Question

我正在观看Bucky's Python Programming教程。他解释了子类和父类的概念，如下所示：

class Dad:
    var1 = "Hey I'm Dad"

class Mum:
    var2 = "Hey I'm Mum"

class Child(Mum, Dad):
    var3 = "Hey I'm a Child"

这，我完全理解。然而，他然后将类转换为对象：

childObject = Child()

dadObject = Dad()

如果他可以致电Child.var3以获得与childObject.var3相同的结果，为什么他会这么做呢？

Answer 1

更好的例子是

class Person:
    name="Person"
    def speak(self):
        print "Hi! Im %s"%slf.name

class Dad(Person):
     name = "Dad"

class Mom(Person):
     name = "Mom"

class Child(Person):
     name = "a Child"
     age  = 5
     def speak(self):
        print "Hewwo, I am a %d year old child!"%self.age

d = Dad()
m = Mom()
c = Child()

c.speak()
m.speak()
d.speak()

关于差异（您的静态类访问与实例访问的问题）

class Child:
   var3 = "whatever"

c = Child()
c.var3 = "something_else"

print c.var3
print Child.var3

Python中的子类和父类

1 个答案: