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在继承中,子类会自动获得一份父类的所有属性和方法,同时还可以定义自己的属性和方法。 对于构造函数的定义会有以下几种情况: 1、父类有构造函数,子类没有 class Base: def __init__(self, name, age): self.m_Name = name self.m_Age = 10 self.m_Address = 'China' pass def PrintName(self): print('My name is ' + self.m_Name) pass class Derived(Base): pass derived = Derived()改代码运行会出现错误: 更改之后代码如下: class Base: def __init__(self, name, age): self.m_Name = name self.m_Age = 10 self.m_Address = 'China' pass def PrintName(self): print('My name is ' + self.m_Name) pass class Derived(Base): pass derived = Derived('Foer Kent', 18) print(derived.m_Age) derived.PrintName()执行结果为: 会出现错误: 注意:Python中多态的重写方法问题,重写的方法只要方法名相同,参数列表中个数不同,也相当于发生了重写,如果想调用父类中的方法,而不是子类中的方法,将用到以下要讲的super()函数。 多态可参照https://blog.csdn.net/Falcont/article/details/115695910 属性分类可参照https://blog.csdn.net/Falcont/article/details/115696093 3、父类中有构造函数,子类中有,且通过super()函数进行关联 class Base: def __init__(self, name, age): self.m_Name = name self.m_Age = 10 self.m_Address = 'China' pass def PrintName(self): print('My name is ' + self.m_Name) pass class Derived(Base): def __init__(self, name, age): super(Derived, self).__init__(name, age) pass pass derived = Derived('Foer Kent', 18) print(derived.m_Age) derived.PrintName()super(子类名,self).init(value1,value2),此处参数列表不需要self,只需要与父类中除self之外的相同即可。super后面的()中参数可以不写。即直接super().init(父类中构造函数除了self以外的形参) 此时将显示: |
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