René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[MNT]: Not possible to set `AutoDateFormatter` rcParam to function without deprecation warning","articleBody":"### Summary\r\n\r\nNot clear if it should be possible, but it is possible to use functions instead of format strings so one may think it should be possible to set the `rcParam` to a function as well. The documentation is a bit vague and do not really encourage changing them, so maybe it is not supposed to be possible.\r\n\r\nhttps://github.com/matplotlib/matplotlib/blob/65e962008a1f43fca4b1096c6f88685892d1ab2d/lib/matplotlib/dates.py#L867-L869\r\n```\r\nIn [1]: mpl.rcParams['date.autoformatter.year'] = lambda a: str(a)\r\nC:\\Users\\Oscar\\AppData\\Local\\Temp\\ipykernel_9940\\331672118.py:1: MatplotlibDeprecationWarning: Support for setting an rcParam that expects a str value to a non-str value is deprecated since 3.5 and support will be removed two minor releases later.\r\n  mpl.rcParams['date.autoformatter.year'] = lambda a: str(a)\r\n```\r\n\r\n### Proposed fix\r\n\r\nAdd a \"string or callable\" verifier and use that.","author":{"url":"https://github.com/oscargus","@type":"Person","name":"oscargus"},"datePublished":"2022-05-08T10:16:11.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/23012/matplotlib/issues/23012"}