code: def default_value(self, argname):
          
          i = _find_arg(argname, self.args)[0]
          if i is not None:
              idx = i - (len(self.args) - len(self.defaults))
              if idx >= 0:
                  return self.defaults[idx]
          i = _find_arg(argname, self.kwonlyargs)[0]
          if i is not None and self.kw_defaults[i] is not None:
              return self.kw_defaults[i]
          raise exceptions.NoDefault(func=self.parent, name=argname)
docs: Get the default value for an argument.
  
          :param argname: The name of the argument to get the default value for.
          :type argname: str
  
          :raises NoDefault: If there is no default value defined for the
              given argument.