def _set_expressions(self, expressions):
        self.expressions = {}
        for key, item in expressions.items():
            self.expressions[key] = {'function': item}
Make an initial pass across a set of states for DELETE.
dataset/ETHPy150Open SheffieldML/GPy/GPy/core/symbolic.py/Symbolic_core._set_expressions--crossover with--dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/orm/persistence.py/_organize_states_for_delete