def _dump_sequences(self, message, key):
        """Inspect a new MHMessage and update sequences appropriately."""
        pending_sequences = message.get_sequences()
        all_sequences = self.get_sequences()
        for name, key_list in all_sequences.iteritems():
            if name in pending_sequences:
                key_list.append(key)
            elif key == key_list:
                del key_list[key_list.index(key)]
        for sequence in pending_sequences:
            if sequence not in all_sequences:
                all_sequences[sequence] = [key]
        self.set_sequences(all_sequences)
dataset/ETHPy150Open babble/babble/include/jython/Lib/mailbox.py/MH._dump_sequences/operator `in` -> `==`