[Python知识库]CH1_与或门

问题描述：

熟悉抽象数据类型（ADT）的表示，结合1.4 Python基础复习Python中列表 、字符串、元组、字典等内置数据类型的方法，以逻辑门电路实现为例（下图），补全OrGate和NotGate类（参考代码书P31--P37中AndGate类的写法），并运行完整程序，电路输入如下图，给出输出结果，验证你电路的逻辑正确性。

?

没有教材的同学，可参考https://runestone.academy/runestone/books/published/pythonds/Introduction/ObjectOrientedProgramminginPythonDefiningClasses.html#inheritance-logic-gates-and-circuits

我的答案：

涉及一些父子类的应用，定义类LogicGate逻辑门，其下有子类BinaryGate和UnaryGate（双元和单元门），双元门又包括与门和或门，单元门包括非门。

?

?具体代码实现为：

class LogicGate:

    def __init__(self,n):
        self.name = n
        self.output = None

    def getLabel(self):
        return self.name

    def getOutput(self):
        self.output = self.performGateLogic()
        return self.output


class BinaryGate(LogicGate):

    def __init__(self,n):
        super(BinaryGate, self).__init__(n)

        self.pinA = None
        self.pinB = None

    def getPinA(self):
        if self.pinA == None:
            return int(input("Enter Pin A input for gate "+self.getLabel()+"-->"))
        else:
            return self.pinA.getFrom().getOutput()

    def getPinB(self):
        if self.pinB == None:
            return int(input("Enter Pin B input for gate "+self.getLabel()+"-->"))
        else:
            return self.pinB.getFrom().getOutput()

    def setNextPin(self,source):
        if self.pinA == None:
            self.pinA = source
        else:
            if self.pinB == None:
                self.pinB = source
            else:
                print("Cannot Connect: NO EMPTY PINS on this gate")


class AndGate(BinaryGate):

    def __init__(self,n):
        BinaryGate.__init__(self,n)

    def performGateLogic(self):

        a = self.getPinA()
        b = self.getPinB()
        if a==1 and b==1:
            return 1
        else:
            return 0

class OrGate(BinaryGate):

    def __init__(self,n):
        BinaryGate.__init__(self,n)

    def performGateLogic(self):

        a = self.getPinA()
        b = self.getPinB()
        if a ==1 or b==1:
            return 1
        else:
            return 0

class UnaryGate(LogicGate):

    def __init__(self,n):
        LogicGate.__init__(self,n)

        self.pin = None

    def getPin(self):
        if self.pin == None:
            return int(input("Enter Pin input for gate "+self.getLabel()+"-->"))
        else:
            return self.pin.getFrom().getOutput()

    def setNextPin(self,source):
        if self.pin == None:
            self.pin = source
        else:
            print("Cannot Connect: NO EMPTY PINS on this gate")


class NotGate(UnaryGate):

    def __init__(self,n):
        UnaryGate.__init__(self,n)

    def performGateLogic(self):
        if self.getPin():
            return 0
        else:
            return 1


class Connector:

    def __init__(self, fgate, tgate):
        self.fromgate = fgate
        self.togate = tgate

        tgate.setNextPin(self)

    def getFrom(self):
        return self.fromgate

    def getTo(self):
        return self.togate

根据题目的要求写出主程序

def main():
   g1 = AndGate("G1")
   g2 = AndGate("G2")
   g3 = OrGate("G3")
   g4 = NotGate("G4")
   c1 = Connector(g1,g3)
   c2 = Connector(g2,g3)
   c3 = Connector(g3,g4)
   print(g4.getOutput())

main()