逻辑教育.png
题目要求：建立两个求面积的类，通过实例对象比较面积的大小
from math import pi
from functools import total_ordering
import abc
#抽象基类装饰器
@total_ordering
class Shape(metaclass=abc.ABCMeta):
@abc.abstractmethod
def area(self):
pass
def __gt__(self, other):
return self.area() > other.area()
def __eq__(self, other):
return self.area() == other.area()
class Rect(Shape):
def __init__(self, w, h):
self.w = w
self.h = h
def area(self):
return self.w * self.h
def __str__(self):
return f"{self.area()}"
class Circle(Shape):
def __init__(self, r):
self.r = r
def area(self):
return self.r ** 2 * pi
def __str__(self):
return f"{self.area()}"
r = Rect(2, 3)
c = Circle(2)
print("Rect:", r)
print("Circle:", c)
print(r < c)
- 运行结果：
Rect: 6
Circle: 12.566370614359172
True
