Python os.lseek() Method


Python method lseek() sets the current position of file descriptor fd to the given position pos, modified by how.


Following is the syntax for lseek() method −

os.lseek(fd, pos, how)


Return Value

This method does not return any value.


The following example shows the usage of lseek() method.


import os, sys

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

# Write one string
os.write(fd, "This is test")

# Now you can use fsync() method.
# Infact here you would not be able to see its effect.

# Now read this file from the beginning
os.lseek(fd, 0, 0)
str =, 100)
print "Read String is : ", str

# Close opened file
os.close( fd )

print "Closed the file successfully!!"

When we run above program, it produces following result −

Read String is :  This is test
Closed the file successfully!!