René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Using \"drawstyle\" raises AttributeError in errorbar, when yerr is specified.","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\nHello maintainers! \r\nStarting from 3.4.1, I'm having failures in CI related to a failure in `errorbar` (e.g. https://github.com/StingraySoftware/HENDRICS/runs/2267849177?check_suite_focus=true). Until at least 3.3.4, this code line\r\n\r\n```\r\nplt.errorbar(x, profile, yerr=profile_err, drawstyle=\"steps-mid\")\r\n```\r\n\r\nused to work, now it doesn't. After a little debugging, I realized that `yerr` and `drawstyle` seem incompatible. I write a MWE below\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\nIn [1]: import numpy as np\r\n\r\nIn [2]: import matplotlib.pyplot as plt\r\n\r\nIn [3]: x = np.arange(10)\r\n\r\nIn [4]: y = np.random.poisson(100, 10)\r\n\r\nIn [5]: plt.errorbar(x, y, drawstyle=\"steps-mid\")\r\nOut[5]: \u003cErrorbarContainer object of 3 artists\u003e\r\n\r\nIn [6]: plt.show()  # It works\r\n\r\nIn [7]: yerr = np.zeros_like(y) + 10\r\n\r\nIn [8]: plt.errorbar(x, y, yerr=yerr, drawstyle=\"steps-mid\")\r\n---------------------------------------------------------------------------\r\nAttributeError                            Traceback (most recent call last)\r\n\u003cipython-input-8-a70dfad4683c\u003e in \u003cmodule\u003e\r\n----\u003e 1 plt.errorbar(x, y, yerr=yerr, drawstyle=\"steps-mid\")\r\n\r\n~/anaconda3/envs/py38/lib/python3.8/site-packages/matplotlib/pyplot.py in errorbar(x, y, yerr, xerr, fmt, ecolor, elinewidth, capsize, barsabove, lolims, uplims, xlolims, xuplims, errorevery, capthick, data, **kwargs)\r\n   2739         uplims=False, xlolims=False, xuplims=False, errorevery=1,\r\n   2740         capthick=None, *, data=None, **kwargs):\r\n-\u003e 2741     return gca().errorbar(\r\n   2742         x, y, yerr=yerr, xerr=xerr, fmt=fmt, ecolor=ecolor,\r\n   2743         elinewidth=elinewidth, capsize=capsize, barsabove=barsabove,\r\n\r\n~/anaconda3/envs/py38/lib/python3.8/site-packages/matplotlib/__init__.py in inner(ax, data, *args, **kwargs)\r\n   1350     def inner(ax, *args, data=None, **kwargs):\r\n   1351         if data is None:\r\n-\u003e 1352             return func(ax, *map(sanitize_sequence, args), **kwargs)\r\n   1353 \r\n   1354         bound = new_sig.bind(ax, *args, **kwargs)\r\n\r\n~/anaconda3/envs/py38/lib/python3.8/site-packages/matplotlib/axes/_axes.py in errorbar(self, x, y, yerr, xerr, fmt, ecolor, elinewidth, capsize, barsabove, lolims, uplims, xlolims, xuplims, errorevery, capthick, **kwargs)\r\n   3496         if yerr is not None:\r\n   3497             lower, upper = extract_err('y', yerr, y, lolims, uplims)\r\n-\u003e 3498             barcols.append(self.vlines(\r\n   3499                 *apply_mask([x, lower, upper], everymask), **eb_lines_style))\r\n   3500             # select points without upper/lower limits in y and\r\n\r\n~/anaconda3/envs/py38/lib/python3.8/site-packages/matplotlib/__init__.py in inner(ax, data, *args, **kwargs)\r\n   1350     def inner(ax, *args, data=None, **kwargs):\r\n   1351         if data is None:\r\n-\u003e 1352             return func(ax, *map(sanitize_sequence, args), **kwargs)\r\n   1353 \r\n   1354         bound = new_sig.bind(ax, *args, **kwargs)\r\n\r\n~/anaconda3/envs/py38/lib/python3.8/site-packages/matplotlib/axes/_axes.py in vlines(self, x, ymin, ymax, colors, linestyles, label, **kwargs)\r\n   1118                                      linestyles=linestyles, label=label)\r\n   1119         self.add_collection(lines, autolim=False)\r\n-\u003e 1120         lines.update(kwargs)\r\n   1121 \r\n   1122         if len(x) \u003e 0:\r\n\r\n~/anaconda3/envs/py38/lib/python3.8/site-packages/matplotlib/artist.py in update(self, props)\r\n   1060                     func = getattr(self, f\"set_{k}\", None)\r\n   1061                     if not callable(func):\r\n-\u003e 1062                         raise AttributeError(f\"{type(self).__name__!r} object \"\r\n   1063                                              f\"has no property {k!r}\")\r\n   1064                     ret.append(func(v))\r\n\r\nAttributeError: 'LineCollection' object has no property 'drawstyle'\r\n\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: Mac OS, Linux, Windows (all tested on CI)\r\n  * Matplotlib version (`import matplotlib; print(matplotlib.__version__)`): 3.4.1\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): various\r\n  * Python version: 3.8\r\n  * Jupyter version (if applicable): \r\n  * Other libraries: \r\n\r\n\u003c!--Please tell us how you installed matplotlib and python e.g., from source, pip, conda--\u003e \r\nI installed matplotlib from pip (on CI) and conda (my laptop)\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/matteobachetti","@type":"Person","name":"matteobachetti"},"datePublished":"2021-04-06T08:29:32.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/19879/matplotlib/issues/19879"}