import os
print 'Process (%s) start...' %os.getpid()
pid = os.fork()
if pid==0:
  print 'I am child (%s) and my father is %s.'%(os.getpid(),os.getppid())
else:
  print 'I (%s) just created a child process (%s).' %(os.getpid(),pid)

import os 

def child(): 
  print 'A new child:', os.getpid() 
  print 'Parent id is:', os.getppid() 
  os._exit(0) 

def parent(): 
  while True: 
    newpid=os.fork() 
    print newpid 
    if newpid==0: 
      child() 
    else: 
      pids=(os.getpid(),newpid) 
      print "parent:%d,child:%d"%pids 
      print "parent parent:",os.getppid()     
    if raw_input()=='q': 
      break 

parent()