René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: violin's default alpha no longer persists","articleBody":"### Bug summary\n\nPerhaps this is an understood and accepted behaviour change, but I did not see anything in the changenotes.  If we set the facecolor of a violin object after creating it, we now also override the default alpha.\n\n### Code for reproduction\n\n```Python\nimport matplotlib.pyplot as plt\nimport numpy as np\n\nfig, ax = plt.subplots()\n\ndata = np.random.normal(size=(10, 3))\nviolins = ax.violinplot(data)\n\nfirst_violin = violins['bodies'][0]\nfirst_violin.set_facecolor('tab:red')\n\nplt.show()\n```\n\n### Actual outcome\n\nWith `main` I get\n\n\u003cimg width=\"640\" height=\"480\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/35342949-cd5a-4736-95a4-554a19580446\" /\u003e\n\n### Expected outcome\n\nWith 3.10 I get\n\n\u003cimg width=\"640\" height=\"480\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/afc0ce36-be1b-41f0-a194-13947fa88f25\" /\u003e\n\n### Additional information\n\nBisects to #27304.  The default alpha is now included in the default facecolor as a `(color, alpha)` tuple, rather than being passed by the _alpha_ parameter.\n\n### Operating system\n\nUbuntu\n\n### Matplotlib Version\n\n`main`\n\n### Matplotlib Backend\n\nqtagg\n\n### Python version\n\n3.13.7\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\ngit checkout","author":{"url":"https://github.com/rcomer","@type":"Person","name":"rcomer"},"datePublished":"2025-09-28T10:42:26.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/30613/matplotlib/issues/30613"}