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# Python3.x Python3 os.isatty() Method [ Python3 OS File/Directory Methods](#) * * * ### Overview The os.isatty() method is used to check if the file descriptor fd is open and connected to a tty(-like) device. It returns true if it is, otherwise false. ### Syntax The syntax for the **isatty()** method is as follows: os.isatty() ### Parameters * None ### Return Value Returns true if the file descriptor fd is open and connected to a tty(-like) device, otherwise false. ### Example The following example demonstrates the use of the isatty() method: #!/usr/bin/python3import os, sys # Open a file fd = os.open( "foo.txt", os.O_RDWR|os.O_CREAT )# Write a string str = "This is site" os.write(fd,bytes(str, 'UTF-8'))# Use isatty() to check the file ret = os.isatty(fd)print ("Return value: ", ret)# Close the file os.close( fd ) The output of executing the above program is: Return value: False [ Python3 OS File/Directory Methods](#)