René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"KeyError: 'gridOn' in axis.py when axis.tick_params() is used with reset = True","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\nUsing matplotlib 3.4.1 on a fresh miniconda installation, trying to add a grid to an axis can return an error.\r\nIt seems to be linked with the \"reset\" option of the tick_param function of an axis, if the function has been used just before adding the grid. Activating the option seems to cause the issue; removing the option makes everything work.\r\n\r\n**Code for reproduction**\r\n\r\n```python\r\nfig, axes = plt.subplots(1, 4, sharey= True)\r\n\r\n# This doesn't work\r\nfor axis in axes:\r\n    axis.tick_params(reset = True, axis='both', which='major', labelsize= 10, right = False, top = False)\r\nfor axis in axes:\r\n    axis.grid(color = \"gainsboro\", linestyle='-', linewidth=0.5) \r\n    axis.set_facecolor('#FCFCFC')\r\n\r\n# This works\r\nfor axis in axes:\r\n    axis.tick_params(reset = False, axis='both', which='major', labelsize= 10, right = False, top = False)\r\nfor axis in axes:\r\n    axis.grid(color = \"gainsboro\", linestyle='-', linewidth=0.5) \r\n    axis.set_facecolor('#FCFCFC')\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```python\r\n  File \"C:\\ProgramData\\Miniconda3\\lib\\site-packages\\matplotlib\\axis.py\", line 1414, in grid\r\n    gridkw['gridOn'] = not self._major_tick_kw['gridOn']\r\n\r\nKeyError: 'gridOn'\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\nThe grid is expected to be added to the figure without any issue, resulting in the following appearance : \r\n\r\n![image](https://user-images.githubusercontent.com/41070328/116950882-67954c00-ac54-11eb-8ba0-212a42310737.png)\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: Windows 10\r\n  * Matplotlib version (`import matplotlib; print(matplotlib.__version__)`): 3.4.1\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): Qt5Agg\r\n  * Python version: 3.9.1\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 the anaconda command prompt, using `conda install -c conda-forge matplotlib`.\r\n\r\n","author":{"url":"https://github.com/Klemet","@type":"Person","name":"Klemet"},"datePublished":"2021-05-04T01:14:01.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/20149/matplotlib/issues/20149"}