今日作业：
1.定义一个类(不限定定义哪个类)：
要求: a.需要有一个类变量
b.需要有>=2个的对象变量
c.定义一个方法：打印类变量和对象变量
d.使用print打印对象->输出为This is a object
e.实例化两个对象：且两个对象相加等于2
f.为对象添加一个临时变量temp_var
class Person:
type="person class"
def __init__(self,name,age):
self.name=name
self.age=age
self.type="Obejict"
def __add__(self, other):
return 2
def print_info(self):
print(self.name,self.age)
def __truediv__(self, other):
return 22
def __le__(self,other):
return "this is object"
if self.age <=other.age:
return True
def __str__(self):
return "this is a"
def __eq__(self, other):
return True
zhangsan=Person("zhnagsan","20")
zhangsan.print_info()
lisi=Person("lisi","30")
print(zhangsan+lisi)
print(zhangsan / lisi)
print(zhangsan <= lisi)
print(zhangsan.type)
print(lisi.type)
zhangsan.typ="this is temp int"
print(zhangsan.typ)
print(lisi.type)
print(zhangsan)
class A:
def print_info(self):
print("this is a")
pass
class B:
def print_info(self):
print("this is b")
def say_someting(self):
print("b sying something")
pass
class C:
def say_someting(self):
print("c sying something")
pass
class D:
def print_info(self):
print("this is D")
pass
def say_someting(self):
print("d sying something")
class E(A,B,C,D):
def print_info(self):
super(C, self).print_info()
pass
print(E.__mro__)
obj=E()
obj.print_info()
obj.say_someting()
2.super的使用:
定义一个类A, 里面又一个方法print_info
定义一个类B, 里边有一个方法print_info和一个方法say_something
定义一个类C, 里边有一个方法say_something
定义一个类D, 里边有一个方法print_info和一个方法say_something
定义一个类E,继承类A, 类B, 类C，类D
实例化类E的对象
执行print_info和say_something方法
利用super，让执行print_info时调用B中print_info
利用super, 让执行say_something时调用C中say_something
利用super, 让执行print_info和say_something时调用
D中print_info和say_something
