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# Python os.isatty() Method

## Description:

This method returns True if the file descriptor fd is open and connected to a tty(-like) device, else False.

## Syntax:

    os.isatty( fd )

## Parameters:

Here is the detail of parameters:

- fd: This is the file descriptor for which association needs to be checked.

## 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")

    # Now use isatty() to check the file.
    ret = os.isatty(fd)

    print "Returned value is: ", ret

    # Close opened file
    os.close( fd )

This would produce following result:

    Returned value is:  False

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