René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[MNT]: validate linewidth","articleBody":"### Summary\n\nI accidentally set linewidth as ``'2'`` instead of 2 and the resulting error message is of no help:\n\n```python-traceback\n [/usr/local/lib/python3.11/dist-packages/matplotlib/backends/backend_agg.py](https://localhost:8080/#) in draw_path(self, gc, path, transform, rgbFace)\n    128         else:\n    129             try:\n--\u003e 130                 self._renderer.draw_path(gc, path, transform, rgbFace)\n    131             except OverflowError:\n    132                 cant_chunk = ''\n\nRuntimeError: Unable to cast Python instance of type \u003cclass 'tuple'\u003e to C++ type '?' (#define PYBIND11_DETAILED_ERROR_MESSAGES or compile in debug mode for details)\n```\n\n### Proposed fix\n\nOther parameters like color get validated real time, so if it's not too expensive I think validating that linewidth is a number could save some debugging frustration. ","author":{"url":"https://github.com/story645","@type":"Person","name":"story645"},"datePublished":"2025-07-17T01:35:37.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":13},"url":"https://github.com/30323/matplotlib/issues/30323"}