# Python program to explain os.isatty() method  
  
# importing os module 
import os
  
  
# Create a pipe using os.pipe() method
# It will return a pair of 
# file descriptors (r, w) usable for
# reading and writing, respectively.
r, w = os.pipe()
  
  
# Check if file descriptor r
# is open and connected
# to a tty(-like) device
# using os.isatty() method
print("Connected to a terminal:", os.isatty(r))
  
  
  
# Open a new pseudo-terminal pair
# using os.openpty() method
# It will return master and slave 
# file descriptor for 
# pty ( pseudo terminal device) and
# tty ( native terminal device) respectively
master, slave = os.openpty()
  
# Check if file descriptor master
# is open and connected
# to a tty(-like) device 
# using os.isatty() method
print("Connected to a terminal:", os.isatty(master))

Connected to a terminal: False
Connected to a terminal: True