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[Bug]: Python 3.14 recursion error #29785

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richard-hajek opened this issue Mar 20, 2025 · 3 comments
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[Bug]: Python 3.14 recursion error #29785

richard-hajek opened this issue Mar 20, 2025 · 3 comments
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status: duplicate

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@richard-hajek
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richard-hajek commented Mar 20, 2025 •
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Bug summary

Recursion limit reached on seemingly innocent scatter

Code for reproduction

def main():
    import matplotlib.pyplot as plt

    plt.scatter([1,2], [3, 4])
    plt.show()


if __name__ == "__main__":
    main()

Actual outcome

I get an exception

...
File "/home/meowxiik/.local/share/uv/python/cpython-3.14.0a6-linux-x86_64-gnu/lib/python3.14/copy.py", line 233, in <genexpr>
    args = (deepcopy(arg, memo) for arg in args)
            ~~~~~~~~^^^^^^^^^^^
  File "/home/meowxiik/.local/share/uv/python/cpython-3.14.0a6-linux-x86_64-gnu/lib/python3.14/copy.py", line 138, in deepcopy
    y = copier(memo)
  File "/home/meowxiik/test3/.venv/lib/python3.14/site-packages/matplotlib/path.py", line 285, in __deepcopy__
    p = copy.deepcopy(super(), memo)
  File "/home/meowxiik/.local/share/uv/python/cpython-3.14.0a6-linux-x86_64-gnu/lib/python3.14/copy.py", line 157, in deepcopy
    y = _reconstruct(x, memo, *rv)
  File "/home/meowxiik/.local/share/uv/python/cpython-3.14.0a6-linux-x86_64-gnu/lib/python3.14/copy.py", line 234, in _reconstruct
    y = func(*args)
  File "/home/meowxiik/.local/share/uv/python/cpython-3.14.0a6-linux-x86_64-gnu/lib/python3.14/copy.py", line 233, in <genexpr>
    args = (deepcopy(arg, memo) for arg in args)
            ~~~~~~~~^^^^^^^^^^^
  File "/home/meowxiik/.local/share/uv/python/cpython-3.14.0a6-linux-x86_64-gnu/lib/python3.14/copy.py", line 138, in deepcopy
    y = copier(memo)
  File "/home/meowxiik/test3/.venv/lib/python3.14/site-packages/matplotlib/path.py", line 285, in __deepcopy__
    p = copy.deepcopy(super(), memo)
  File "/opt/pycharm-professional/plugins/python-ce/helpers/pydev/_pydevd_bundle/pydevd_pep_669_tracing.py", line 640, in py_raise_callback
    if frame is _get_top_level_frame():
                ~~~~~~~~~~~~~~~~~~~~^^
  File "/opt/pycharm-professional/plugins/python-ce/helpers/pydev/_pydevd_bundle/pydevd_pep_669_tracing.py", line 176, in _get_top_level_frame
    name = splitext(basename(filename))[0]
                    ~~~~~~~~^^^^^^^^^^
  File "<frozen posixpath>", line 169, in basename
RecursionError: maximum recursion depth exceeded

Expected outcome

I do not get an exception

Additional information

Does not seem to occur when no renderer is found. Does seem to occur when ran in PyCharm and Marimo. Does not occur when uv run python3 main.py, which does this though

/home/meowxiik/test3/main.py:5: UserWarning: FigureCanvasAgg is non-interactive, and thus cannot be shown
  plt.show()

Operating system

Linux

Matplotlib Version

3.10.1

Matplotlib Backend

module://backend_interagg

Python version

Python 3.14.0a6

Jupyter version

No response

Installation

None
@richard-hajek
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richard-hajek commented Mar 20, 2025 •
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Related: marimo-team/marimo#4178 ( Contains exact versions and environment config )

@rcomer
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rcomer commented Mar 20, 2025

Duplicate of #29157 I think

@QuLogic
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QuLogic commented Mar 20, 2025

Yes.

@QuLogic QuLogic closed this as completed Mar 20, 2025
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@QuLogic @rcomer @richard-hajek