René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: RadioButtons.set_label_props is expecting values of a single list","articleBody":"### Bug summary\n\nThe class method in the title is expecting a dictionary with values of type list, and this is not documented, nor it is intuitive. \n\n### Code for reproduction\n\n```Python\nimport matplotlib.pyplot as plt\n\nfrom matplotlib.widgets import RadioButtons\n\nfig, ax=plt.subplots()\n\ns = RadioButtons(\n    ax=ax,\n    labels=[\"0\", \"3\", \"4\", \"6\"],\n    active=0,\n)\ns.set_label_props({'color': '0.7'})\nplt.show()\n```\n\n### Actual outcome\n\n```\nTraceback (most recent call last):\n  File \"/home/doron/repos/lab-ion-trap-simulations/./t.py\", line 14, in \u003cmodule\u003e\n    s.set_label_props({'color': '0.7'})\n    ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^\n  File \"/nix/store/zzzn0kgrcy13ckd7jwhjg2b3c2svkpbq-python3-3.13.5-env/lib/python3.13/site-packages/matplotlib/widgets.py\", line 1720, in set_label_props\n    text.update(prop)\n    ~~~~~~~~~~~^^^^^^\n  File \"/nix/store/zzzn0kgrcy13ckd7jwhjg2b3c2svkpbq-python3-3.13.5-env/lib/python3.13/site-packages/matplotlib/text.py\", line 205, in update\n    ret.extend(super().update(kwargs))\n               ~~~~~~~~~~~~~~^^^^^^^^\n  File \"/nix/store/zzzn0kgrcy13ckd7jwhjg2b3c2svkpbq-python3-3.13.5-env/lib/python3.13/site-packages/matplotlib/artist.py\", line 1223, in update\n    return self._update_props(\n           ~~~~~~~~~~~~~~~~~~^\n        props, \"{cls.__name__!r} object has no property {prop_name!r}\")\n        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/nix/store/zzzn0kgrcy13ckd7jwhjg2b3c2svkpbq-python3-3.13.5-env/lib/python3.13/site-packages/matplotlib/artist.py\", line 1209, in _update_props\n    ret.append(func(v))\n               ~~~~^^^\n  File \"/nix/store/zzzn0kgrcy13ckd7jwhjg2b3c2svkpbq-python3-3.13.5-env/lib/python3.13/site-packages/matplotlib/text.py\", line 1006, in set_color\n    mpl.colors._check_color_like(color=color)\n    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^\n  File \"/nix/store/zzzn0kgrcy13ckd7jwhjg2b3c2svkpbq-python3-3.13.5-env/lib/python3.13/site-packages/matplotlib/colors.py\", line 249, in _check_color_like\n    raise ValueError(\n    ...\u003c6 lines\u003e...\n        f\"and pairs combining one of the above with an alpha value\")\nValueError: '.' is not a valid value for color: supported inputs are (r, g, b) and (r, g, b, a) 0-1 float tuples; '#rrggbb', '#rrggbbaa', '#rgb', '#rgba' strings; named color strings; string reprs of 0-1 floats for grayscale values; 'C0', 'C1', ... strings for colors of the color cycle; and pairs combining one of the above with an alpha value\n```\n\n### Expected outcome\n\nNo error, and this output:\n\n\u003cimg width=\"646\" height=\"552\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/3446ac4e-eeed-410d-af88-32710cb9f9d5\" /\u003e\n\n### Additional information\n\nThis seems to fix the issue:\n\n```\ns.set_label_props({'color': ['0.7']})\n```\n\nBut it is very unexpected, and not intuitive IMO.\n\n### Operating system\n\nNixOS\n\n### Matplotlib Version\n\n3.10.3\n\n### Matplotlib Backend\n\nqtagg\n\n### Python version\n\n3.13.5\n\n### Jupyter version\n\nIrrelevant\n\n### Installation\n\nNone","author":{"url":"https://github.com/doronbehar","@type":"Person","name":"doronbehar"},"datePublished":"2025-08-05T11:42:54.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/30393/matplotlib/issues/30393"}