Python os.fdopen() Method


Description

Python method fdopen() returns an open file object connected to the file descriptor fd. Then you can perform all the defined functions on file object.

Syntax

Following is the syntax for fdopen() method −

os.fdopen(fd, [, mode[, bufsize]]);

Parameters

Return Value

This method returns an open file object connected to the file descriptor.

Example

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

#!/usr/bin/python

import os, sys

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

# Now get a file object for the above file.
fo = os.fdopen(fd, "w+")

# Tell the current position
print "Current I/O pointer position :%d" % fo.tell()

# Write one string
fo.write( "Python is a great language.\nYeah its great!!\n");

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

# Tell the current position
print "Current I/O pointer position :%d" % fo.tell()

# Close opened file
fo.close()

print "Closed the file successfully!!"

When we run above program, it produces following result −

Current I/O pointer position :0
Read String is :  This is testPython is a great language.
Yeah its great!!

Current I/O pointer position :45
Closed the file successfully!!
python_files_io.htm