There are many special names used in Python core and the stdlib, but absent in the documentation index [1]. If you see names that are defined or used in the module or area maintained by you, please add references to these names to the index and document them if it is needed.

Repeat the lists here.

Module level names used in pydoc:
    __author__
    __credits__
    __date__
    __version__

Module level name used in doctest:
    __test__

Other module level names:
    __about__               (heapq only)
    __copyright__           (many modules)
    __cvsid__               (tarfile only)
    __docformat__           (doctest only)
    __email__               (test_with and test_keywordonlyarg only)
    __libmpdec_version__    (decimal only)
    __status__              (logging only)


type attributes (mostly used in tests):
    __abstractmethods__     (used in abc, functools)
    __base__
    __basicsize__
    __dictoffset__
    __flags__               (used in inspect, copyreg)
    __itemsize__
    __weakrefoffset__

super() attributes:
    __self_class__
    __thisclass__

Used in sqlite:
    __adapt__
    __conform__

Used in ctypes:
    __ctype_be__
    __ctype_le__
    __ctypes_from_outparam__

Used in unittest:
    __unittest_expecting_failure__
    __unittest_skip__
    __unittest_skip_why__

float methods, for testing:
    __getformat__
    __setformat__

Used in IDLE RPC:
    __attributes__
    __methods__

Others:
    __alloc__               (bytearray method)
    __args__                (used in bdb)
    __build_class__         (builtins function, used in eval loop)
    __builtins__            (module attribute)
    __decimal_context__     (used in decimal)
    __exception__           (used in pdb)
    __getinitargs__         (used in pickle, datetime)
    __initializing__        (used in importlib)
    __isabstractmethod__    (function/method/descriptor attribute,
                             used in abc, functools, types)
    __ltrace__              (used in eval loop, never set)
    __members__             (Enum attribute, used in many modules)
    __mp_main__             (used in multiprocessing)
    __new_member__          (Enum attribute, used in enum internally)
    __newobj__              (copyreg function,
                             used in pickle, object.__reduce_ex__)
    __newobj_ex__           (copyreg function,
                             used in pickle, object.__reduce_ex__)
    __objclass__            (descriptor/enum attribute, used in
                             inspect, pydoc, doctest, multiprocessing)
    __prepare__             (metaclass method,
                             used in builtins.__build_class__, types)
    __pycache__             (cache directory name)
    __return__              (used in pdb)
    __signature__           (used in inspect, never set)
    __sizeof__              (standard method, used in sys.getsizeof)
    __slotnames__           (used in object.__getstate__ for caching)
    __text_signature__      (function/method/descriptor attribute,
                             used in inspect)
    __trunc__               (used in math.trunc, int, etc)
    __warningregistry__     (used in warnings)
    __weakref__             (used in weakref)
    __wrapped__             (used in inspect, functools, contextlib,
                             asyncio)


[1] http://bugs.python.org/issue23639

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