types.py 文件源码

def options(self, options):
        if not isinstance(options, abc.Iterable):
            raise ValueError('Not an iterable: %r', options)
        else:
            self._options = tuple(options)
            for name in ('_default', '_value'):
                if getattr(self, name) not in self.options:
                    setattr(self, name, self.options[0])