Show counts on a stacked bar plot

from plotnine import (
    ggplot,
    aes,
    after_stat,
    geom_bar,
    geom_text
)
from plotnine.data import mtcars

A stacked bar plot.

(ggplot(mtcars, aes('factor(cyl)', fill='factor(am)'))
 + geom_bar( position='fill')
)

<Figure Size: (640 x 480)>

We want to know how many items are in each of the bars, so we add a geom_text with the same stat as geom_bar and map the label aesthetic to the computed count.

(ggplot(mtcars, aes('factor(cyl)', fill='factor(am)'))
 + geom_bar(position='fill')
 + geom_text(aes(label=after_stat('count')), stat='count')
)

<Figure Size: (640 x 480)>

Not what we wanted.

We forgot to give geom_text the same position as geom_bar. Let us fix that.

(ggplot(mtcars, aes('factor(cyl)', fill='factor(am)'))
 + geom_bar( position='fill')
 + geom_text(aes(label=after_stat('count')), stat='count', position='fill')
)

<Figure Size: (640 x 480)>

That is more like it