Thursday, August 6, 2020

Python os.ftruncate() Method with example



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

The Python os ftruncate() method truncates the file corresponding to the file descriptor fd, so that it is at most length bytes in size.

Syntax

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

os.ftruncate(fd,  length);


Parameter Details

  • fd - File descriptor which needs to be truncated.
  • length - This is the length of the file where file needs to be truncated.

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 - This is test")

# Now you can use ftruncate() method.
os.ftruncate(fd, 10)

# 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 te
Closed the file successfully!!


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

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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Thanks for reading and bye for now.
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