You can easily save a figure in Matplotlib with the following code. If you want to learn Python then I will highly recommend you to read This Book.
Save Figure in Matplotlib
The function plt.savefig is used to save a figure in Matplotlib.
from matplotlib import pyplot as plt
x = [1,2,3,4,5]
y = [10,20,30,40,50]
plt.title("Numbers and Products")