count() now fails if it takes longer than
    LONG_TIMEOUT seconds.
    
    * Use support.sleeping_retry() and support.busy_retry() (#93848)
    
    * Replace time.sleep(0.010) with sleeping_retry() to
      use an exponential sleep.
    * support.wait_process(): reuse sleeping_retry().
    * _test_eintr: remove unused variables.
    
    * Update includes in call.c (GH-93786)
    
    * gh-93857: Fix broken audit-event targets in sqlite3 docs (#93859)
    
    Corrected targets for the following audit-events:
    
    - sqlite3.enable_load_extension => sqlite3.Connection.enable_load_extension
    - sqlite3.load_extension => sqlite3.Connection.load_extension
    
    * GH-93850: Fix test_asyncio exception ignored tracebacks (#93854)
    
    * gh-93824: Reenable installation of shell extension on Windows ARM64 (GH-93825)
    
    * test_asyncio: run_until() implements exponential sleep (#93866)
    
    run_until() of test.test_asyncio.utils now uses an exponential sleep
    delay (max: 1 second), rather than a fixed delay of 1 ms. Similar
    design than support.sleeping_retry() wait strategy that applies
    exponential backoff.
    
    * test_asyncore: Optimize capture_server() (#93867)
    
    Remove time.sleep(0.01) in test_asyncore capture_server(). The sleep
    was redundant and inefficient, since the loop starts with
    select.select() which also implements a sleep (poll for socket data
    with a timeout).
    
    * Tests call sleeping_retry() with SHORT_TIMEOUT (#93870)
    
    Tests now call busy_retry() and sleeping_retry() with SHORT_TIMEOUT
    or LONG_TIMEOUT (of test.support), rather than hardcoded constants.
    
    Add also WAIT_ACTIVE_CHILDREN_TIMEOUT constant to
    _test_multiprocessing.
    
    * gh-84461: Document how to install SDKs manually (GH-93844)
    
    Co-authored-by: Brett Cannon <brett@python.org>
    
    * gh-93820: Fix copy() regression in enum.Flag (GH-93876)
    
    
    
    GH-26658 introduced a regression in copy / pickle protocol for combined
    `enum.Flag`s. `copy.copy(re.A | re.I)` would fail with
    `AttributeError: ASCII|IGNORECASE`.
    
    `enum.Flag` now has a `__reduce_ex__()` method that reduces flags by
    combined value, not by combined name.
    
    * Call busy_retry() and sleeping_retry() with error=True (#93871)
    
    Tests no longer call busy_retry() and sleeping_retry() with
    error=False: raise an exception if the loop times out.
    
    * gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815)
    
    * gh-91321: Fix test_cppext for C++03 (#93902)
    
    Don't build _testcppext.cpp with -Wzero-as-null-pointer-constant when
    testing C++03: only use this compiler flag with C++11.
    
    * gh-91577: SharedMemory move imports out of methods (#91579)
    
    SharedMemory.unlink() uses the unregister() function from resource_tracker. Previously it was imported in the method, but this can fail if the method is called during interpreter shutdown, for example when unlink is part of a __del__() method.
    
    Moving the import to the top of the file, means that the unregister() method is available during interpreter shutdown.
    
    The register call in SharedMemory.__init__() can also use this imported resource_tracker.
    
    * gh-92547: Amend What's New (#93872)
    
    * Fix BINARY_SUBSCR_GETITEM stats (GH-93903)
    
    * gh-93847: Fix repr of enum of generic aliases (GH-93885)
    
    * gh-93353: regrtest supports checking tmp files with -j2 (#93909)
    
    regrtest now also implements checking for leaked temporary files and
    directories when using -jN for N >= 2. Use tempfile.mkdtemp() to
    create the temporary directory. Skip this check on WASI.
    
    * GH-91389: Fix dis position information for CACHEs (GH-93663)
    
    * gh-91985: Ensure in-tree builds override platstdlib_dir in every path calculation (GH-93641)
    
    * GH-83658: make multiprocessing.Pool raise an exception if maxtasksperchild is not None or a positive int (GH-93364)
    
    
    
    Closes #83658.
    
    * test_logging: Fix BytesWarning in SysLogHandlerTest (GH-93920)
    
    * gh-91404: Revert "bpo-23689: re module, fix memory leak when a match is terminated by a signal or allocation failure (GH-32283) (#93882)
    
    Revert "bpo-23689: re module, fix memory leak when a match is terminated by a signal or memory allocation failure (GH-32283)"
    
    This reverts commit 6e3eee5.
    
    Manual fixups to increase the MAGIC number and to handle conflicts with
    a couple of changes that landed after that.
    
    Thanks for reviews by Ma Lin and Serhiy Storchaka.
    
    * gh-89745: Avoid exact match when comparing program_name in test_embed on Windows (GH-93888)
    
    * gh-93852: Add test.support.create_unix_domain_name() (#93914)
    
    test_asyncio, test_logging, test_socket and test_socketserver now
    create AF_UNIX domains in the current directory to no longer fail
    with OSError("AF_UNIX path too long") if the temporary directory (the
    TMPDIR environment variable) is too long.
    
    Modify the following tests to use create_unix_domain_name():
    
    * test_asyncio
    * test_logging
    * test_socket
    * test_socketserver
    
    test_asyncio.utils: remove unused time import.
    
    * gh-77782: Py_FdIsInteractive() now uses PyConfig.interactive (#93916)
    
    * gh-74953: Add _PyTime_FromMicrosecondsClamp() function (#93942)
    
    * gh-74953: Fix PyThread_acquire_lock_timed() code recomputing the timeout (#93941)
    
    Set timeout, don't create a local variable with the same name.
    
    * gh-77782: Deprecate global configuration variable (#93943)
    
    Deprecate global configuration variable like
    Py_IgnoreEnvironmentFlag: the Py_InitializeFromConfig() API should be
    instead.
    
    Fix declaration of Py_GETENV(): use PyAPI_FUNC(), not PyAPI_DATA().
    
    * gh-93911: Specialize `LOAD_ATTR_PROPERTY` (GH-93912)
    
    * gh-92888: Fix memoryview bad `__index__` use after free (GH-92946)
    
    Co-authored-by: chilaxan <35645806+chilaxan@users.noreply.github.com>
    Co-authored-by: Serhiy Storchaka <3659035+serhiy-storchaka@users.noreply.github.com>
    
    * GH-89858: Fix test_embed for out-of-tree builds (GH-93465)
    
    * gh-92611: Add details on replacements for cgi utility funcs (GH-92792)
    
    
    
    Per @brettcannon 's [suggestions on the Discourse thread](https://discuss.python.org/t/pep-594-take-2-removing-dead-batteries-from-the-standard-library/13508/51), discussed in #92611 and as a followup to PR #92612 , this PR add additional specific per-function replacement information for the utility functions in the `cgi` module deprecated by PEP 594 (PEP-594).
    
    @brettcannon , should this be backported (without the `deprecated-removed` , which I would update it accordingly and re-add in my other PR adding that to the others for 3.11+), or just go in 3.11+?
    
    * GH-77403: Fix tests which fail when PYTHONUSERBASE is not normalized (GH-93917)
    
    * gh-91387: Strip trailing slash from tarfile longname directories (GH-32423)
    
    Co-authored-by: Brett Cannon <brett@python.org>
    
    * Add jaraco as primary owner of importlib.metadata and importlib.resources. (#93960)
    
    * Add jaraco as primary owner of importlib.metadata and importlib.resources.
    
    * Align indentation.
    
    Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
    
    Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
    
    * gh-84461: Fix circulare dependency on BUILDPYTHON (GH-93977)
    
    * gh-89828: Do not relay the __class__ attribute in GenericAlias (#93754)
    
    list[int].__class__ returned type, and isinstance(list[int], type)
    returned True. It caused numerous problems in code that checks
    isinstance(x, type).
    
    * gh-84461: Fix pydebug Emscripten browser builds (GH-93982)
    
    wasm_assets script did not take the ABIFLAG flag of sysconfigdata into
    account.
    
    * gh-93955: Use unbound methods for slot `__getattr__` and `__getattribute__` (GH-93956)
    
    * gh-91387: Fix tarfile test on WASI (GH-93984)
    
    WASI's rmdir() syscall does not like the trailing slash.
    
    * gh-93975: Nicer error reporting in test_venv (GH-93959)
    
    
    
    - gh-93957: Provide nicer error reporting from subprocesses in test_venv.EnsurePipTest.test_with_pip.
    - Update changelog
    
    This change does three things:
    
    1. Extract a function for trapping output in subprocesses.
    2. Emit both stdout and stderr when encountering an error.
    3. Apply the change to `ensurepip._uninstall` check.
    
    * GH-93990: fix refcounting bug in `add_subclass` in `typeobject.c` (GH-93989)
    
    * What's new in 3.10: fix link to issue (#93968)
    
    * What's new in 3.10: fix link to issue
    
    * What's new in 3.10: fix link to GH issue
    
    Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
    
    Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
    
    * gh-93761: Fix test_logging test_config_queue_handler() race condition (#93952)
    
    Fix a race condition in test_config_queue_handler() of test_logging.
    
    * gh-74953: Reformat PyThread_acquire_lock_timed() (#93947)
    
    Reformat the pthread implementation of PyThread_acquire_lock_timed()
    using a mutex and a conditioinal variable.
    
    * Add goto to avoid multiple indentation levels and exit quickly
    * Use "while(1)" and make the control flow more obvious.
    * PEP 7: Add braces around if blocks.
    
    * gh-93937, C API: Move PyFrame_GetBack() to Python.h (#93938)
    
    Move the follow functions and type from frameobject.h to pyframe.h,
    so the standard <Python.h> provide frame getter functions:
    
    * PyFrame_Check()
    * PyFrame_GetBack()
    * PyFrame_GetBuiltins()
    * PyFrame_GetGenerator()
    * PyFrame_GetGlobals()
    * PyFrame_GetLasti()
    * PyFrame_GetLocals()
    * PyFrame_Type
    
    Remove #include "frameobject.h" from many C files. It's no longer
    needed.
    
    * gh-93991: Use boolean instead of 0/1 for condition check (GH-93992)
    
    
    
    # gh-93991: Use boolean instead of 0/1 for condition check
    
    * gh-84461: Fix Emscripten umask and permission issues (GH-94002)
    
    - Emscripten's default umask is too strict, see
      emscripten-core/emscripten#17269
    - getuid/getgid and geteuid/getegid are stubs that always return 0
      (root). Disable effective uid/gid syscalls and fix tests that use
      chmod() current user.
    - Cannot drop X bit from directory.
    
    * gh-84461: Skip test_unwritable_directory again on Emscripten (GH-94007)
    
    GH-93992 removed geteuid() and enabled the test again on Emscripten.
    
    * gh-93925: Improve clarity of sqlite3 commit/rollback, and close docs (#93926)
    
    Co-authored-by: CAM Gerlach <CAM.Gerlach@Gerlach.CAM>
    
    * gh-61162: Clarify sqlite3 connection context manager docs (GH-93890)
    
    
    
    Explicitly note that transactions are only closed if there is an open
    transation at `__exit__`, and that transactions are not implicitly
    opened during `__enter__`.
    
    Co-authored-by: CAM Gerlach <CAM.Gerlach@Gerlach.CAM>
    Co-authored-by: Stanley <46876382+slateny@users.noreply.github.com>
    
    Automerge-Triggered-By: GH:erlend-aasland
    
    * gh-79009: sqlite3.iterdump now correctly handles tables with autoincrement (#9621)
    
    Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>
    
    * gh-84461: Silence some compiler warnings on WASM (GH-93978)
    
    * GH-93897: Store frame size in code object and de-opt if insufficient space on thread frame stack. (GH-93908)
    
    * GH-93516: Speedup line number checks when tracing. (GH-93763)
    
    * Use a lookup table to reduce overhead of getting line numbers during tracing.
    
    * gh-90539: doc: Expand on what should not go into CFLAGS, LDFLAGS (#92754)
    
    * gh-87347: Add parenthesis around macro arguments (#93915)
    
    Add unit test on Py_MEMBER_SIZE() and some other macros.
    
    * gh-93937: PyOS_StdioReadline() uses PyConfig.legacy_windows_stdio (#94024)
    
    On Windows, PyOS_StdioReadline() now gets
    PyConfig.legacy_windows_stdio from _PyOS_ReadlineTState, rather than
    using the deprecated global Py_LegacyWindowsStdioFlag variable.
    
    Fix also a compiler warning in Py_SetStandardStreamEncoding().
    
    * GH-93249: relax overly strict assertion on bounds->ar_start (GH-93961)
    
    * gh-94021: Address unreachable code warning in specialize code (GH-94022)
    
    * GH-93678: refactor compiler so that optimizer does not need the assembler and compiler structs (GH-93842)
    
    * gh-93839: Move Lib/ctypes/test/ to Lib/test/test_ctypes/ (#94041)
    
    * Move Lib/ctypes/test/ to Lib/test/test_ctypes/
    * Remove Lib/test/test_ctypes.py
    * Update imports and build system.
    
    * gh-93839: Move Lib/unttest/test/ to Lib/test/test_unittest/ (#94043)
    
    * Move Lib/unittest/test/ to Lib/test/test_unittest/
    * Remove Lib/test/test_unittest.py
    * Replace unittest.test with test.test_unittest
    * Remove unittest.load_tests()
    * Rewrite unittest __init__.py and __main__.py
    * Update build system, CODEOWNERS, and wasm_assets.py
    
    * GH-91432: Specialize FOR_ITER (GH-91713)
    
    * Adds FOR_ITER_LIST and FOR_ITER_RANGE specializations.
    
    * Adds _PyLong_AssignValue() internal function to avoid temporary boxing of ints.
    
    * gh-94028: Clear and reset sqlite3 statements properly in cursor iternext (GH-94042)
    
    * gh-94052: Don't re-run failed tests with --python option (#94054)
    
    * gh-93839: Use load_package_tests() for testmock (GH-94055)
    
    
    
    Fixes failing tests on WebAssembly platforms.
    
    Automerge-Triggered-By: GH:tiran
    
    * gh-54781: Move Lib/lib2to3/tests/ to Lib/test/test_lib2to3/ (#94049)
    
    * Move Lib/lib2to3/tests/ to Lib/test/test_lib2to3/.
    * Remove Lib/test/test_lib2to3.py.
    * Update imports.
    * all_project_files(): use different paths and sort files
      to make the tests more reproducible.
    * Update references to tests.
    
    * gh-74953: _PyThread_cond_after() uses _PyTime_t (#94056)
    
    pthread _PyThread_cond_after() implementation now uses the _PyTime_t
    type to handle properly overflow: clamp to the maximum value.
    
    Remove MICROSECONDS_TO_TIMESPEC() function.
    
    * GH-93841: Allow stats to be turned on and off, cleared and dumped at runtime. (GH-93843)
    
    * gh-86986: Drop compatibility support for Sphinx 2 (GH-93737)
    
    * Revert "bpo-42843: Keep Sphinx 1.8 and Sphinx 2 compatibility (GH-24282)"
    
    This reverts commit 5c1f15b
    
    * Revert "bpo-42579: Make workaround for various versions of Sphinx more robust (GH-23662)"
    
    This reverts commit b63a620.
    
    * gh-94068: Remove HVSOCKET_CONTAINER_PASSTHRU constant because it has been removed from Windows (GH-94069)
    
    
    
    Fixes #94068
    
    Automerge-Triggered-By: GH:zware
    
    * Closes gh-94038: Update Release Schedule in README.rst from PEP 664 to PEP 693 (GH-94046)
    
    * gh-93851: Fix all broken links in Doc/ (GH-93853)
    
    * gh-93675: Fix typos in `Doc/` (GH-93676)
    
    Closes #93675
    
    * Minor optimization for Fractions.limit_denominator (GH-93730)
    
    When we construct the upper and lower candidates in limit_denominator,
    the numerator and denominator are already relatively prime (and the
    denominator positive) by construction, so there's no need to go through
    the usual normalisation in the constructor. This saves a couple of
    potentially expensive gcd calls.
    
    Suggested by Michael Scott Asato Cuthbert in GH-93477.
    
    * gh-93240: clarify wording in IO tutorial (GH-93276)
    
    Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
    
    * Tutorial: specify match cases don't fall through (GH-93615)
    
    * gh-93021: Fix __text_signature__ for __get__ (GH-93023)
    
    Because of the way wrap_descr_get is written, the second argument
    to __get__ methods implemented through the wrapper is always
    optional.
    
    * gh-82927: Update files related to HTML entities. (GH-92504)
    
    * DOC: correct bytesarray -> bytearray in comments (GH-92410)
    
    * gh-87389: Fix an open redirection vulnerability in http.server. (#93879)
    
    Fix an open redirection vulnerability in the `http.server` module when
    an URI path starts with `//` that could produce a 301 Location header
    with a misleading target.  Vulnerability discovered, and logic fix
    proposed, by Hamza Avvan (@hamzaavvan).
    
    Test and comments authored by Gregory P. Smith [Google].
    
    * gh-89336: Remove configparser APIs that were deprecated for 3.12 (#92503)
    
    https://github.com/python/cpython/issue/89336: Remove configparser 3.12 deprecations.
    
    Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>
    
    * bpo-30535: [doc] state that sys.meta_path is not empty by default (GH-94098)
    
    Co-authored-by: Windson yang <wiwindson@outlook.com>
    
    * gh-88123: Implement new Enum __contains__ (GH-93298)
    
    Co-authored-by: Ethan Furman <ethan@stoneleaf.us>
    
    * Stats: Add summary of top instructions for misses and deferred specialization. (GH-94072)
    
    * gh-74696: Do not change the current working directory in shutil.make_archive() if possible (GH-93160)
    
    It is no longer changed when create a zip or tar archive.
    
    It is still changed for custom archivers registered with shutil.register_archive_format()
    if root_dir is not None.
    
    Co-authored-by: Éric <merwok@netwok.org>
    Co-authored-by: Łukasz Langa <lukasz@langa.pl>
    
    * gh-94101 Disallow instantiation of SSLSession objects (GH-94102)
    
    
    
    Fixes #94101
    
    Automerge-Triggered-By: GH:tiran
    
    * Fix typo in _io.TextIOWrapper Clinic input (#94037)
    
    Co-authored-by: Łukasz Langa <lukasz@langa.pl>
    
    * gh-93951: In test_bdb.StateTestCase.test_skip, avoid including auxiliary importers. (GH-93962)
    
    Co-authored-by: Brett Cannon <brett@python.org>
    
    * gh-91172: Create a workflow for verifying bundled pip and setuptools (GH-31885)
    
    Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>
    Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
    
    * gh-94114: Remove obsolete reference to python.org mirrors (GH-94115)
    
    
    
    * gh-94114
    
    * gh-84623: Remove unused imports (#94132)
    
    * gh-54781: Move Lib/tkinter/test/test_ttk/ to Lib/test/test_ttk/ (#94070)
    
    * Move Lib/tkinter/test/test_tkinter/ to Lib/test/test_tkinter/.
    * Move Lib/tkinter/test/test_ttk/ to Lib/test/test_ttk/.
    * Add Lib/test/test_ttk/__init__.py based on test_ttk_guionly.py.
    * Add Lib/test/test_tkinter/__init__.py
    * Remove old Lib/test/test_tk.py.
    * Remove old Lib/test/test_ttk_guionly.py.
    * Add __main__ sub-modules.
    * Update imports and update references to rename files.
    
    * gh-84623: Move imports in doctests (#94133)
    
    Move imports in doctests to prevent false alarms in pyflakes.
    
    * Add ABI dump Makefile target (#94136)
    
    * gh-84623: Remove unused imports in idlelib (#94143)
    
    Remove commented code in test_debugger_r.py.
    
    Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
    
    * gh-85308: argparse: Use filesystem encoding for arguments file (GH-93277)
    
    * Closes gh-94152: Update pyvideo.org URL (GH-94075)
    
    The URL is now https://pyvideo.org, which uses HTTPS and avoids a redirect.
    
    * gh-91456: [Enum] Deprecate default auto() behavior with mixed value types (GH-91457)
    
    When used with plain Enum, auto() returns the last numeric value assigned, skipping any incompatible member values (such as strings); starting in 3.13 the default auto() for plain Enums will require all the values to be of compatible types, and will return a new value that is 1 higher than any existing value.
    
    Co-authored-by: Ethan Furman <ethan@stoneleaf.us>
    
    * gh-84461: Fix test_sqlite for Emscripten/WASI (#94125)
    
    * gh-86404: [doc] Fix missing backtick and double target name. (#94120)
    
    * gh-89121: Keep the number of pending SQLite statements to a minimum (#30379)
    
    Make sure statements that have run to completion or errored are
    reset and cleared off the cursor for all paths in execute() and
    executemany().
    
    * GH-91742: Fix pdb crash after jump  (GH-94171)
    
    * [Enum] fix typo (GH-94158)
    
    * gh-92858: Improve error message for some suites with syntax error before ':' (#92894)
    
    * gh-93771: Clarify how deepfreeze.py is run (#94150)
    
    * gh-91219: Add an index_pages default list and parameter to SimpleHTTPRequestHandler (GH-31985)
    
    * Add an index_pages default list to SimpleHTTPRequestHandler and an
    optional constructor parameter that allows the default indexes pages
    list to be overridden.  This makes it easy to set a new index page name
    without having to override send_head.
    
    * [Enum] Remove automatic docstring generation (GH-94188)
    
    * Add ABI dump script (#94135)
    
    * Add more tests for throwing into yield from (GH-94097)
    
    * gh-94169: Remove deprecated io.OpenWrapper (#94170)
    
    Remove io.OpenWrapper and _pyio.OpenWrapper, deprecated in Python
    3.10: just use :func:`open` instead. The open() (io.open()) function
    is a built-in function. Since Python 3.10, _pyio.open() is also a
    static method.
    
    * gh-94199: Remove ssl.RAND_pseudo_bytes() function (#94202)
    
    Remove the ssl.RAND_pseudo_bytes() function, deprecated in Python
    3.6: use os.urandom() or ssl.RAND_bytes() instead.
    
    * gh-94196: Remove gzip.GzipFile.filename attribute (#94197)
    
    gzip: Remove the filename attribute of gzip.GzipFile,
    deprecated since Python 2.6, use the name attribute instead. In write
    mode, the filename attribute added '.gz' file extension if it was not
    present.
    
    * gh-93692: remove "build finished successfully" message from setup.py (#93693)
    
    The message was only emitted when the build succeeded _and_ there were
    missing modules.
    
    * gh-84461: Fix ctypes and test_ctypes on Emscripten (#94142)
    
    - c_longlong and c_longdouble need experimental WASM bigint.
    - Skip tests that need threading
    - Define ``CTYPES_MAX_ARGCOUNT`` for Emscripten. libffi-emscripten 2022-06-23 supports up to 1000 args.
    
    * gh-94205: Ensures all required DLLs are copied on Windows for underpth tests (GH-94206)
    
    * gh-84461: Build Emscripten with WASM BigInt support (#94219)
    
    * gh-94172: urllib.request avoids deprecated check_hostname (#94193)
    
    The urllib.request no longer uses the deprecated check_hostname
    parameter of the http.client module.
    
    Add private http.client._create_https_context() helper to http.client,
    used by urllib.request.
    
    Remove the now redundant check on check_hostname and verify_mode in
    http.client: the SSLContext.check_hostname setter already implements
    the check.
    
    * IDLE: replace if statement with expression (#94228)
    
    * Docs: Remove `Provides [...]` from `multiprocessing.shared_memory` description (#92761)
    
    * gh-93382: Sync up `co_code` changes with 3.11 (GH-94227)
    
    Sync up co_code changes with 3.11 commit 852b4d4.
    
    * gh-94217: Skip import tests when _testcapi is a builtin (GH-94218)
    
    * gh-85308: Add argparse tests for reading non-ASCII arguments from file (GH-94160)
    
    * bpo-46642: Explicitly disallow subclassing of instaces of TypeVar, ParamSpec, etc (GH-31148)
    
    The existing test covering this case passed only incidentally. We
    explicitly disallow doing this and add a proper error message.
    
    Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
    
    * bpo-26253: Add compressionlevel to tarfile stream (GH-2962)
    
    `tarfile` already accepts a compressionlevel argument for creating
    files. This patch adds the same for stream-based tarfile usage.
    The default is 9, the value that was previously hard-coded.
    
    * gh-70441: Fix test_tarfile on systems w/o bz2 (gh-2962) (#94258)
    
    * gh-94199: Remove ssl.match_hostname() function (#94224)
    
    * gh-94207: Fix struct module leak (GH-94239)
    
    Make _struct.Struct a GC type
    
    This fixes a memory leak in the _struct module, where as soon
    as a Struct object is stored in the cache, there's a cycle from
    the _struct module to the cache to Struct objects to the Struct
    type back to the module. If _struct.Struct is not gc-tracked, that
    cycle is never collected.
    
    This PR makes _struct.Struct GC-tracked, and adds a regression test.
    
    * gh-94245: Test pickling and copying of typing.Tuple[()] (GH-94259)
    
    * gh-77560: Report possible errors in restoring builtins at finalization (GH-94255)
    
    Seems in the past the copy of builtins was not made in some scenarios,
    and the error was silenced. Write it now to stderr, so we have a chance
    to see it.
    
    * gh-90016: Reword sqlite3 adapter/converter docs (#93095)
    
    Also add adapters and converter recipes.
    
    Co-authored-by: CAM Gerlach <CAM.Gerlach@Gerlach.CAM>
    Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com
    
    * bpo-39971: Change examples to be runnable (GH-32172)
    
    * gh-70474: [doc] fix wording of GET_ANEXT doc (GH-94048)
    
    * gh-93259: Validate arg to ``Distribution.from_name``. (GH-94270)
    
    Syncs with importlib_metadata 4.12.0.
    
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    miss-islington pushed a commit that referenced this issue Jul 8, 2022
    This is similar to how strings are interned for deepfreeze.
    @kumaraditya303
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    @kumaraditya303 kumaraditya303 commented Jul 9, 2022

    With #93597, the global identifier strings are interned and now can be used in-place of other cached interned strings to avoid allocations and fast comparisons with pointers and sub-interpreter compatible as bonus.

    @kumaraditya303 kumaraditya303 added 3.12 and removed 3.11 labels Jul 9, 2022
    @kumaraditya303 kumaraditya303 self-assigned this Jul 9, 2022
    iritkatriel pushed a commit to iritkatriel/cpython that referenced this issue Jul 19, 2022
    iritkatriel pushed a commit to iritkatriel/cpython that referenced this issue Jul 19, 2022
    This is similar to how strings are interned for deepfreeze.
    miss-islington pushed a commit to miss-islington/cpython that referenced this issue Jul 20, 2022
    …-94850)
    
    (cherry picked from commit 1834133)
    
    Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>
    miss-islington added a commit that referenced this issue Jul 20, 2022
    (cherry picked from commit 1834133)
    
    Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>
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