Esfera

 import numpy as np
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
fig= plt.figure()
ax=Axes3D(fig)
theta=np.arange(0,2*np.pi,0.01)
phi=np.arange(0,np.pi,0.01)
theta,phi=np.meshgrid(theta,phi)
r=np.sqrt(9)
x=r*np.sin(phi)*np.cos(theta)
y=r*np.sin(phi)*np.sin(theta)
z=r*np.cos(phi)
ax.plot_surface(x,y,z,color='y')
plt.show()