Create donut chart using matplotlib
# library
import matplotlib.pyplot as plt
# create data
size_of_groups=[12,11,3,30]
# Create a pieplot
plt.pie(size_of_groups)
# add a circle at the center to transform it in a donut chart
my_circle=plt.Circle( (0,0), 0.7, color='white')
p=plt.gcf()
p.gca().add_artist(my_circle)
plt.show()