# libraries
import matplotlib.pyplot as plt
import squarify    # pip install squarify (algorithm for treemap)
import pandas as pd

# Create a data frame with fake data
df = pd.DataFrame({'nb_people':[8,3,4,2], 'group':["group A", "group B", "group C", "group D"] })

# plot it
squarify.plot(sizes=df['nb_people'], label=df['group'], alpha=.8 )
plt.axis('off')
# plt.show()
path = '../img/'
filename = 'filename.png'
saved = path + filename
plt.savefig(saved, dpi = 300)