面向对象的三大特性及示例说明

封装:
    1,把数据封装在对象中
        class Foo:
            def __init__(self,name,age,hobby)
                self.name = name
                self.age = age
                self.hobby = hobby
        obj = Foo('小明',18,'上山去砍柴')
    2,把相关功能封装在类中
        class Foo:
            def QQpay(self):pass
            def wechatpay(self):pass
            def alipay(self):pass
        obj = Foo()
继承:
    1,单继承
        class A:
            def func(self):pass
        class B(A):
            def func2(self):
                obj.func()
        obj = B()
        obj.func2()
    2,多继承
        class A:
            def func1(self):
                print('a,1')
        class B:
            def func1(self):
                print('b,1')
            def func2(self):
                print('b,2')
        class C(A,B):
            def func3(self):
                print('c,1')
                obj.func1()

        obj = C()
        obj.func3()

多态:
    class Foo:
        def func(arg):  #arg可以是多种数据类型
            srg.send()