René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"More consistent handling of 'None' vs. 'none'","articleBody":"**Summary**\r\n\r\nThe strings `'None'` vs `'none'` are not handled consistently:\r\n\r\n- At least MarkerStyle only accepts `'None'` (xref https://github.com/matplotlib/matplotlib/pull/19291#discussion_r557735785). - Maybe other places too.\r\n- However, in many places we accept both `'None'`, `'none'` (and sometimes also other capitalizations).\r\n- Counting occurences, we have 777 'none' and 139 `'None'` in our code base.\r\n\r\n### Proposed fix\r\n\r\nAim at making the API more consistent by:\r\n\r\n- Choose one version and use it whenever possible throughout code, docs and examples.\r\n  - I propose to choose `'none'` because most other named strings are lowercase. And it's a step further away from `None`, which may help making it more clear that those two are different.\r\n- Make all other places accept that version too.\r\n- For now do **not** deprecate other writings or conversions. If a way of writing is working now, there'll be lots of code out there using it. It's not worth breaking that.\r\n\r\nNote @brunobeltran You might stumble over these inconsistencies when formalizing types.","author":{"url":"https://github.com/timhoffm","@type":"Person","name":"timhoffm"},"datePublished":"2021-01-14T22:28:20.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/19300/matplotlib/issues/19300"}