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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Consider testing `zoneinfo` with `tzdata` PyPI package installed","articleBody":"# Feature or enhancement\r\n\r\nRight now none of our build bots test `zoneinfo` with `tzdata` pypi package installed.\r\nProof: https://github.com/python/cpython/pull/99602/files#diff-7908b1930bd1135d6f8077ef5ff578b02577f5f7042b54be88b9b86b6c7af45dR27-R35\r\n\r\nLink to the package: https://pypi.org/project/tzdata/\r\n\r\nHowever, it works locally:\r\n\r\n```\r\n(.venv) ~/Desktop/cpython  issue-99508 ✔                                             \r\n» pip install tzdata     \r\nCollecting tzdata\r\n  Using cached tzdata-2022.6-py2.py3-none-any.whl (338 kB)\r\nInstalling collected packages: tzdata\r\nSuccessfully installed tzdata-2022.6\r\n\r\n(.venv) ~/Desktop/cpython  issue-99508 ✔                                             \r\n» python\r\nPython 3.12.0a2+ (heads/main:a3360facba, Nov 19 2022, 14:10:54) [Clang 11.0.0 (clang-1100.0.33.16)] on darwin\r\nType \"help\", \"copyright\", \"credits\" or \"license\" for more information.\r\n\u003e\u003e\u003e import importlib.metadata\r\n\u003e\u003e\u003e importlib.metadata.metadata(\"tzdata\")\r\n\u003cimportlib.metadata._adapters.Message object at 0x107d5df50\u003e\r\n```\r\n\r\nBut, presence / absence of this 3rd party package change the behavior of `zoneinfo` module: both `C` and `Python` versions of it.\r\n\r\nSo, we need to be sure that tests can check all combinations.\r\n\r\n# Risks\r\n\r\nRight now we don't have 3rd party packages installed for tests.\r\nThis might cause quite a lot of problems: where / how / when to install it.\r\nIt also can affect test / buildbot stability, because `pip` sometimes just fails to install some packages and you have to retry.\r\n\r\n# Pitch\r\n\r\nI think we should test with `tzdata` PyPI package installed on at least one buildbot / CI job.\r\nThe question is: how can we do it without compromising the CI setup and reliability?\r\n\r\n# Previous discussion\r\n\r\n- https://github.com/python/cpython/issues/84683#issuecomment-1093870842 \r\n- https://github.com/python/cpython/pull/99602\r\n- https://github.com/python/cpython/issues/96463\r\n\r\nCC @pganssle \r\n","author":{"url":"https://github.com/sobolevn","@type":"Person","name":"sobolevn"},"datePublished":"2022-11-21T14:05:07.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/99649/cpython/issues/99649"}