Python os.dup() 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 dup() method.

Python os dup() method returns a duplicate of the file descriptor fd which can be used in place of the original descriptor.

Syntax

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

os.dup( fd );

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Parameter Details

• fd - This is the original file descriptor.

Return Value

This method returns a duplicate of the original file descriptor.

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 )

# Get one duplicate file descriptor
d_fd = os.dup( fd )

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

# Close a single opened file
os.closerange( fd, d_fd)

print "Closed all the files successfully!!"

Output

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

Closed all the files 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 dup2() Method.

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