I usually do this for line graphs with markers:

    line, = self.subplot.plot_date(dates,data)

along with some keywords to tweak the plot.  I then add line to a
dictionary to keep track of it:

    self.line_to_data_dict[line] = self.activity

But today I tried this with a bar chart, just changing plot_date to
bar and renaming the "line," to "bars,":

    fake_data = [2,2,5]
    bars, = self.subplot.bar(fake_data, fake_data )

This gave me the error:  ValueError:  too many values to unpack.

OK, so if I removed the comma from "bars," so it is just "bars", it
goes through but then I cannot add it to my dictionary--I get:

> TypeError: list objects are unhashable

Help in understanding this and a better approach would be helpful.  Thanks,
Che

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