René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]:  'PillowWriter' object has no attribute '_frame' shouldn't be  '_frames'?","articleBody":"### Bug summary\n\nIt seems to be that `gif` animations cannot be generated anymore because of empty list for `ax_fig.lines[0].get_xdata()`.\n\nCurrently, I got the following error in the CI run.\n\n```terminal\nUNEXPECTED EXCEPTION: IndexError('list index out of range')\nTraceback (most recent call last):\n  File \"/home/runner/work/useful-math-functions/useful-math-functions/.venv/lib/python3.10/site-packages/matplotlib/animation.py\", line 224, in saving\n    yield self\n  File \"/home/runner/work/useful-math-functions/useful-math-functions/.venv/lib/python3.10/site-packages/matplotlib/animation.py\", line 1126, in save\n    writer.grab_frame(**savefig_kwargs)\n  File \"/home/runner/work/useful-math-functions/useful-math-functions/.venv/lib/python3.10/site-packages/matplotlib/animation.py\", line 499, in grab_frame\n    self._frame.append(im)\nAttributeError: 'PillowWriter' object has no attribute '_frame'. Did you mean: '_frames'?\nDuring handling of the above exception, another exception occurred:\nTraceback (most recent call last):\n  File \"/home/runner/.local/share/uv/python/cpython-3.10.16-linux-x86_64-gnu/lib/python3.10/doctest.py\", line 1350, in __run\n    exec(compile(example.source, filename, \"single\",\n  File \"\u003cdoctest umf.images.diagrams.ClassicPlot[30]\u003e\", line 1, in \u003cmodule\u003e\n  File \"/home/runner/work/useful-math-functions/useful-math-functions/umf/images/diagrams.py\", line 335, in plot_save_gif\n    anim.save(filename=fname, writer=\"imagemagick\", dpi=settings.dpi, **kwargs)\n  File \"/home/runner/work/useful-math-functions/useful-math-functions/.venv/lib/python3.10/site-packages/matplotlib/animation.py\", line 1098, in save\n    with (writer.saving(self._fig, filename, dpi),\n  File \"/home/runner/.local/share/uv/python/cpython-3.10.16-linux-x86_64-gnu/lib/python3.10/contextlib.py\", line 153, in __exit__\n    self.gen.throw(typ, value, traceback)\n  File \"/home/runner/work/useful-math-functions/useful-math-functions/.venv/lib/python3.10/site-packages/matplotlib/animation.py\", line 226, in saving\n    self.finish()\n  File \"/home/runner/work/useful-math-functions/useful-math-functions/.venv/lib/python3.10/site-packages/matplotlib/animation.py\", line 506, in finish\n    self._frames[0].save(\nIndexError: list index out of range\n/home/runner/work/useful-math-functions/useful-math-functions/umf/images/diagrams.py:73: UnexpectedException\n```\n\nSee also:\n\nhttps://github.com/matplotlib/matplotlib/blob/f39bf4d2585746fce3ba39decba62693c82f194e/lib/matplotlib/animation.py#L499C21-L499C35\n\n### Code for reproduction\n\n```Python\nhttps://github.com/Anselmoo/useful-math-functions/pull/84\n```\n\n### Actual outcome\n\n```shell\nAttributeError: 'PillowWriter' object has no attribute '_frame'. Did you mean: '_frames'?\n```\n\n### Expected outcome\n\nWorking like previously https://github.com/Anselmoo/useful-math-functions/pull/71\n\nSo, I have tested both backend `poetry` and `uv`, but it seems both are not working.\n\n### Additional information\n\nIf `_frame` is changed to `_frames` in local `.venv`, it is working fine.\n\n```toml\ndependencies = [\n    \"numpy\u003e=2.0.0,\u003c3\",\n    \"pydantic\u003e=2.0.0,\u003c3\",\n    \"scipy\u003e=1.11.2,\u003c2\",\n]\n\n[project.optional-dependencies]\nmatplotlib = [\n    \"matplotlib (\u003e=3.10.0,\u003c4.0.0)\",\n    \"imagemagic (\u003e=0.2.1,\u003c0.3.0)\",\n]\n```\n\n### Operating system\n\n_No response_\n\n### Matplotlib Version\n\n\u003e3.10.0\n\n### Matplotlib Backend\n\n_No response_\n\n### Python version\n\n_No response_\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\npip","author":{"url":"https://github.com/Anselmoo","@type":"Person","name":"Anselmoo"},"datePublished":"2025-01-25T17:09:00.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/29519/matplotlib/issues/29519"}