René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"matplotlib 3.1.2: mplot3d must be explicitly imported to work","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\nIn \"API Changes - Behavior changes\" (https://matplotlib.org/api/api_changes.html#behavior-changes) it says\r\n\r\n\"mplot3d auto-registration\r\n\r\nmpl_toolkits.mplot3d is always registered by default now. It is no longer necessary to import mplot3d to create 3d axes with\r\n\r\nax = fig.add_subplot(111, projection=\"3d\")\"\r\n\r\nI am not seeing this behaviour.\r\n\r\n\u003c!--A short 1-2 sentences that succinctly describes the bug--\u003e\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 matplotlib.pyplot as plt\r\nfig3 = plt.figure()\r\nax3 = fig3.add_subplot(111, projection='3d')\r\n```\r\nand\r\n\r\n```python\r\nmpl.projections.get_projection_names()\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---------------------------------------------------------------------------\r\nKeyError                                  Traceback (most recent call last)\r\n~/Berechnung/lib64/python3.6/site-packages/matplotlib/projections/__init__.py in get_projection_class(projection)\r\n     57     try:\r\n---\u003e 58         return projection_registry.get_projection_class(projection)\r\n     59     except KeyError:\r\n\r\n~/Berechnung/lib64/python3.6/site-packages/matplotlib/projections/__init__.py in get_projection_class(self, name)\r\n     24         \"\"\"\r\n---\u003e 25         return self._all_projection_types[name]\r\n     26 \r\n\r\nKeyError: '3d'\r\n\r\nDuring handling of the above exception, another exception occurred:\r\n\r\nValueError                                Traceback (most recent call last)\r\n\u003cipython-input-2-95b16d9d7a18\u003e in \u003cmodule\u003e\r\n      1 import matplotlib.pyplot as plt\r\n      2 fig3 = plt.figure()\r\n----\u003e 3 ax3 = fig3.add_subplot(111, projection='3d')\r\n\r\n~/Berechnung/lib64/python3.6/site-packages/matplotlib/figure.py in add_subplot(self, *args, **kwargs)\r\n   1394         else:\r\n   1395             projection_class, kwargs, key = \\\r\n-\u003e 1396                 self._process_projection_requirements(*args, **kwargs)\r\n   1397 \r\n   1398             # try to find the axes with this key in the stack\r\n\r\n~/Berechnung/lib64/python3.6/site-packages/matplotlib/figure.py in _process_projection_requirements(self, polar, projection, *args, **kwargs)\r\n   1118 \r\n   1119         if isinstance(projection, str) or projection is None:\r\n-\u003e 1120             projection_class = projections.get_projection_class(projection)\r\n   1121         elif hasattr(projection, '_as_mpl_axes'):\r\n   1122             projection_class, extra_kwargs = projection._as_mpl_axes()\r\n\r\n~/Berechnung/lib64/python3.6/site-packages/matplotlib/projections/__init__.py in get_projection_class(projection)\r\n     58         return projection_registry.get_projection_class(projection)\r\n     59     except KeyError:\r\n---\u003e 60         raise ValueError(\"Unknown projection %r\" % projection)\r\n     61 \r\n     62 \r\n\r\nValueError: Unknown projection '3d'\r\n\r\n\u003cFigure size 432x288 with 0 Axes\u003e\r\n```\r\n\r\nand\r\n\r\n```\r\n['aitoff', 'hammer', 'lambert', 'mollweide', 'polar', 'rectilinear']\r\n```\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\nAn Axes3d object and the following output of `mpl.projections.get_projection_names()`:\r\n\r\n```\r\n['3d', 'aitoff', 'hammer', 'lambert', 'mollweide', 'polar', 'rectilinear']\r\n```\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: Linux thinkpad_T500 4.19.72-gentoo #3 SMP Sun Dec 8 14:16:38 CET 2019 x86_64 Intel(R) Core(TM)2 Duo CPU T9400 @ 2.53GHz GenuineIntel GNU/Linux\r\n  * Matplotlib version: 3.1.2\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): module://ipykernel.pylab.backend_inline\r\n  * Python version: 3.6.9\r\n  * Jupyter version (if applicable): jupyter core     : 4.6.1, jupyter-notebook : 6.0.2\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 is running in a python environment and was installed with pip.","author":{"url":"https://github.com/pajot","@type":"Person","name":"pajot"},"datePublished":"2020-01-12T12:26:34.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/16192/matplotlib/issues/16192"}