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os.dup(fd);

#!/usr/bin/python3

import os, sys

# Open a file
fd = os.open("foo.txt", os.O_RDWR|os.O_CREAT)

# Duplicate the file descriptor
d_fd = os.dup(fd)

# Write to the file using the duplicated file descriptor
os.write(d_fd, "This is test".encode())

# Close the files
os.closerange(fd, d_fd)

print("Successfully closed all files!!")

Successfully closed all files!!