code: def get(self, name_or_klass):
          
          if not isinstance(name_or_klass, str):
              name_or_klass = name_or_klass.__name__
          return self._extensions[name_or_klass]
docs: Get a extension by name (or class).
  
          :param name_or_klass: The name or the class of the extension to get
          :type name_or_klass: str or type
          :rtype: spyder.api.mode.EditorExtension