How do you walk through the directories using python?

Question

I have a folder called notes, naturally they will be categorized into folders, and within those folders there will also be sub-folders for sub categories. Now my problem is

Answer 1

an alternative is to use generator, building on @ig0774's code

import os
def walk_through_files(path, file_extension='.html'):
   for (dirpath, dirnames, filenames) in os.walk(path):
      for filename in filenames:
         if filename.endswith(file_extension): 
            yield os.path.join(dirpath, filename)

and then

for fname in walk_through_files():
    print(fname)