[Python] How to draw a rectangle on image

How to draw a rectangle on an image, like this:

import matplotlib.pyplot as plt
from PIL import Image
import numpy as np
im = np.array(Image.open('dog.png'), dtype=np.uint8)
plt.imshow(im)


To make it clear, I meant to draw a rectangle on top of the image for visualization, not to change the image data.

So using matplotlib.patches.Patch would be the best option.

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