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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`enum`: Member names accidentally removed from \"invalid enum member name(s)\" message","articleBody":"**Bug report**\r\n\r\nIn acf7403f9baea3ae1119fc6b4a3298522188bf96 (#30582), @ethanfurman changed the \"Invalid enum member name\" error message to \"invalid enum member name(s)\":\r\n\r\nhttps://github.com/python/cpython/blob/b2694ab46997746eae7e913738623b39f6334473/Lib/enum.py#L482-L484\r\n\r\n(This was later reverted in 42a64c03ec5c443f2a5c2ee4284622f5d1f5326c and reintroduced in 83d544b9292870eb44f6fca37df0aa351c4ef83a, but I believe the code to be the same).\r\n\r\nHowever, the commit also removed `{0}` from the format string, thus removing the invalid names from the error messages. As a result, the error message is now less descriptive:\r\n\r\n```pytb\r\n$ python3.10 -c \"import enum; enum.Enum('A', ['mro'])\"\r\nTraceback (most recent call last):\r\n  File \"\u003cstring\u003e\", line 1, in \u003cmodule\u003e\r\n  File \"/usr/lib/python3.10/enum.py\", line 387, in __call__\r\n    return cls._create_(\r\n  File \"/usr/lib/python3.10/enum.py\", line 518, in _create_\r\n    enum_class = metacls.__new__(metacls, class_name, bases, classdict)\r\n  File \"/usr/lib/python3.10/enum.py\", line 208, in __new__\r\n    raise ValueError('Invalid enum member name: {0}'.format(\r\nValueError: Invalid enum member name: mro\r\n```\r\n\r\n```pytb\r\n$ python3.11 -c \"import enum; enum.Enum('A', ['mro'])\"\r\nTraceback (most recent call last):\r\n  File \"\u003cstring\u003e\", line 1, in \u003cmodule\u003e\r\n  File \"/usr/lib/python3.11/enum.py\", line 791, in __call__\r\n    return cls._create_(\r\n           ^^^^^^^^^^^^^\r\n  File \"/usr/lib/python3.11/enum.py\", line 966, in _create_\r\n    return metacls.__new__(metacls, class_name, bases, classdict, boundary=boundary)\r\n           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\n  File \"/usr/lib/python3.11/enum.py\", line 483, in __new__\r\n    raise ValueError('invalid enum member name(s) '.format(\r\n    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\nValueError: invalid enum member name(s) \r\n```\r\n\r\nGiven that the `.format()` is still there, I'm assuming that was an accident.\r\n\r\n(Found by running `flake8` over `Lib/` out of curiosity, see https://github.com/python/cpython/issues/93010#issuecomment-1133402591)\r\n\r\n**Your environment**\r\n\r\n- CPython versions tested on: Python 3.11.0b1\r\n- Operating system and architecture: Archlinux x86_64","author":{"url":"https://github.com/The-Compiler","@type":"Person","name":"The-Compiler"},"datePublished":"2022-05-23T14:40:48.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/93118/cpython/issues/93118"}