I was looking for a way to set the bottom of the yrange to 0 permanently, 
but let the top auto-scale to the data as the data is updated.

In matplotlib, "bottom" and "top" can be set independently:
e.g. matplotlib.axes.Axes.set_ylim(bottom=0)

In pyqtgraph I found setYRange(min, max), but you have to specify both. Is 
there perhaps a simple workaround to only specify the bottom of the yrange, 
but allow the max to autoscale?

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