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import numpy as npimport matplotlib.pyplot as plt
step = 0.01x = np.arange(-10, 10, step)y = np.arange(-10, 10, step)
X, Y = np.meshgrid(x, y)
Z = -(X**2 + Y**2)
contourf = plt.contourf(X, Y, Z, levels=6, cmap='hot')
contour = plt.contour(X, Y, Z, levels=8, colors='k')plt.clabel(contour, fontsize=10, colors='k')
plt.xticks([])plt.yticks([])
plt.colorbar(contourf)
plt.show()
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