This is me essentially doing the same thing as in my Perl playing with threads. This is more of me trying to do something in Perl and then replicate it in Python as a means of learning Python.

simple_threads.py

#!/usr/bin/env python

import sys
import threading

def process_number(func,input_list):
  x = 0
  n = 0
  for one in input_list:
    n = n + 1
    x = func(x, n, one)
  
  print "Done, result: {answer}".format(answer=x)


def main(argv):
  numlist = [5,6,4,5,2,5,6,7,4,5]
  print 'Doin\' it!'
  avgthread = threading.Thread(target=process_number, args=(lambda p,n,x: float(((p*(n-1))+x)/n), numlist))
  sumthread = threading.Thread(target=process_number, args=(lambda p,n,x: (p+x), numlist))
  
  avgthread.start()
  sumthread.start()
  avgthread.join()
  sumthread.join()
  print 'Did it!'

if __name__ == '__main__':
  main(sys.argv[1:])