更新

Python-100-Days/Day01-15/Day09/car2.py

@@ -0,0 +1,50 @@
+"""
+
+属性的使用
+	- 使用已有方法定义访问器/修改器/删除器
+
+Version: 0.1
+Author: 骆昊
+Date: 2018-03-12
+
+"""
+
+
+class Car(object):
+
+	def __init__(self, brand, max_speed):
+		self.set_brand(brand)
+		self.set_max_speed(max_speed)
+
+	def get_brand(self):
+		return self._brand
+
+	def set_brand(self, brand):
+		self._brand = brand
+
+	def get_max_speed(self):
+		return self._max_speed
+
+	def set_max_speed(self, max_speed):
+		if max_speed < 0:
+			raise ValueError('Invalid max speed for car')
+		self._max_speed = max_speed
+
+	def __str__(self):
+		return 'Car: [品牌=%s, 最高时速=%d]' % (self._brand, self._max_speed)
+
+	# 用已有的修改器和访问器定义属性
+	brand = property(get_brand, set_brand)
+	max_speed = property(get_max_speed, set_max_speed)
+
+
+car = Car('QQ', 120)
+print(car)
+# ValueError
+# car.max_speed = -100
+car.max_speed = 320
+car.brand = "Benz"
+print(car)
+print(Car.brand)
+print(Car.brand.fget)
+print(Car.brand.fset)