请问：sodier应该继承了gun的所有属性和方法。但是报错说sodier没有gun的子弹数num属性是为什么呢？

Question

class Gun(object):
def init(self, name, num):
self.name = name
self.num = num
__snum = num

def __str__(self):
    return "枪:%s" % self.name

def biubiu(self):
    if self.num > 0:  # 子弹足够
        self.num -= 1  # 子弹发射
        print("开火！biubiu~")
    else:
        print("咔咔，没子弹了")

class Fire_soldier(Gun):
def init(self, name):
self.name = name

def __str__(self):
    return "特种兵:%s" % self.name

def fire(self):
    print("%s按下扳机" % self.name)
    super(Fire_soldier, self).biubiu()

def relod(self):
    super().num += super().__snum

gun = Gun("沙漠之鹰", 7)
soldier = Fire_soldier("战狼")

soldier.fire()

print(Fire_soldier.mro)class Gun(object):

def __init__(self, name, num):
    self.name = name
    self.num = num
    __snum = num

def __str__(self):
    return "枪:%s" % self.name

def biubiu(self):
    if self.num > 0:  # 子弹足够
        self.num -= 1  # 子弹发射
        print("开火！biubiu~")
    else:
        print("咔咔，没子弹了")

class Fire_soldier(Gun):
def init(self, name):
self.name = name

def __str__(self):
    return "特种兵:%s" % self.name

def fire(self):
    print("%s按下扳机" % self.name)
    super(Fire_soldier, self).biubiu()

def relod(self):
    super().num += super().__snum

gun = Gun("沙漠之鹰", 7)
soldier = Fire_soldier("战狼")

soldier.fire()

print(Fire_soldier.mro)

Answer 1

你需要在class Fire_soldier的 __init__(): 中用  super().__init__(name,num) 调用父类的构造函数

你题目的解答代码如下：

class Gun(object):
    def __init__(self, name, num):
        self.name = name
        self.num = num
        __snum = num

    def __str__(self):
        return "枪:%s" % self.name

    def biubiu(self):
        if self.num > 0:  # 子弹足够
            self.num -= 1  # 子弹发射
            print("开火！biubiu~")
        else:
            print("咔咔，没子弹了")
class Fire_soldier(Gun):
    def __init__(self, name,num):
        super().__init__(name,num)    #调用父类的构造函数
        self.name = name

    def __str__(self):
        return "特种兵:%s" % self.name

    def fire(self):
        print("%s按下扳机" % self.name)
        super(Fire_soldier, self).biubiu()

    def relod(self):
        super().num += super().__snum
gun = Gun("沙漠之鹰", 7)
soldier = Fire_soldier("战狼",7)

soldier.fire()

print(Fire_soldier.mro)

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