__init__.py 文件源码

def unregister(cls, key) -> Store:
        """
        Opposite of :meth:`.register`. :exc:`.KeyError` may raised if key not found in registry.

        :param key: The store key to remove from stores registry.

        """
        if key == cls._default:
            cls._default = None

        if key in _factories:
            return _factories.pop(key)
        else:
            raise KeyError('Cannot find store: %s' % key)