Pending Removal in Python 3.14

• The ma_version_tag field in PyDictObject for extension modules (PEP 699; gh-101193).

• Creating immutable types with mutable bases (gh-95388).

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

  • PySys_SetArgvEx(): Set PyConfig.argv instead.

  • PySys_SetArgv(): Set PyConfig.argv instead.

  • Py_SetProgramName(): Set PyConfig.program_name instead.

  • Py_SetPythonHome(): Set PyConfig.home instead.

  The Py_InitializeFromConfig() API should be used with PyConfig instead.

• Global configuration variables:

  • Py_DebugFlag: Use PyConfig.parser_debug instead.

  • Py_VerboseFlag: Use PyConfig.verbose instead.

  • Py_QuietFlag: Use PyConfig.quiet instead.

  • Py_InteractiveFlag: Use PyConfig.interactive instead.

  • Py_InspectFlag: Use PyConfig.inspect instead.

  • Py_OptimizeFlag: Use PyConfig.optimization_level instead.

  • Py_NoSiteFlag: Use PyConfig.site_import instead.

  • Py_BytesWarningFlag: Use PyConfig.bytes_warning instead.

  • Py_FrozenFlag: Use PyConfig.pathconfig_warnings instead.

  • Py_IgnoreEnvironmentFlag: Use PyConfig.use_environment instead.

  • Py_DontWriteBytecodeFlag: Use PyConfig.write_bytecode instead.

  • Py_NoUserSiteDirectory: Use PyConfig.user_site_directory instead.

  • Py_UnbufferedStdioFlag: Use PyConfig.buffered_stdio instead.

  • Py_HashRandomizationFlag: Use PyConfig.use_hash_seed and PyConfig.hash_seed instead.

  • Py_IsolatedFlag: Use PyConfig.isolated instead.

  • Py_LegacyWindowsFSEncodingFlag: Use PyPreConfig.legacy_windows_fs_encoding instead.

  • Py_LegacyWindowsStdioFlag: Use PyConfig.legacy_windows_stdio instead.

  • Py_FileSystemDefaultEncoding: Use PyConfig.filesystem_encoding instead.

  • Py_HasFileSystemDefaultEncoding: Use PyConfig.filesystem_encoding instead.

  • Py_FileSystemDefaultEncodeErrors: Use PyConfig.filesystem_errors instead.

  • Py_UTF8Mode: Use PyPreConfig.utf8_mode instead. (see Py_PreInitialize())

  The Py_InitializeFromConfig() API should be used with PyConfig instead.