René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"3D scatterplots do not generate legend correctly","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\nCreating a 3d scatterplot with ax.scatter() and the \"c\" argument for colour only produces 1 legend entry\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\nimport numpy as np\r\nimport matplotlib.pyplot as plt\r\n\r\nfig = plt.figure()\r\nax = fig.add_subplot(111, projection='3d')\r\nx = np.random.rand(20)\r\ny = np.random.rand(20)\r\nz = np.random.rand(20)\r\nc = np.random.randint(low=0, high=4, size=20)\r\nax.scatter(x,y,z,c=c)\r\nleg = [1,2,3, 4]\r\nax.legend(leg)\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![Output Image](https://i.snipboard.io/qMYz1f.jpg)\r\n\r\n**Expected outcome**\r\n\r\nThe legend should have separate entries for \"1\", \"2\", \"3\", \"4\"\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\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 18.04\r\n  * Matplotlib version: 3.3.0 (also exists at least as far back as 3.2.2)\r\n  * Matplotlib backend (`TkAgg`):\r\n  * Python version: 3.6.3\r\n  * Jupyter version (if applicable): N/A\r\n  * Other libraries: Numpy \r\n\r\n\u003c!--Please tell us how you installed matplotlib and python e.g., from source, pip, conda--\u003e pip\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/OGordon100","@type":"Person","name":"OGordon100"},"datePublished":"2020-07-28T12:02:30.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/18096/matplotlib/issues/18096"}