Scatter plots in Pandas/Pyplot: How to plot by category

Question

I am trying to make a simple scatter plot in pyplot using a Pandas DataFrame object, but want an efficient way of plotting two variables but have the symbols dictated by a t

Answer 1

It's rather hacky, but you could use one1 as a Float64Index to do everything in one go:

df.set_index('one').sort_index().groupby('key1')['two'].plot(style='--o', legend=True)

Note that as of 0.20.3, sorting the index is necessary, and the legend is a bit wonky.