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"""
=================
contourf(X, Y, Z)
=================
Plot filled contours.
See `~matplotlib.axes.Axes.contourf`.
"""
import matplotlib.pyplot as plt
import numpy as np
plt.style.use('_mpl-gallery-nogrid')
# make data
X, Y = np.meshgrid(np.linspace(-3, 3, 256), np.linspace(-3, 3, 256))
Z = (1 - X/2 + X**5 + Y**3) * np.exp(-X**2 - Y**2)
levels = np.linspace(Z.min(), Z.max(), 7)
# plot
fig, ax = plt.subplots()
ax.contourf(X, Y, Z, levels=levels)
plt.show()
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