Question

how to run child process and parent process in parallel/at the same time in python using os

Answer 1

**CODE STARTS**

#library to use os functions for processes.

import os

#os.getpid() is used to pid of this process.
print("Process id before forking: {}".format(os.getpid()))

try:
   #os.fork() is used to create a new child of parent
    pid = os.fork()
except OSError:
    exit("Could not create a child process")

if pid == 0:
   #if pid==0, means we are inside child's program.
    print("In the child process that has the PID {}".format(os.getpid()))
    exit()

print("In the parent process after forking the child {}".format(pid))
#os.waitpid() is used so that parent wait for child process to die
finished = os.waitpid(0, 0)
print(finished)

**CODE END**

**CODE SNIPPET END**