René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: regression with setting ticklabels for colorbars in matplotlib 3.5.0b1","articleBody":"### Bug summary\r\n\r\nmatplotlib 3.5.0b1 breaks the following code, which runs fine on 3.4.3\r\nThe crash happens while running the last line:\r\n```\r\ncbar.ax.set_xticklabels(cbar.ax.get_xticklabels())\r\n```\r\nAdmittedly this line seems like it should not do anything and certainly not produce an error.\r\nIn practice, my actual application contains the following:\r\n```python\r\ncbar.ax.set_xticklabels(cbar.ax.get_xticklabels(), rotation=45)\r\n```\r\nwhich looks more like a hack than a supported usage of matplotlib's api, so I'd be happy to change it but I was not yet able to find a cleaner way to perform that rotation.\r\nStill, no matter how untidy my application is, I'm fairly convinced that breaking it is a bug.\r\n\r\n### Code for reproduction\r\n\r\n```python\r\nimport matplotlib.pyplot as plt\r\nimport numpy as np\r\n\r\nx, y = np.mgrid[1:100, 1:100]\r\nz = np.random.random_sample(x.shape)\r\n\r\nfig, ax = plt.subplots()\r\n\r\nim = ax.contourf(x, y, z, levels=50)\r\ncbar = fig.colorbar(im, orientation='horizontal')\r\ncbar.ax.set_xticklabels(cbar.ax.get_xticklabels())\r\n```\r\n\r\n\r\n### Actual outcome\r\n\r\n\u003cdetails\u003e\r\n\u003csummary\u003eTraceback\u003c/summary\u003e\r\n\r\n```\r\n╭─────────────────────────────── Traceback (most recent call last) ────────────────────────────────╮\r\n│ /private/tmp/dustyn/t_mpl.py:11 in \u003cmodule\u003e                                                      │\r\n│                                                                                                  │\r\n│    8                                                                                             │\r\n│    9 im = ax.contourf(x, y, z, levels=50)                                                        │\r\n│   10 cbar = fig.colorbar(im, orientation='horizontal')                                           │\r\n│ ❱ 11 cbar.ax.set_xticklabels(cbar.ax.get_xticklabels())                                          │\r\n│   12                                                                                             │\r\n│                                                                                                  │\r\n│ /Users/robcleme/.pyenv/versions/3.9.6/envs/mpl35_tmp/lib/python3.9/site-packages/matplotlib/axes │\r\n│ /_base.py:75 in wrapper                                                                          │\r\n│                                                                                                  │\r\n│     72 │   │   get_method = attrgetter(f\"{self.attr_name}.{self.method_name}\")                   │\r\n│     73 │   │                                                                                     │\r\n│     74 │   │   def wrapper(self, *args, **kwargs):                                               │\r\n│ ❱   75 │   │   │   return get_method(self)(*args, **kwargs)                                      │\r\n│     76 │   │                                                                                     │\r\n│     77 │   │   wrapper.__module__ = owner.__module__                                             │\r\n│     78 │   │   wrapper.__name__ = name                                                           │\r\n│                                                                                                  │\r\n│ /Users/robcleme/.pyenv/versions/3.9.6/envs/mpl35_tmp/lib/python3.9/site-packages/matplotlib/axis │\r\n│ .py:1798 in _set_ticklabels                                                                      │\r\n│                                                                                                  │\r\n│   1795 │   │   \"\"\"                                                                               │\r\n│   1796 │   │   if fontdict is not None:                                                          │\r\n│   1797 │   │   │   kwargs.update(fontdict)                                                       │\r\n│ ❱ 1798 │   │   return self.set_ticklabels(labels, minor=minor, **kwargs)                         │\r\n│   1799 │                                                                                         │\r\n│   1800 │   def _set_tick_locations(self, ticks, *, minor=False):                                 │\r\n│   1801 │   │   # see docstring of set_ticks                                                      │\r\n│                                                                                                  │\r\n│ /Users/robcleme/.pyenv/versions/3.9.6/envs/mpl35_tmp/lib/python3.9/site-packages/matplotlib/axis │\r\n│ .py:1720 in set_ticklabels                                                                       │\r\n│                                                                                                  │\r\n│   1717 │   │   │   # Passing [] as a list of ticklabels is often used as a way to                │\r\n│   1718 │   │   │   # remove all tick labels, so only error for \u003e 0 ticklabels                    │\r\n│   1719 │   │   │   if len(locator.locs) != len(ticklabels) and len(ticklabels) != 0:             │\r\n│ ❱ 1720 │   │   │   │   raise ValueError(                                                         │\r\n│   1721 │   │   │   │   │   \"The number of FixedLocator locations\"                                │\r\n│   1722 │   │   │   │   │   f\" ({len(locator.locs)}), usually from a call to\"                     │\r\n│   1723 │   │   │   │   │   \" set_ticks, does not match\"                                          │\r\n╰──────────────────────────────────────────────────────────────────────────────────────────────────╯\r\nValueError: The number of FixedLocator locations (51), usually from a call to set_ticks, does not match the number of ticklabels (9).\r\n```\r\n\r\n\u003c/details\u003e\r\n\r\n### Expected outcome\r\n\r\na boring image :)\r\n\r\n### Operating system\r\n\r\nOS/X\r\n\r\n### Matplotlib Version\r\n\r\n.5.0b1\r\n\r\n### Matplotlib Backend\r\n\r\nMacOSX\r\n\r\n### Python version\r\n\r\n3.9.6\r\n\r\n### Jupyter version\r\n\r\nN/A\r\n\r\n### Other libraries\r\n\r\n_No response_\r\n\r\n### Installation\r\n\r\npip\r\n\r\n### Conda channel\r\n\r\n_No response_","author":{"url":"https://github.com/neutrinoceros","@type":"Person","name":"neutrinoceros"},"datePublished":"2021-09-03T19:00:09.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":12},"url":"https://github.com/20989/matplotlib/issues/20989"}