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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Importing module with capsule attribute fails in sub interpreter","articleBody":"# Bug report\n\n### Bug description:\n\nWhen importing certain modules (`zoneinfo` is an example), attributes are missing when inside a sub interpreter.\n\nImporting these modules works inside the main interpreter. \n\nI've written a test to demonstrate the bug\n\n```python\nimport unittest\nimport _xxsubinterpreters as interpreters\n\n\nclass TestCapsule(unittest.TestCase):\n\n    def test_capsule(self):\n        import zoneinfo\n\n    def test_capsule_in_sub_interpreter(self):\n        interp = interpreters.create()\n        interpreters.run_string(interp, \"import zoneinfo\")\n```\n\n```default\n.Traceback (most recent call last):\n  File \"\u003cstring\u003e\", line 1, in \u003cmodule\u003e\n  File \"/usr/local/lib/python3.13/zoneinfo/__init__.py\", line 14, in \u003cmodule\u003e\n    from _zoneinfo import ZoneInfo\nAttributeError: module 'datetime' has no attribute 'datetime_CAPI'\nE\n======================================================================\nERROR: test_capsule_in_sub_interpreter (test_capsule.TestCapsule.test_capsule_in_sub_interpreter)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/Users/anthonyshaw/projects/subinterpreter-web/test_capsule.py\", line 12, in test_capsule_in_sub_interpreter\n    interpreters.run_string(interp, \"import zoneinfo\")\n_xxsubinterpreters.RunFailedError: AttributeError: module 'datetime' has no attribute 'datetime_CAPI'\n\n----------------------------------------------------------------------\nRan 2 tests in 0.457s\n\nFAILED (errors=1)\n```\n\nI haven't seen this behaviour on any other modules, the thing that seemed special with `datetime` and this attribute is that it is a PyCapsule. So the issue is likely related to that?\n\n### CPython versions tested on:\n\n3.13, CPython main branch\n\n### Operating systems tested on:\n\nmacOS\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-112101\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/tonybaloney","@type":"Person","name":"tonybaloney"},"datePublished":"2023-11-15T03:25:42.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/112100/cpython/issues/112100"}