Python | os.sync() method

OS module in Python provides functions for interacting with the operating system. OS comes under Python’s standard utility modules. This module provides a portable way of using operating system dependent functionality.
os.sync() method in Python is used to force write of everything to disk. This method allows a process to flush all dirty buffers to disk.
Difference between os.sync(), os.fsync(fd) and os.fdatasync(fd) method – 
os.sync() method force write of everything to disk where as os.fsync(fd) method force write of file associated with the specified file descriptor fd and os.fdatasync(fd) method is similar to os.fsync() method but it does not force update of file’s metadata.
Note: This method is only available on Unix platforms. 

Syntax: os.sync()
Parameter: No parameter is required.
Return type: This method does not return any value. 

Code: Use of os.sync() method 

Python3

# Python program to explain os.sync() method

# importing os module
import os


# File path 1
path1 = 'file.txt'

# File path 2
path2 = 'file2.txt'

# File path 3
path3 = 'file3.txt'

# Open the files and get
# the file descriptors
# associated with them
# using os.open() method
fd1 = os.open(path1, os.O_RDWR)
fd2 = os.open(path2, os.O_RDWR)
fd3 = os.open(path3, os.O_RDWR)


# Write a bytestring
str = b"GeeksforGeeks"
os.write(fd1, str)
os.write(fd2, str)
os.write(fd3, str)


# Sync. all buffers to disk
# i.e force write everything
# to disk using os.sync() method
os.sync()
print("Force write everything committed successfully")

# Close the file descriptors
os.close(fd1)
os.close(fd2)
os.close(fd3)


# os.sync() method
# will flush all buffers
# to disk.
# it may take a significant
# length of time

Output:

Force write of everything committed successfully

Reference: https://docs.python.org/3/library/os.html#os.sync