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os.tcgetpgrp(fd)

#!/usr/bin/python3

import os, sys

# Display the current directory
print ("Current directory :%s" %os.getcwd())

# Change directory to /dev/tty
fd = os.open("/dev/tty",os.O_RDONLY)

f = os.tcgetpgrp(fd)

# Display the process group
print ("Associated process group: ")
print (f)

os.close(fd)
print ("File closed successfully!!")

Current directory :/tmp
Associated process group:
2670
File closed successfully!!