def discard(self, key):
        try:
            self.remove(key)
        except KeyError:
            pass
Fillup should work ok.
dataset/ETHPy150Open babble/babble/include/jython/Lib/mailbox.py/Mailbox.discard--crossover with--dataset/ETHPy150Open google/textfsm/textfsm_test.py/UnitTestFSM.testFillup