children = [x[0] for x in os.walk(dir)]
for f in children:
    print f + 'n'
print str(len(children)) + 'directories found'

from threading import thread
import os
import time

children = []

def fine_dirs():
    children = [x[0] for x in os.walk(dir)]
    print str(len(children)) + 'directories found'

def print_dirs():
    for f in children:
        print f + 'n'

if __name__ == "__main__":
     Thread(target = find_dirs).start()
     time.sleep(2.0)
     Thread(target = print_dirs).start()