import numpy as np
import matplotlib.pyplot as plt
x = np.linspace(-1.0, 1.0, 100)
y = np.linspace(-1.0, 1.0, 100)
X, Y = np.meshgrid(x, y)
F = X ** 2 + Y ** 2 - 0.6
plt.contour(X, Y, F, [0])
plt.show()
Plot equation showing a circle