You can generate a basic treemap using the plot() function of squarify library in python. The function requires the following parameters:
sizes: a list (or a column of data frame) of valueslabel: a list (or a column of data frame) of label text
In a treemap, each square will be as big as its value.
# libraries
import pandas as pd
import matplotlib.pyplot as plt
import squarify # pip install squarify (algorithm for treemap)
# If you have 2 lists
squarify.plot(sizes=[13,22,35,5], label=["group A", "group B", "group C", "group D"], alpha=.7 )
plt.axis('off')
plt.show()
# If you have a data frame
df = pd.DataFrame({'nb_people':[8,3,4,2], 'group':["group A", "group B", "group C", "group D"] })
squarify.plot(sizes=df['nb_people'], label=df['group'], alpha=.8 )
plt.axis('off')
plt.show() 
