#!/usr/bin/env python3

import threading   # nomen est omen
import time        # sleep, etc.

#
# function to run asynchronous
#
def do_work(tNumber=0):
    print("starting  thread # %s", tNumber)
    rr = 1.0
    if (tNumber==0):
      time.sleep(10)             # sleeping 10 seconds
    else:
      while (1==1):              # doing heavy stuff
        rr = 1.0/(1.0+rr)
    print("finishing thread # %s", tNumber)

#
# main
#
allThreads = list()
for i in range(5):
  x =threading.Thread(target=do_work, args=(i,))
  allThreads.append(x)
  x.start()                      # starting thread 
#
for i in range(len(allThreads)):
  allThreads[i].join()           # waiting for threads to finish
#
print("\n# all done folks")