This will solve your problem

```
from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt
import numpy as np
list_center = [(1,2,3),(-4,-5,6), (5,5,6)]
list_radius = [1,2,1]
def plt_sphere(list_center, list_radius):
for c, r in zip(list_center, list_radius):
ax = fig.gca(projection='3d')
# draw sphere
u, v = np.mgrid[0:2*np.pi:50j, 0:np.pi:50j]
x = r*np.cos(u)*np.sin(v)
y = r*np.sin(u)*np.sin(v)
z = r*np.cos(v)
ax.plot_surface(x-c[0], y-c[1], z-c[2], color=np.random.choice(['g','b']), alpha=0.5*np.random.random()+0.5)
fig = plt.figure()
plt_sphere(list_center, list_radius)
```

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