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Pending removal in Python 3.14

  • The ma_version_tag field in :c:type:`PyDictObject` for extension modules (PEP 699; :gh:`101193`).

  • Creating :c:data:`immutable types <Py_TPFLAGS_IMMUTABLETYPE>` with mutable bases (:gh:`95388`).

  • Functions to configure Python's initialization, deprecated in Python 3.11:

    • :c:func:`!PySys_SetArgvEx()`: Set :c:member:`PyConfig.argv` instead.
    • :c:func:`!PySys_SetArgv()`: Set :c:member:`PyConfig.argv` instead.
    • :c:func:`!Py_SetProgramName()`: Set :c:member:`PyConfig.program_name` instead.
    • :c:func:`!Py_SetPythonHome()`: Set :c:member:`PyConfig.home` instead.

    The :c:func:`Py_InitializeFromConfig` API should be used with :c:type:`PyConfig` instead.

  • Global configuration variables:

    • :c:var:`Py_DebugFlag`: Use :c:member:`PyConfig.parser_debug` instead.
    • :c:var:`Py_VerboseFlag`: Use :c:member:`PyConfig.verbose` instead.
    • :c:var:`Py_QuietFlag`: Use :c:member:`PyConfig.quiet` instead.
    • :c:var:`Py_InteractiveFlag`: Use :c:member:`PyConfig.interactive` instead.
    • :c:var:`Py_InspectFlag`: Use :c:member:`PyConfig.inspect` instead.
    • :c:var:`Py_OptimizeFlag`: Use :c:member:`PyConfig.optimization_level` instead.
    • :c:var:`Py_NoSiteFlag`: Use :c:member:`PyConfig.site_import` instead.
    • :c:var:`Py_BytesWarningFlag`: Use :c:member:`PyConfig.bytes_warning` instead.
    • :c:var:`Py_FrozenFlag`: Use :c:member:`PyConfig.pathconfig_warnings` instead.
    • :c:var:`Py_IgnoreEnvironmentFlag`: Use :c:member:`PyConfig.use_environment` instead.
    • :c:var:`Py_DontWriteBytecodeFlag`: Use :c:member:`PyConfig.write_bytecode` instead.
    • :c:var:`Py_NoUserSiteDirectory`: Use :c:member:`PyConfig.user_site_directory` instead.
    • :c:var:`Py_UnbufferedStdioFlag`: Use :c:member:`PyConfig.buffered_stdio` instead.
    • :c:var:`Py_HashRandomizationFlag`: Use :c:member:`PyConfig.use_hash_seed` and :c:member:`PyConfig.hash_seed` instead.
    • :c:var:`Py_IsolatedFlag`: Use :c:member:`PyConfig.isolated` instead.
    • :c:var:`Py_LegacyWindowsFSEncodingFlag`: Use :c:member:`PyPreConfig.legacy_windows_fs_encoding` instead.
    • :c:var:`Py_LegacyWindowsStdioFlag`: Use :c:member:`PyConfig.legacy_windows_stdio` instead.
    • :c:var:`!Py_FileSystemDefaultEncoding`: Use :c:member:`PyConfig.filesystem_encoding` instead.
    • :c:var:`!Py_HasFileSystemDefaultEncoding`: Use :c:member:`PyConfig.filesystem_encoding` instead.
    • :c:var:`!Py_FileSystemDefaultEncodeErrors`: Use :c:member:`PyConfig.filesystem_errors` instead.
    • :c:var:`!Py_UTF8Mode`: Use :c:member:`PyPreConfig.utf8_mode` instead. (see :c:func:`Py_PreInitialize`)

    The :c:func:`Py_InitializeFromConfig` API should be used with :c:type:`PyConfig` instead.