code: def import_string(dotted_path, dotted_attributes=None):
      
      try:
          module_path, class_name = dotted_path.rsplit(".", 1)
      except ValueError:
          raise ImportError("%s doesn't look like a module path" % dotted_path)
  
      module = import_module(module_path)
  
      try:
          result = getattr(module, class_name)
      except AttributeError:
          raise ImportError(
              'Module "%s" does not define a "%s" attribute/class'
              % (module_path, class_name)
          )
  
      if not dotted_attributes:
          return result
      else:
          attributes = dotted_attributes.split(".")
          traveled_attributes = []
          try:
              for attribute in attributes:
                  traveled_attributes.append(attribute)
                  result = getattr(result, attribute)
              return result
          except AttributeError:
              raise ImportError(
                  'Module "%s" does not define a "%s" attribute inside attribute/class "%s"'
                  % (module_path, ".".join(traveled_attributes), class_name)
              )
docs: Import a dotted module path and return the attribute/class designated by the
      last name in the path. When a dotted attribute path is also provided, the
      dotted attribute path would be applied to the attribute/class retrieved from
      the first step, and return the corresponding value designated by the
      attribute path. Raise ImportError if the import failed.