def clear(self, ctx):
        try:
            del self._states[ctx._id_obj]
        except KeyError:
            pass
Emulation of contextlib.nested in terms of ExitStack
dataset/ETHPy150Open manahl/mdf/mdf/nodes.py/MDFNode.clear--crossover with--dataset/ETHPy150Open tbielawa/bitmath/tests/test_query_device_capacity.py/nested