[Python] How to leave matplotlib figure opened after script ends?

Suppose I have the following script plotting a graph for me:

import matplotlib.pyplot as plt
import matplotlib.image as mpimg
import numpy as np

img = mpimg.imread('stinkbug.png')
#circle = plt.Circle((0, 0), radius=0.5, fc='y')
circle = plt.Circle((0, 0), radius=100, fill=False, color='b')

fig, ax = plt.subplots()
ax.imshow(img)
ax.add_artist(circle)
fig.show()
pass


Unfortunately, the figure closes after the script ends.

How to prevent that?

UPDATE

If it is impossible for the figure to survive the script, then what is the reason for it? What is the connection between the figure and the script?

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