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os.write(fd, str)

#!/usr/bin/python3

import os, sys

# Open a file
fd = os.open("f1.txt", os.O_RDWR | os.O_CREAT)

# Write a string
str = "This is tutorialpro.org site"
ret = os.write(fd, bytes(str, 'UTF-8'))

# Print the return value
print("Number of bytes written: ")
print(ret)

print("Write successful")

# Close the file
os.close(fd)
print("File closed successfully!!")

Number of bytes written: 
23
Write successful
File closed successfully!!