YouTipPython3 Os Fsync
# Python3.x Python3 os.fsync() Method
[ Python3 OS File/Directory Methods](#)
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### Overview
The os.fsync() method forces the file with file descriptor fd to be written to disk. On Unix, it will call the fsync() function; on Windows, it will call the _commit() function.
If you are working with a Python file object f, first call f.flush(), then os.fsync(f.fileno()), to ensure all memory associated with f is written to disk. It works on Unix and Windows.
Available on Unix and Windows.
### Syntax
The syntax for the **fsync()** method is as follows:
os.fsync(fd)
### Parameters
* **fd** -- The file descriptor.
### Return Value
This method does not return a value.
### Example
The following example demonstrates the use of the fsync() method:
#!/usr/bin/python3import 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 content os.lseek(fd, 0, 0) str = os.read(fd, 100)print ("The read string is : ", str)# Close the file os.close( fd)print ("Closed the file successfully!!")
The output of executing the above program is:
The read string is : This is test Closed the file successfully!!
[ Python3 OS File/Directory Methods](#)