importmatplotlib.pyplotaspltimportnumpyasnpax=plt.figure().add_subplot(projection='3d')# Prepare arrays x, y, ztheta=np.linspace(-4*np.pi,4*np.pi,100)z=np.linspace(-2,2,100)r=z**2+1x=r*np.sin(theta)y=r*np.cos(theta)ax.plot(x,y,z,label='parametric curve')ax.legend()plt.show()

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