gh-92647: [Enum] use final status to determine lookup or create #99500
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ethanfurman
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CuriousLearner
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Nov 16, 2022
* main: (8272 commits) Update Windows readme.txt to clarify Visual Studio required versions (pythonGH-99522) pythongh-99460 Emscripten trampolines on optimized METH_O and METH_NOARGS code paths (python#99461) pythongh-92647: [Enum] use final status to determine lookup or create (pythonGH-99500) pythongh-81057: Move Globals in Core Code to _PyRuntimeState (pythongh-99496) Post 3.12.0a2 pythongh-99300: Use Py_NewRef() in Python/Python-ast.c (python#99499) pythongh-93649: Split pytime and datetime tests from _testcapimodule.c (python#99494) pythongh-99370: fix test_zippath_from_non_installed_posix (pythonGH-99483) pythonGH-99205: remove `_static` field from `PyThreadState` and `PyInterpreterState` (pythonGH-99385) pythongh-81057: Move the Remaining Import State Globals to _PyRuntimeState (pythongh-99488) pythongh-87604: Avoid publishing list of active per-interpreter audit hooks via the gc module (pythonGH-99373) pythongh-93649: Split getargs tests from _testcapimodule.c (python#99346) pythongh-81057: Move Global Variables Holding Objects to _PyRuntimeState. (pythongh-99487) pythonGH-98219: reduce sleep time in `asyncio` subprocess test (python#99464) pythonGH-99388: add `loop_factory` parameter to `asyncio.run` (python#99462) pythongh-99300: Use Py_NewRef() in PC/ directory (python#99479) pythongh-99300: Use Py_NewRef() in Doc/ directory (python#99480) pythongh-99300: Use Py_NewRef() in Modules/ directory (python#99473) pythongh-99300: Use Py_NewRef() in Modules/ directory (python#99469) pythongh-99370: Calculate zip path from prefix when in a venv (pythonGH-99371) ...
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Using call syntax with an Enum has two possibilities:
creating a new enum from a previous enum (good for inheriting behavior, etc.)
looking up a member in a final enum
Which should be used is determined by the number of arguments: one means lookup, more than one means creation. However, if the enum was created using multiple values, and the lookup call erroneously passes multiple values instead of one tuple with those multiple values, then the creation branch is chosen and the resulting error message is less than useful.
Which branch to take is now determined by whether the enum is final (has members).