old_contents: import re
  
  
  def by_regex(hook, regex_tuples, default=True):
      """A filter for hooks. regex_tuples is a list of (regex, filter?) where if the regex matches
         the requested URI, then the hook is applied or not based on if filter? is True or False.
      """
      regex_res = [ (re.compile(regex), disposition) for regex, disposition in regex_tuples.iteritems() ]
      def filtered_hook(request):
          for regex, disposition in regex_res:
              if regex.matches(request.line.uri):
                  if disposition:
                      return hook(request)
                  else:
                      return request
          return default
      return filtered_hook
  
  
  def by_dict(hook, truthdict, default=True):
      """A filter for hooks.
  
      truthdict is a mapping of URI -> filter? where if the requested URI is a key in the dict, then
      the hook is applied based on the filter? value.
      """
      def filtered_hook(request):
          do_hook = truthdict.get(request.line.uri, default)
          if do_hook:
              return hook(request)
          else:
              return request
      return filtered_hook
  
new_contents: import re
  
  
  def by_regex(hook, regex_tuples, default=True):
      """A filter for hooks.
  
      regex_tuples is a list of (regex, filter?) where if the regex matches the
      requested URI, then the hook is applied or not based on if filter? is True
      or False.
  
      """
      regex_res = [ (re.compile(regex), disposition) \
                             for regex, disposition in regex_tuples.iteritems() ]
      def filtered_hook(request):
          for regex, disposition in regex_res:
              if regex.matches(request.line.uri):
                  if disposition:
                      return hook(request)
                  else:
                      return request
          return default
      return filtered_hook
  
  
  def by_dict(hook, truthdict, default=True):
      """A filter for hooks.
  
      truthdict is a mapping of URI -> filter? where if the requested URI is a
      key in the dict, then the hook is applied based on the filter? value.
  
      """
      def filtered_hook(request):
          do_hook = truthdict.get(request.line.uri, default)
          if do_hook:
              return hook(request)
          else:
              return request
      return filtered_hook
  
subject: Reformat for 80 chars