code: def get_all_users(self, path_prefix='/', marker=None, max_items=None):
          
          params = {'PathPrefix' : path_prefix}
          if marker:
              params['Marker'] = marker
          if max_items:
              params['MaxItems'] = max_items
          return self.get_response('ListUsers', params, list_marker='Users')
docs: List the users that have the specified path prefix.
  
          :type path_prefix: string
          :param path_prefix: If provided, only users whose paths match
                              the provided prefix will be returned.
  
          :type marker: string
          :param marker: Use this only when paginating results and only in
                         follow-up request after you've received a response
                         where the results are truncated.  Set this to the
                         value of the Marker element in the response you
                         just received.
  
          :type max_items: int
          :param max_items: Use this only when paginating results to indicate
                            the maximum number of groups you want in the
                            response.