code: def import_controller(string):
      
  
      # Split out the scheme and the controller descriptor
      scheme, sep, controller = string.partition(':')
      if sep != ':':
          raise ImportError("No loader scheme specified by %r" % string)
  
      # Look up a loader for that scheme
      for ep in pkg_resources.iter_entry_points('appathy.loader', scheme):
          try:
              loader = ep.load()
              break
          except (ImportError, pkg_resources.UnknownExtra):
              continue
      else:
          raise ImportError("Unable to find loader for scheme %r" % scheme)
  
      # Load the controller
      return loader(controller)
docs: Imports the requested controller.  Controllers are specified in a
      URI-like manner; the scheme is looked up using the entry point
      group "appathy.loader".  Appathy supports the "call:" and "egg:"
      schemes by default.