How to plot a nested pie chart in Matplotlib?

To plot a nested pie chart in Matplotlib, we can take the following steps −

  • Set the figure size and adjust the padding between and around the subplots.
  • Create a figure and a set of subplots.
  • Initialize a variable size, create vals, cmap, outer_colors, inner_colors data using numpy.
  • Use pie() function to make pie charts.
  • To display the figure, use show() method.


import matplotlib.pyplot as plt
import numpy as np

plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True

fig, ax = plt.subplots()
size = 0.3
vals = np.array([[60., 32.], [37., 40.], [29., 10.]])
cmap = plt.get_cmap("tab20c")
outer_colors = cmap(np.arange(3)*4)
inner_colors = cmap([1, 2, 5, 6, 9, 10])

ax.pie(vals.sum(axis=1), radius=1, colors=outer_colors,
   wedgeprops=dict(width=size, edgecolor='w'))
ax.pie(vals.flatten(), radius=1-size, colors=inner_colors,
   wedgeprops=dict(width=size, edgecolor='w')


Updated on: 10-Jun-2021

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