更新

Python-100-Days/Day01-15/Day09/shape.py

@@ -0,0 +1,66 @@
+"""
+
+继承的应用
+	- 抽象类
+	- 抽象方法
+	- 方法重写
+	- 多态
+
+Version: 0.1
+Author: 骆昊
+Date: 2018-03-12
+
+"""
+
+from abc import ABCMeta, abstractmethod
+from math import pi
+
+
+class Shape(object, metaclass=ABCMeta):
+
+	@abstractmethod
+	def perimeter(self):
+		pass
+
+	@abstractmethod
+	def area(self):
+		pass
+
+
+class Circle(Shape):
+
+	def __init__(self, radius):
+		self._radius = radius
+
+	def perimeter(self):
+		return 2 * pi * self._radius
+
+	def area(self):
+		return pi * self._radius ** 2
+
+	def __str__(self):
+		return '我是一个圆'
+
+
+class Rect(Shape):
+
+	def __init__(self, width, height):
+		self._width = width
+		self._height = height
+
+	def perimeter(self):
+		return 2 * (self._width + self._height)
+
+	def area(self):
+		return self._width * self._height
+
+	def __str__(self):
+		return '我是一个矩形'
+
+
+if __name__ == '__main__':
+	shapes = [Circle(5), Circle(3.2), Rect(3.2, 6.3)]
+	for shape in shapes:
+		print(shape)
+		print('周长:', shape.perimeter())
+		print('面积:', shape.area())