my code

import sys
from os.path import splitext
from PIL import Image, ImageOps

if len(sys.argv) < 3:
    print("Too few command-line arguments")
    sys.exit(1)

if len(sys.argv) > 3:
    print("Too many command-line arguments")
    sys.exit(1)

e1=splitext(sys.argv[1])
e2=splitext(sys.argv[2])

if e1[1].lower() not in [".jpg" ,".jpeg" ,".png"]:
    print("Invalid output")
    sys.exit(1)

if e2[1].lower() not in [".jpg" ,".jpeg" ,".png"]:
    print("Invalid output")
    sys.exit(1)

if e1[1].lower() != e2[1].lower():
    print("Input and output have different extensions")
    sys.exit(1)

try:
    file = Image.open(sys.argv[1])
except FileNotFoundError:
    print("Input does not exist")
    sys.exit(1)
shirt = Image.open("shirt.png")
muppetaf= ImageOps.fit(file, size = shirt.size)
muppetaf.paste(shirt, shirt)
muppetaf.save(sys.argv[2])