Python---day8作业
作者:互联网
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
def print_info(self):
print("类变量:", Person.type)
print("对象变量:", self.name, self.age)
def __str__(self):
return "This is a object"
def __add__(self, other):
return 2
zhangsan = Person("zhangsan", 18)
print(zhangsan)
lisi = Person("lisi", 20)
print(zhangsan + lisi)
zhangsan.print_info()
zhangsan.type = "temp_var"
print(zhangsan.type)
This is a object
2
类变量: Person Class
对象变量: zhangsan 18
temp_var
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
class A:
def print_info(self):
print("This is A")
class B:
def say_somthing(self):
print("B says something")
def print_info(self):
print("This is B")
class C:
def say_somthing(self):
print("C says something")
class D:
def say_somthing(self):
print("D says something")
def print_info(self):
print("This is D")
class E(A, B, C, D):
实例化类E的对象
执行print_info和say_something方法
obj = E()
obj.print_info()
obj.say_somthing()
利用super,让执行print_info时调用B中print_info
class E(A, B, C, D):
def print_info(self):
super(A, self).print_info()
obj = E()
obj.print_info()
obj.say_somthing()
This is B
B says something
利用super, 让执行say_something时调用C中say_something
class E(A, B, C, D):
def say_somthing(self):
super(B, self).say_somthing()
obj = E()
obj.print_info()
obj.say_somthing()
C says something
利用super, 让执行print_info和say_something时调用
D中print_info和say_something
class E(A, B, C, D):
def print_info(self):
super(C, self).print_info()
def say_somthing(self):
super(C, self).say_somthing()
obj = E()
obj.print_info()
obj.say_somthing()
This is D
D says something
print(E.__mro__)
(<class '__main__.E'>, <class '__main__.A'>, <class '__main__.B'>, <class '__main__.C'>, <class '__main__.D'>, <class 'object'>)
标签:info,day8,Python,self,---,say,something,print,def 来源: https://blog.csdn.net/m0_56175629/article/details/121257439