René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"2.6.x Plot the Discharge against time gives Warning","articleBody":"```# setup line graph\r\nplt.plot(df['datetime'],df['Discharge(cfs)'])\r\nplt.title('Houston Flood discharge at Hunting Bayou stream gauge')\r\nplt.ylabel('Discharge(cfs)')\r\nplt.xlabel('datetime')\r\nax = plt.gca()\r\ndf.set_index('datetime')\r\n\r\n# Only label every 20th value\r\nticks_to_use = df.index[::100]\r\n# label ticks per day\r\ndr = pd.date_range('2017-08-23', periods=9, freq='D')\r\n\r\n## Now set the ticks and labels\r\nax.set_xticks(ticks_to_use)\r\nax.set_xticklabels(dr)\r\nplt.xticks(rotation='vertical')\r\n\r\nplt.show()\r\n``` \r\n\r\nyields:\r\n\r\n\r\n```/Users/scott/.pyenv/versions/3.6.5/lib/python3.6/site-packages/matplotlib/font_manager.py:1241: UserWarning: findfont: Font family ['serif'] not found. Falling back to DejaVu Sans.\r\n  (prop.get_family(), self.defaultFamily[fontext]))```","author":{"url":"https://github.com/scottdangelo","@type":"Person","name":"scottdangelo"},"datePublished":"2019-10-08T15:50:27.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/86/visualize-data-with-python/issues/86"}