René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]:  removing module does not reliably work anymore in 3.10.5 (regression)","articleBody":"### Bug summary\n\nAs of matplotlib 3.10.5, deleting the module on the fly and then reimporting it does not work anymore. This used to work in 3.10.3.\n\n### Code for reproduction\n\n```Python\n#!/usr/bin/env python\n\nimport sys\nimport matplotlib.pyplot as plt\n\npackage_names = [\"matplotlib\"]\nfor package in package_names:\n    loaded_package_modules = [key for key, value in sys.modules.items() if package in str(value)]\n    for key in loaded_package_modules:\n        del sys.modules[key]\n\nimport matplotlib.pyplot as plt\n```\n\n### Actual outcome\n\n```python\nTraceback (most recent call last):\n  File \"/home/neutronst4r/3Dplot_test/./mp_import_test2.py\", line 12, in \u003cmodule\u003e\n    import matplotlib.pyplot as plt\n  File \"/home/neutronst4r/[redacted]/env/lib/python3.13/site-packages/matplotlib/__init__.py\", line 161, in \u003cmodule\u003e\n    from . import _api, _version, cbook, _docstring, rcsetup\n  File \"/home/neutronst4r/[redacted]/env/lib/python3.13/site-packages/matplotlib/rcsetup.py\", line 28, in \u003cmodule\u003e\n    from matplotlib.colors import Colormap, is_color_like\n  File \"/home/neutronst4r/[redacted]/env/lib/python3.13/site-packages/matplotlib/colors.py\", line 57, in \u003cmodule\u003e\n    from matplotlib import _api, _cm, cbook, scale, _image\nImportError: generic_type: type \"_InterpolationType\" is already registered!\n```\n\n### Expected outcome\n\nimport should work without error\n\n### Additional information\n\nerror is fixed by switching to matplotlib 3.10.3\n\n### Operating system\n\nArch Linux using virtual environment\n\n### Matplotlib Version\n\n3.10.5\n\n### Matplotlib Backend\n\n_No response_\n\n### Python version\n\n3.13.5\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\npip","author":{"url":"https://github.com/neutronst4r","@type":"Person","name":"neutronst4r"},"datePublished":"2025-08-05T10:17:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/30392/matplotlib/issues/30392"}