import matplotlib.pyplot as plt
import numpy as np
import matplotlib
matplotlib.use("WebAgg")

fig = plt.figure(figsize=(7, 5))
fig.canvas.manager.set_window_title("My figure")
ax = fig.add_subplot(111)

dx, dy = 0.05, 0.05
y, x = np.mgrid[slice(1, 5 + dy, dy),
slice(1, 5 + dx, dx)]
z = np.sin(x)**10 + np.cos(10 + y*x) * np.cos(x)

cf = ax.contourf(x + dx/2., y + dy/2., z)
fig.colorbar(cf, ax=ax)

plt.show()