René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Should ArtistList implement `__add__`?","articleBody":"\u003c!--\r\nWelcome! Thanks for thinking of a way to improve Matplotlib.\r\n\r\n\r\nBefore creating a new feature request please search the issues for relevant feature requests.\r\n--\u003e\r\n\r\n### Problem\r\n\r\nArtistList (#18216) is great :) but I realized that I had a few places in my old programs where I was doing e.g. `ax.lines + ax.images + ...`, which now breaks because there's no `ArtistList.__add__`.  Instead one can do `[*ax.lines, *ax.images, ...]` but perhaps implementing `ArtistList.__add__` may help with the transition?\r\n\r\n### Proposed Solution\r\n\r\nImplement `ArtistList.__add__` (which should only add ArtistLists and/or lists, and return plain lists).  `ArtistList.__iadd__` should probably also be implemented as throwing an exception (or emitting a deprecation warning), as direct modification of ArtistLists is currently being deprecated.\r\n\r\n### Additional context and prior art\r\n\r\nN/A","author":{"url":"https://github.com/anntzer","@type":"Person","name":"anntzer"},"datePublished":"2021-04-07T09:57:43.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/19890/matplotlib/issues/19890"}