class LogicGate:
    def __init__(self, name):
        self.name = name
        self.pinA = None
        self.pinB = None

    def set_pins(self, pinA, pinB):
        self.pinA = pinA
        self.pinB = pinB


class HalfAdder(LogicGate):
    def __init__(self, name):
        super().__init__(name)
        self.xor_gate = XorGate("xor1")
        self.and_gate = AndGate("and1")

    def getOutput(self):
        if self.pinA is None or self.pinB is None:
            return None
        self.xor_gate.pinA = self.pinA
        self.xor_gate.pinB = self.pinB
        self.and_gate.pinA = self.pinA
        self.and_gate.pinB = self.pinB

        ## OR, if you implemented set_pins
        self.xor_gate.set_pins(self.pinA, self.pinB)
        self.and_gate.set_pins(self.pinA, self.pinB)
        ##

        sum = self.xor_gate.getOutput()
        carry = self.and_gate.getOutput()

        return sum, carry


class BinaryGate(LogicGate):
    pass

class AndGate(BinaryGate):
    pass