I'm using matplotlib.pyplot.plot to plot values from CSV files where
the x axis data are datetime objects.  This works well except for two
issues:

    * The time ranges are large (one-second samples over a period of
      several days) and I find the x axis label formats are often
      inappropriate to the scale.  How to I control the format of
      the x axis labels?

    * Samples are only collected for part of the time each day, say
      from 01:00 to 15:00.  How can I elide the gaps and perhaps
      plot a vertical line to signify the elided gaps?

Thanks,

Skip Montanaro



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