Class KeysView

Lib/_collections_abc.py:847–859

class KeysView(MappingView, Set):

    __slots__ = ()

    @classmethod
    def _from_iterable(cls, it):
        return set(it)

    def __contains__(self, key):
        return key in self._mapping

    def __iter__(self):
        yield from self._mapping


KeysView.register(dict_keys)