Added argument in show() to speficy figure number to use

[fkgruber]

I added a feature allow to select the figure number to use to plot. This way you can work simultaneously with 2 different plot displayed in 2 different figure windows.

Example usage

import plotnine as pn
import pandas as pd

ggp1=(
     pn.ggplot(pd.DataFrame(
         {"x":[1,2,3,4,5],
          "y":[4,3,4,3,3]}),
               pn.aes("x","y")
               )
     +pn.geom_point()
    )
ggp1.show(1)



ggp2=(
    pn.ggplot(pd.DataFrame({"x":[1,2,3,4,5],
                            "y":[4,3,4,3,3]}),
              pn.aes("x","y"))
    +pn.geom_point(color="red")
)
ggp2.show(2)


(ggp1+pn.geom_line(color='blue')).show(1) 

[fkgruber]

I push one more change to clear the figure when you provide a figure number.

[has2k1]

Thanks for this feature. I am not yet sure about the internal API changes. The external
API p.show(num=1) is fine okay, but we should find a way not to add the parameter to 4 other internal functions i.e.

ggplot.draw(bool=False, num=None)
facet.setup(num=None)
facet.make_figure(num=None)
facet._make_figure(num=None)

I will find a way to get this in before the next release.

[has2k1]

Out of precaution because the API may change, I will look to add reusing figures as part of v0.15.0 instead of v0.14.0 which is the next one. v0.15.0 will do more things around figures.

Other options to consider for this functionality are:

ggplot(figure_num=1)

from plotnine.options import set_option
set_option(figure_num=1)
...