René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"axes.bar fails when x is int-indexed pandas.Series","articleBody":"### Bug report\r\n\r\n#### Bug summary\r\nThe following codes fail in matplotlib 3.1.1, while work properly in 3.0.3\r\n\r\n#### case 1\r\n**Code for reproduction**\r\n```python\r\nimport pandas as pd\r\nfrom matplotlib import pyplot as plt\r\n\r\ndf = pd.DataFrame({\"x\":[1,2,3],\"width\":[.2,.4,.6]},index=[1,2,3])\r\n\r\nplt.figure()\r\nplt.bar(df.x, 1, width=df.width)\r\nplt.show()\r\n```\r\n\r\n**Actual outcome**\r\n```\r\nTraceback (most recent call last):\r\n  File \"/Desktop/fail_example.py\", line 7, in \u003cmodule\u003e\r\n    plt.bar(df.x, 1, width=df.width)\r\n  File \"/.pyenv/versions/3.7.3/lib/python3.7/site-packages/matplotlib/pyplot.py\", line 2440, in bar\r\n    **({\"data\": data} if data is not None else {}), **kwargs)\r\n  File \"/.pyenv/versions/3.7.3/lib/python3.7/site-packages/matplotlib/__init__.py\", line 1601, in inner\r\n    return func(ax, *map(sanitize_sequence, args), **kwargs)\r\n  File \"/.pyenv/versions/3.7.3/lib/python3.7/site-packages/matplotlib/axes/_axes.py\", line 2430, in bar\r\n    label='_nolegend_',\r\n  File \"/.pyenv/versions/3.7.3/lib/python3.7/site-packages/matplotlib/patches.py\", line 707, in __init__\r\n    Patch.__init__(self, **kwargs)\r\n  File \"/.pyenv/versions/3.7.3/lib/python3.7/site-packages/matplotlib/patches.py\", line 89, in __init__\r\n    self.set_linewidth(linewidth)\r\n  File \"/.pyenv/versions/3.7.3/lib/python3.7/site-packages/matplotlib/patches.py\", line 368, in set_linewidth\r\n    self._linewidth = float(w)\r\n```\r\n\r\n**Expected outcome**\r\nOutcome in 3.0.3:\r\n![Figure_1](https://user-images.githubusercontent.com/38477252/64062230-0ddab400-cc1f-11e9-8f3b-2387eb4c04e8.png)\r\n\r\n\r\n#### case 2\r\n**Code for reproduction**\r\n```python\r\nimport pandas as pd\r\nfrom matplotlib import pyplot as plt\r\n\r\ndf = pd.DataFrame({\"x\":[1,3,10]},index=[1000,2000,3000])\r\n\r\nplt.figure()\r\nplt.bar(df.x, 1, width=.2)\r\nplt.show()\r\n```\r\n\r\n**Actual outcome**\r\n![Figure_2](https://user-images.githubusercontent.com/38477252/64063566-b0e7f980-cc30-11e9-9dfa-a5b8c301ec6f.png)\r\n\r\n**Expected outcome**\r\nOutcome in 3.0.3:\r\n![Figure_3](https://user-images.githubusercontent.com/38477252/64063567-b2b1bd00-cc30-11e9-9418-bef1ab0b3bd2.png)\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: MacOSX\r\n  * Matplotlib version: 3.1.1 (installed from pip)\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): MacOSX\r\n  * Python version: 3.7.3\r\n  * Jupyter version (if applicable):\r\n  * Other libraries: pandas 0.24.2\r\n\r\n**Cause of the bug**\r\n```\r\n_axes.py, line 2363 in bar:\r\n            x0 = x\r\n            x = np.asarray(self.convert_xunits(x))\r\n            width = self._convert_dx(width, x0, x, self.convert_xunits)\r\n_axes.py, line 2166 in _convert_dx: \r\n            try:\r\n                x0 = x0[0]\r\n            except (TypeError, IndexError, KeyError):\r\n                x0 = x0\r\n```\r\nI guess x0 is expected to be a scalar after this line, However when x0 is an int-indexed (and 0 is not in its indices) pandas.Series, it is continued to be pandas.Series and causes chained disorders to end in the error above.\r\nTo evidence, they worked properly when rewritten as (ugly!):\r\n```\r\n            try:\r\n                x0 = x0[0]\r\n            except (TypeError, IndexError, KeyError):\r\n                try:\r\n                    x0 = x0.iat[0]\r\n                except:\r\n                    x0 = x0\r\n```","author":{"url":"https://github.com/infrub","@type":"Person","name":"infrub"},"datePublished":"2019-08-31T10:18:03.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/15162/matplotlib/issues/15162"}