René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Plotting legend throws error \"font family ['serif'] not found. Falling back to DejaVu Sans\"","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\n\u003c!--A short 1-2 sentences that succinctly describes the bug--\u003e\r\nMatplotlib shows a warning when adding a legend to a graph while using the TeX backend.\r\nError is: _findfont: Font family ['serif'] not found. Falling back to DejaVu Sans._\r\nA typical looking graph is supplied but I'm unsure as to the correctness of the legend font.\r\n\r\n**Code for reproduction**\r\n\r\n\u003c!--A minimum code snippet required to reproduce the bug.\r\nPlease make sure to minimize the number of dependencies required, and provide\r\nany necessary plotted data.\r\nAvoid using threads, as Matplotlib is (explicitly) not thread-safe.--\u003e\r\n\r\n```python\r\nfrom matplotlib import rc\r\nimport matplotlib.pyplot as plt\r\n\r\nrc('font', **{'family':'serif','serif':'Computer Modern'})\r\nrc('text', usetex=True)\r\n\r\nplt.figure()\r\nplt.plot(0,0,label='Input')\r\nplt.title('Commenting out legend removes warning')\r\n\r\nplt.legend()\r\n\r\nplt.show()\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\nfindfont: Font family ['serif'] not found. Falling back to DejaVu Sans.\r\n```\r\nThe graph is output normally.\r\n\r\n**Expected outcome**\r\n\r\n\u003c!--A description of the expected outcome from the code snippet--\u003e\r\n\u003c!--If this used to work in an earlier version of Matplotlib, please note the version it used to work on--\u003e\r\n\r\nNo errors, and a key that works.\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: Ubuntu Focal Fossa GNOME Terminal 3.36.1.1\r\n  * Matplotlib version: 3.2.1\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): GTK3Agg\r\n  * Python version: 3.8.2 (GCC 9.3.0 on linux)\r\n  * Jupyter version (if applicable): NA\r\n  * Other libraries: \r\n\r\n\u003c!--Please tell us how you installed matplotlib and python e.g., from source, pip, conda--\u003e\r\n\u003c!--If you installed from conda, please specify which channel you used if not the default--\u003e\r\n\r\nmatplotlib was installed via pip (20.1.1), and python was installed via apt.","author":{"url":"https://github.com/Struan-Murray","@type":"Person","name":"Struan-Murray"},"datePublished":"2020-05-27T13:43:10.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/17518/matplotlib/issues/17518"}