old_contents: #! /usr/bin/env python
  
  """dwalk: walk a directory tree, printing entries hierarchically
     + top
     | > file
     | > file
     | + dir
     | | > file
     | | > file
     | | + dir
     | | | > file
     | | + dir
     | | | > file
     | | | > file
     | + dir
     | | + dir
     | | | > file"""
  
  import os
  import sys
  
  def dwalk(path, header=''):
      print header + '+ ' + path
      files = []
      dirs = []
      for e in os.listdir(path):
  	epath = os.path.join(path, e)
          if os.path.isdir(epath):
  	    # print header + '{} is a dir'.format(e)
  	    dirs.append(e)
          else:
  	    # print header + '{} is a file'.format(e)
  	    files.append(e)
      # print '{} dirs: {}'.format(header, dirs)
      # print '{} files: {}'.format(header, files)
      for f in sorted(files):
  	# print header + '| > ' + os.path.join(path, f)
          print header + '| > ' + f
      for d in sorted(dirs):
          dwalk(os.path.join(path,d), header+'| ')
  
  
new_contents: #! /usr/bin/env python
  
  # vim: set sw=4 ai et sm:
  
  """dwalk: walk a directory tree, printing entries hierarchically
     + top
     | > file
     | > file
     | + dir
     | | > file
     | | > file
     | | + dir
     | | | > file
     | | + dir
     | | | > file
     | | | > file
     | + dir
     | | + dir
     | | | > file"""
  
  import os
  import sys
  
  def dwalk(path, header=''):
      print header + '+ ' + path
      files = []
      dirs = []
      for e in os.listdir(path):
          epath = os.path.join(path, e)
          if os.path.isdir(epath):
              # print header + '{} is a dir'.format(e)
              dirs.append(e)
          else:
              # print header + '{} is a file'.format(e)
              files.append(e)
      # print '{} dirs: {}'.format(header, dirs)
      # print '{} files: {}'.format(header, files)
      for f in sorted(files):
          # print header + '| > ' + os.path.join(path, f)
          print header + '| > ' + f
      for d in sorted(dirs):
          dwalk(os.path.join(path,d), header+'| ')
  
  
subject: Convert tabs to spaces, and set up vim modeline to expand tabs going forward.