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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Iterating over `enum.Flag` types ignores zero-valued in Python 3.11","articleBody":"# Bug report\n\n### Bug description:\n\nIn Python 3.10, you can iterate over `enum.Enum` and `enum.Flag` types to yield their values.\n\n```python\n\u003e\u003e\u003e import sys; print(sys.version)\n3.10.12 | packaged by conda-forge | (main, Jun 23 2023, 22:40:32) [GCC 12.3.0]\n\n\u003e\u003e\u003e import enum\n\u003e\u003e\u003e class MyEnum(enum.Enum):\n...     A = 0\n...     B = 1\n...     C = 2\n...\n\u003e\u003e\u003e list(MyEnum)\n[\u003cMyEnum.A: 0\u003e, \u003cMyEnum.B: 1\u003e, \u003cMyEnum.C: 2\u003e]\n\n\u003e\u003e\u003e class MyFlag(enum.Flag):\n...     A = 0\n...     B = 1\n...     C = 2\n...\n\u003e\u003e\u003e list(MyFlag)\n[\u003cMyFlag.A: 0\u003e, \u003cMyFlag.B: 1\u003e, \u003cMyFlag.C: 2\u003e]\n```\n\nIn Python 3.11, the same is true for `enum.Enum` types, but the behavior seems to have changed for `enum.Flag` types. Now, iterating over the type only yields its nonzero values.\n\n```python\n\u003e\u003e\u003e import sys; print(sys.version)\n3.11.5 | packaged by conda-forge | (main, Aug 27 2023, 03:34:09) [GCC 12.3.0]\n\n\u003e\u003e\u003e import enum\n\u003e\u003e\u003e class MyEnum(enum.Enum):\n...     A = 0\n...     B = 1\n...     C = 2\n...\n\u003e\u003e\u003e list(MyEnum)\n[\u003cMyEnum.A: 0\u003e, \u003cMyEnum.B: 1\u003e, \u003cMyEnum.C: 2\u003e]\n\n\u003e\u003e\u003e class MyFlag(enum.Flag):\n...     A = 0\n...     B = 1\n...     C = 2\n...\n\u003e\u003e\u003e list(MyFlag)\n[\u003cMyFlag.B: 1\u003e, \u003cMyFlag.C: 2\u003e]  # Missing \u003cMyFlag.A: 0\u003e (!)\n```\n\n\n### CPython versions tested on:\n\n3.10, 3.11\n\n### Operating systems tested on:\n\nLinux","author":{"url":"https://github.com/gmgunter","@type":"Person","name":"gmgunter"},"datePublished":"2023-09-21T01:16:53.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/109633/cpython/issues/109633"}