text: """This module contains a code example related to
  
  Think Python, 2nd Edition
  by Allen Downey
  http://thinkpython2.com
  
  Copyright 2015 Allen Downey
  
  License: http://creativecommons.org/licenses/by/4.0/
  """
  
  from __future__ import print_function, division
  
  import os
  
  
  def walk(dirname):
      """Prints the names of all files in dirname and its subdirectories.
  
      This is the version in the book.
  
      dirname: string name of directory
      """
      for name in os.listdir(dirname):
          path = os.path.join(dirname, name)
  
          if os.path.isfile(path):
              print(path)
          else:
              walk(path)
  
  
  def walk2(dirname):
      """Prints the names of all files in dirname and its subdirectories.
  
      This is the exercise solution, which uses os.walk.
  
      dirname: string name of directory
      """
      for root, dirs, files in os.walk(dirname):
          for filename in files:
              print(os.path.join(root, filename))
  
  
  if __name__ == '__main__':
      walk('.')
      walk2('.')
      
  