code: def system_methodHelp(self, method_name: str)->str:
          
          method = None
          if method_name in self.funcs:
              method = self.funcs[method_name]
          elif self.instance is not None:
              try:
                  method = resolve_dotted_attribute(
                      self.instance,
                      method_name,
                      self.allow_dotted_names
                  )
              except AttributeError:
                  pass
          if method is None:
              return ""
          else:
              return pydoc.getdoc(method)
docs: 将docstring返回.
  
          system.methodHelp('add') => "Adds two integers together"
  
          Return:
              (str): - 函数的帮助文本