[Python] Why Image Pasting not working in Python using Image Module

from PIL import Image, ImageOps

import sys

list = ['jpg', 'jpeg', 'png']

before = sys.argv[1]
after = sys.argv[2]

if len(sys.argv) == 3:
if before[-3:] in list and after[-3:] in list and after[-3:] == before[-3:]:
try:
i_file = Image.open(before)
shirt = Image.open('shirt.png')
#o_file = Image.open(after)

except FileNotFoundError:
print(f"Input does not exist")
sys.exit(1)

size = (600, 600)
#Resizing the before image here
ImageOps.fit(i_file, size).save(before)


i_file = Image.open(before)
#Trying to paste the shirt over i_file(before2.jpg image)
Image.Image.paste(i_file, shirt, (0, 0))

i_file.save(after)


else:
print('Input and output have different extensions')
sys.exit(1)




$ python shirt.py before2.jpg after2.jpg


shirt image with background removed before2.jpg

In the above code I want to paste my shirt.png (a constant image) over the before.jpg (taken from the commandline) and then save it to after.jpg (also taken from the commandline)

The problem I am facing is this, my after.jpg is coming out like this after.jpg

I have tried things but I think the problem is with my execution of paste method somehow.

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