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# Python os.fdopen() Method

## Description:

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

## Syntax:

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

## Parameters:

Here is the detail of parameters:

- fd: This is the file descriptor for which a file object is to be returned.

- mode: This optional argument is a string indicating how the file is to be opened. The most commonly-used values of mode are 'r' for reading, 'w' for writing (truncating the file if it already exists), and 'a' for appending.

- bufsize: This optional argument specifies the file's desired buffer size: 0 means unbuffered, 1 means line buffered, any other positive value means use a buffer of (approximately) that size.

## Example:

    #!/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!!"

This would produce 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!!

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