组合两个堆叠条形图以获得分组堆叠条 plot

Question

So I found the following code online:

import matplotlib.pyplot as plt
import matplotlib

matplotlib.style.use('ggplot')

plotdata = pd.DataFrame({
    "2018_m":[40, 12, 10, 26, 36],
    "2019_m":[19, 8, 30, 21, 38],
    "2020_m":[10, 10, 42, 17, 37]
    }, index=["Dad", "Mam", "Bro", "Sis", "Me"]
)

plotdata2 = pd.DataFrame({
    "2018_y":[20, 22, 10, 34, 12],
    "2019_y":[12, 19, 27, 35, 14],
    "2020_y":[21, 31, 52, 20, 34]
    }, index=["Dad", "Mam", "Bro", "Sis", "Me"]
)

stacked_data = plotdata.apply(lambda x: x*100/sum(x), axis=1)
stacked_data2 = plotdata2.apply(lambda x: x*100/sum(x), axis=1)
stacked_data.plot(kind="bar", stacked=True)
stacked_data2.plot(kind="bar", stacked=True)

And this is the output:

I was wondering what would be the best way to combine them so that Dad, Mam, Bro etc. each have two stacked bars? I've come across a bunch of other grouped stacked bar codes online and elsewhere on Stack Overflow but they require you to iteratively define which values you have for each bar, whereas ideally I'd want to just have to reference the dataframe names 'plotdata' and 'plotdata2' like in the code above.

Thanks in advance!

Answer 1

For two groups, you can pass position and adjust the width accordingly:

fig, ax = plt.subplots()

stacked_data.plot(kind="bar", stacked=True, width=0.4, 
                  ax=ax, position=0)
stacked_data2.plot(kind="bar", stacked=True, width=0.4, 
                   ax=ax, position=1, hatch='//')

ax.set_xlim(right=len(stacked_data)-0.5)

Output: