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Python os.write() Method with example

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 write() method.

Python os write() method writes the string str to the file descriptor fd. It returns the number of bytes actually written.


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

os.write(fd, str)

Parameter Details

  • fd - This is the file descriptor.
  • str - This is the string to be written.

Return Value

This method returns the number of bytes actually written.


The following below is a simple example -

# !/usr/bin/python

import os, sys

# Open file
fd = os.open("f1.txt",os.O_RDWR|os.CREAT)

# Writing text
ret = os.write(fd,"This is test")

# ret consists of number of bytes written to f1.txt
print "the number of bytes written: "
print  ret

print "written successfully"

# Close opened file
print "Closed the file successfully!!"

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

the number of bytes written:
written successfully 
Closed the file successfully!!

Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial, we are going to be discussing about the Python Exceptions Handling.

Feel free to ask your questions where necessary and i will attend to them as soon as possible. If this tutorial was helpful to you, you can use the share button to share this tutorial.

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