René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"_reshape_2D function behavior changed, breaks hist for some cases in 3.3.0","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\nIn version 3.2.2, plt.hist(df['class']) will produce a correct histogram where df['class'] is a series of strings. In version 3.3.0, _reshape_2D gives different output in this case, leading to slow computation and a graph with too many bars.\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 seaborn as sns\r\nimport matplotlib.pyplot as plt\r\ndf = sns.load_dataset('titanic')\r\nplt.hist(df['class'])\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\nThis is under matplotlib 3.3.0:\r\n![image](https://user-images.githubusercontent.com/11932155/90066285-c2dc7400-dcaa-11ea-8a7d-03ddade13fbf.png)\r\n\r\nThis is _reshape_2D under 3.3.0:\r\n![image](https://user-images.githubusercontent.com/11932155/90066985-b4db2300-dcab-11ea-86bb-c4d843f57555.png)\r\n\r\n\r\n**Expected outcome**\r\n\r\nThis is under matplotlib 3.2.2:\r\n![image](https://user-images.githubusercontent.com/11932155/90066468-03d48880-dcab-11ea-9f7d-42e76bec4621.png)\r\n\r\nThis is _reshape_2D under 3.2.2:\r\n![image](https://user-images.githubusercontent.com/11932155/90067025-c45a6c00-dcab-11ea-9c88-16c23ef107ec.png)\r\n\r\nCan produce the same output for 3.3.0 by putting the series in a list but ideally I think the behavior should remain the same since this unexpectedly  also breaks other function behavior relying on this (pandas.DataFrame.hist(), plt.hist())\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: macOS Mojave 10.14.6\r\n  * Matplotlib version: 3.3.0\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): module://ipykernel.pylab.backend_inline\r\n  * Python version: 3.7.4\r\n  * Jupyter version (if applicable):\r\n  * Other libraries: numpy: 1.18.1, pandas: 1.1.0, seaborn: 0.9.0\r\n\r\n\u003c!--Please tell us how you installed matplotlib and python e.g., from source, pip, conda--\u003e\r\nmatplot lib installed via 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/RyanBaten","@type":"Person","name":"RyanBaten"},"datePublished":"2020-08-12T20:57:00.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/18234/matplotlib/issues/18234"}