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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`Enum.__str__` change could be improved in What's New","articleBody":"https://github.com/python/cpython/pull/30582 (in 3.11) introduced a [change](https://github.com/python/cpython/pull/30582/files#diff-007214cd4321f2b3600c085a1b9abe8c6f05662421ff232fb42ee77dafc85920L49) to `Enum.__str__` so that it shows the enum name and the member name, whereas prior it only included the member name.\r\n\r\nThis could be a breaking change in some cases. As an example in real world code, the Azure CLI uses enums for the acceptable values of command-line flags, and then uses `str` on the enum to generate the string that is passed to the subprocess as arguments.\r\n\r\nFor example, this [enum](https://github.com/Azure/azure-cli/blob/dev/src/azure-cli/azure/cli/command_modules/sql/custom.py#L643) is used to define a \"compute model\":\r\n\r\n```\r\nclass ComputeModelType(str, Enum):\r\n\r\n    provisioned = \"Provisioned\"\r\n    serverless = \"Serverless\"\r\n```\r\n\r\nAnd then it's used [here to construct arguments for a subprocess](https://github.com/Azure/azure-cli/blob/dev/src/azure-cli/azure/cli/command_modules/sql/tests/latest/test_sql_commands.py#L857):\r\n\r\n```\r\nself.cmd('sql db update -g {} --server {} --name {} --compute-model {}'\r\n                 .format(resource_group, server, database_name, compute_model_serverless),\r\n```\r\n\r\nThe changelog entry for this change just says:\r\n\r\n```\r\nIntEnum / IntFlag / StrEnum fixes: these now inherit from ReprEnum so the str() output now matches format() output, which is the data types’ (so both str(AnIntEnum.ONE) and format(AnIntEnum.ONE) is equal to '1').\r\n```\r\n\r\nThis is unlikely to be easily findable for users running into this change, since `StrEnum` doesn't exist in Python 3.10, and it's a little obscure.  I would suggest:\r\n\r\n\u003e The default str() of an Enum has changed to include both Enum name and the member name (`Enum.MEMBER`), whereas before it was just the member name.  To continue to use the old behavior, inherit from `IntEnum` or `StrEnum`.\r\n\r\nDoes this make sense? Are there other cases I'm missing? Happy to file a PR, but thought I would get some discussion first.","author":{"url":"https://github.com/mdboom","@type":"Person","name":"mdboom"},"datePublished":"2022-10-13T20:41:22.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/98250/cpython/issues/98250"}