Python os.lseek() Method

Hello dear readers! Welcome back to another section of our tutorial on Python. In this tutorial guide, we are going to be studying about the Os lseek() method.

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

Syntax

The following below is the syntax for Python Os lseek() method -

os.lseek(fd,  pos,  how);

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Parameter Details

• fd - This is the file descriptor which needs to be processed.

• pos - This is the position in the file with respect to the given parameter how. 0 is used in seting the position relative to the beginning of the file, 1 to set it relative to current position, 2 to set it relative to the end of the file.

• how - The reference point within the file. 0 means beginning of the file, 1 means current position and 2 means end the file.

Return Value

It does not return any value.

Example

The following below is a simple example -

#!/usr/bin/python

import os, sys

# Open a file
fd = os.open( "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.
os.fsync(fd)

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

# Close opened file
os.close( fd )

print "Closed the file successfully!!"

Output

When the above code is executed, it will produce the following result -

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

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Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial, we are going to be studying about the Python OS lstat() Method.

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