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os.fsync(fd)

#!/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, "This is test")

# Use fsync() method.
os.fsync(fd)

# Read the content
os.lseek(fd, 0, 0)
str = os.read(fd, 100)
print("Read string is : ", str)

# Close the file
os.close(fd)

print("Successfully closed the file!!")

Read string is :  This is test
Successfully closed the file!!