That Python next/send demo

import glob
import os

def get_dir(path):
 
    while True:
  
        pattern = path + '/*'
        count = 1
        for file in glob.iglob(pattern):
            if os.path.isdir(file):
                print count
                count += 1
                path = yield file
                if path: break
      
        if not path: break  
          

gen = get_dir('C:/QA/Python')

print "about to next"
print next(gen)
print next(gen)
print gen.send('C:/QA')
print next(gen)

Gives:

about to next
1
C:/QA/Python\AdvancedPython
2
C:/QA/Python\Appendicies
1
C:/QA\Android
2
C:/QA\blanket