import matplotlib.pyplot as plt

# If you want to draw multiple lines in one plotting attempt
x1 = [1, 2, 3]
y1 = [1, 2, 3]
x2 = [1, 2, 3]
y2 = [1, 4, 9]
plt.plot(x1, y1, x2, y2,linewidth=3)
plt.show()
