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os.isatty()

#!/usr/bin/python3

import os, sys

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

# Write a string
str = "This is tutorialpro.org site"
os.write(fd, bytes(str, 'UTF-8'))

# Check if the file is a tty
ret = os.isatty(fd)

print("Return value: ", ret)

# Close the file
os.close(fd)

Return value:  False