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os.fchown(fd, uid, gid)

#!/usr/bin/python3

import os, sys, stat

# Open the file "/tmp/foo.txt"
fd = os.open("/tmp", os.O_RDONLY)

# Set the user ID of the file to 100
os.fchown(fd, 100, -1)

# Set the group ID of the file to 50
os.fchown(fd, -1, 50)

print("Permissions modified successfully!!")

# Close the file
os.close(fd)

Permissions modified successfully!!