65 lines
1.1 KiB
Python
65 lines
1.1 KiB
Python
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"""
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继承的应用
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- 抽象类
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- 抽象方法
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- 方法重写
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- 多态
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Version: 0.1
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Author: 骆昊
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Date: 2018-03-12
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"""
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from abc import ABCMeta, abstractmethod
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from math import pi
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class Shape(object, metaclass=ABCMeta):
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@abstractmethod
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def perimeter(self):
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pass
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@abstractmethod
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def area(self):
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pass
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class Circle(Shape):
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def __init__(self, radius):
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self._radius = radius
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def perimeter(self):
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return 2 * pi * self._radius
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def area(self):
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return pi * self._radius ** 2
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def __str__(self):
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return '我是一个圆'
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class Rect(Shape):
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def __init__(self, width, height):
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self._width = width
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self._height = height
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def perimeter(self):
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return 2 * (self._width + self._height)
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def area(self):
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return self._width * self._height
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def __str__(self):
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return '我是一个矩形'
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if __name__ == '__main__':
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shapes = [Circle(5), Circle(3.2), Rect(3.2, 6.3)]
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for shape in shapes:
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print(shape)
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print('周长:', shape.perimeter())
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print('面积:', shape.area())
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