def appendlist(self, key, value):
        self.setlistdefault(key, [])
        dict.__setitem__(self, key, self.getlist(key) + [value])
Configure rule and assign to rule set.
dataset/ETHPy150Open kdart/pycopia/aid/pycopia/dictlib.py/MultiValueDict.appendlist--crossover with--dataset/ETHPy150Open mrjoes/flask-admin/flask_admin/form/rules.py/BaseRule.configure