def __setitem__(self, key, value):
        dict.__setitem__(self, key, value)
        self.changed()
Test that __str__ on var works
dataset/ETHPy150Open openstack/sahara/sahara/db/sqlalchemy/types.py/MutableDict.__setitem__--crossover with--dataset/ETHPy150Open Unidata/siphon/siphon/cdmr/tests/test_dataset.py/test_var_print