[Python] Problem with modifying image pixel by pixel in Pillow Python

I'm running python3 and my code is:

from PIL import Image

im = Image.open("image.png")
pixels = im.load()
for x in range(im.width):
for y in range(im.height):
pixels[x, y] = (50,50,50)

im.show()


The code seems to be correct according to the docs but it throws this error:

File "file.py", line 7, in <module>
pixels[x, y] = (50,50,50)
TypeError: color must be int or single-element tuple


How can a color be a single integer?

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