import numpy as np
import matplotlib.pyplot as plt

# produces a polygon with multiple holes:
nx, ny = 10, 10
numlev = 2
lons, lats = np.meshgrid(np.linspace(-50, 50, nx),
                         np.linspace(-45, 45, ny))
data = np.sin(np.sqrt(lons ** 2 + lats ** 2))

plt.subplot(221)
plt.contourf(lons, lats, data, numlev)

plt.subplot(222)
plt.contourf(lons, lats, data, numlev, )

numlev = 2
x, y = np.meshgrid(np.arange(-5.5, 5.5, 0.25), np.arange(-5.5, 5.5, 0.25))
dim = x.shape[0]
data = np.sin(np.sqrt(x ** 2 + y ** 2))
lats = np.arange(dim) + 30
lons = np.arange(dim) - 20

plt.subplot(223)
plt.contourf(lons, lats, data, numlev)

plt.subplot(224)
plt.contourf(lons, lats, data, numlev)

plt.show()