René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Inconsistent argument handling for plot_date()","articleBody":"\r\n**Pyplot doesn't use a lineplot by default**\r\n\r\nPyplot is using a scatterplot by default when no arguments are applied. \r\n\r\n\r\n```python\r\nimport pandas as pd\r\nimport matplotlib.pyplot as plt\r\n\r\nd = {'dates': [\"2019-05-16\", \"2019-05-19\", \"2019-05-23\"], 'value': [8281, 8193, 7998]}\r\n\r\ndf = pd.DataFrame(data=d)\r\n\r\nx_value = df['dates']\r\ny_value = df['value']\r\n\r\nplt.plot_date(x_value, y_value)\r\nplt.gcf().autofmt_xdate()\r\nplt.show()\r\n```\r\n\r\nThe code above produces the following output:\r\n![grafik](https://user-images.githubusercontent.com/52132296/83413327-ec139500-a41b-11ea-8516-39576beda109.png)\r\n\r\n**Scatterplot changes to lineplot when color changes**\r\nWhen changing one of the arguments, e.g. the color, the scatterplot changes to lineplot automatically.\r\nWhen using ``` plt.plot_date(x_value, y_value, 'r') ``` instead, the output produces a lineplot, although the line style '-' was not used as an argument:\r\n![grafik](https://user-images.githubusercontent.com/52132296/83413256-d7cf9800-a41b-11ea-8468-936c9f997d54.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: Windows 10\r\n  * Matplotlib version: 3.0.2\r\n  * Python version:3.7.2\r\n\r\nMatplotlib installed from pip.\r\n\r\n","author":{"url":"https://github.com/grap3-fru1t","@type":"Person","name":"grap3-fru1t"},"datePublished":"2020-06-01T13:31:03.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/17548/matplotlib/issues/17548"}