René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Setting xticklabels causes warning related to FixedFormatter","articleBody":"\u003c!--To help us understand and resolve your issue, please fill out the form to the best of your ability.--\u003e\r\n\u003c!--You can feel free to delete the sections that do not apply.--\u003e\r\n\r\n### Bug report\r\n\r\n**Bug summary**\r\n\r\nI get a warning related to `FixedFormatter` even though I am not setting a formatter.\r\n\r\nThanks to user Rational-IM [on StackOverflow](https://stackoverflow.com/questions/63723514/userwarning-fixedformatter-should-only-be-used-together-with-fixedlocator) and the good folks at [pandas ](https://github.com/pandas-dev/pandas/issues/35684) for isolating and reproducing the bug.\r\n\r\n**Code for reproduction**\r\n\r\n```python\r\nimport matplotlib.pyplot as plt\r\n\r\nfig, ax = plt.subplots()\r\nax.scatter(0.5, 0.5)\r\nax.set_xticklabels(['0', r'$T/2$', r'$T$'])\r\n\r\n# Optional line\r\nax.xaxis.set_major_locator(FixedLocator([0, 0.5, 1]))\r\n\r\nNone\r\n```\r\n\r\n**Actual outcome**\r\n\r\n\u003c!--The output produced by the above code, which may be a screenshot, console output, etc.--\u003e\r\n\r\n```\r\n\u003cipython-input-3-52a3699e4278\u003e:5: UserWarning: FixedFormatter should only be used together with FixedLocator\r\n  ax.set_xticklabels(['0', r'$T/2$', r'$T$'])\r\n```\r\n\r\n**Expected outcome**\r\n\r\nWorks on 3.2.2 with no warning.\r\n\r\n**Matplotlib version**\r\n\u003c!--Please specify your platform and versions of the relevant libraries you are using:--\u003e\r\n  * Operating system: Win 10\r\n  * Matplotlib version: 3.3.2\r\n  * Matplotlib backend: module://ipykernel.pylab.backend_inline\r\n  * Python version: 3.8.5\r\n  * Jupyter version (if applicable): 6.1.4\r\n  * Other libraries: none\r\n\r\n\u003c!--Please tell us how you installed matplotlib and python e.g., from source, pip, conda--\u003e\r\nInstalled from conda\r\n\u003c!--If you installed from conda, please specify which channel you used if not the default--\u003e\r\n\r\n","author":{"url":"https://github.com/igurin-invn","@type":"Person","name":"igurin-invn"},"datePublished":"2020-10-30T19:43:42.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":24},"url":"https://github.com/18848/matplotlib/issues/18848"}