def __init__(self, current_dict, past_dict):
        self.current_dict, self.past_dict = current_dict, past_dict
        self.current_keys, self.past_keys = [
            set(d.keys()) for d in (current_dict, past_dict)
        ]
        self.intersect = self.current_keys.intersection(self.past_keys)
Iitialize the differ.
dataset/ETHPy150Open saltstack/salt/salt/states/cyg.py/DictDiffer.__init__