René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: markerfacecoloralt not supported when drawing errorbars","articleBody":"### Bug summary\n\nAlthough the documentation says that all Line2D `kwargs` should be supported, only a small handful actually are:\r\n\r\nhttps://github.com/matplotlib/matplotlib/blob/4f5cacfde9024076d9ab0cb6ad1c9a7cf352d5f9/lib/matplotlib/axes/_axes.py#L3393\r\n\r\n`markerfacecoloralt` is not among that list.\n\n### Code for reproduction\n\n```python\nimport numpy as np\r\nimport matplotlib.pyplot as plt\r\n\r\n# example data\r\nx = np.arange(0.1, 4, 0.5)\r\ny = np.exp(-x)\r\n\r\n# example error bar values that vary with x-position\r\nerror = 0.1 + 0.2 * x\r\n\r\nfig, ax = plt.subplots(1, 1)\r\nax.errorbar(x, y, yerr=error, fmt='-o', markerfacecoloralt='white')\r\nax.set_title('variable, symmetric error')\n```\n\n\n### Actual outcome\n\n`AttributeError: 'LineCollection' object has no property 'markerfacecoloralt'`\n\n### Expected outcome\n\nNo error\n\n### Additional information\n\n`markerfacecoloralt` needs to be added to this list: https://github.com/matplotlib/matplotlib/blob/4f5cacfde9024076d9ab0cb6ad1c9a7cf352d5f9/lib/matplotlib/axes/_axes.py#L3393\r\n\r\nBetter yet, automagically check against the signature of `Line2D`.\n\n### Operating system\n\nUbuntu 20.04.4\n\n### Matplotlib Version\n\n3.5.2\n\n### Matplotlib Backend\n\nQtAgg\n\n### Python version\n\n3.8.10\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\npip","author":{"url":"https://github.com/wqian94","@type":"Person","name":"wqian94"},"datePublished":"2022-06-30T20:55:17.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/23375/matplotlib/issues/23375"}