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os.open(file, flags[, mode]);

#!/usr/bin/python3

import os, sys

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

# Write a string
os.write(fd, str.encode("This is test"))

# Close the file
os.close(fd)

print("Closed the file successfully!!")

Closed the file successfully!!