René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: matplotlib simple example fails in Python 3.14","articleBody":"### Bug summary\n\nUsing the simplest Pyplot example as a minimal test case on Python 3.14 gives a `RecursionError: maximum recursion depth exceeded` in `path.py`.\n\n### Code for reproduction\n\n```Python\nimport matplotlib.pyplot as plt\n\nplt.plot([1, 2, 3, 4])\nplt.ylabel('some numbers')\nplt.show()\n```\n\n### Actual outcome\n\n```python3\n... trails way back ...\n  File \"/home/bje/source/nemo/myenv/lib/python3.14/site-packages/matplotlib/path.py\", line 285, in __deepcopy__\n    p = copy.deepcopy(super(), memo)\n  File \"/usr/lib/python3.14/copy.py\", line 157, in deepcopy\n    y = _reconstruct(x, memo, *rv)\n  File \"/usr/lib/python3.14/copy.py\", line 234, in _reconstruct\n    y = func(*args)\n  File \"/usr/lib/python3.14/copy.py\", line 233, in \u003cgenexpr\u003e\n    args = (deepcopy(arg, memo) for arg in args)\n            ~~~~~~~~^^^^^^^^^^^\n  File \"/usr/lib/python3.14/copy.py\", line 138, in deepcopy\n    y = copier(memo)\n  File \"/home/bje/source/nemo/myenv/lib/python3.14/site-packages/matplotlib/path.py\", line 285, in __deepcopy__\n    p = copy.deepcopy(super(), memo)\nRecursionError: maximum recursion depth exceeded\n```\n\n### Expected outcome\n\nThe simple example should Just Work.\n\n### Additional information\n\n_No response_\n\n### Operating system\n\nUbuntu 24.04\n\n### Matplotlib Version\n\n3.10.3\n\n### Matplotlib Backend\n\nWxAgg\n\n### Python version\n\nPython 3.14.0rc1\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\npip","author":{"url":"https://github.com/bje-","@type":"Person","name":"bje-"},"datePublished":"2025-07-30T01:07:31.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/30370/matplotlib/issues/30370"}