def __init__(self, definition) :

        if definition.get('has missing', False) :
            self.has_missing = True
            try :
                self.predicates += [predicates.ExistsPredicate(definition['field'])]
            except __HOLE__ :
                pass
        else :
            self.has_missing = False
dataset/ETHPy150Open datamade/dedupe/dedupe/variables/base.py/Variable.__init__