练习面向对象高级特性的@Property

Author: SergioJune

test22.py

@@ -0,0 +1,108 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+'练习面向对象高级特性的@property'
+
+__author__ = 'sergiojune'
+
+
+class Student(object):
+    def __init__(self, name, score):
+        self.__name = name
+        self.__score = score
+
+    def get_name(self):
+        return self.__name
+
+    def get_score(self):
+        return self.__score
+
+    def set_name(self, name):
+        if not isinstance(name, str):
+            raise ValueError('请输入正确的名字')
+        self.__name = name
+
+    def set_score(self, score):
+        if score < 0 or score > 100:
+            raise ValueError('请输入正确的成绩')
+        elif not isinstance(score, int):
+            raise ValueError('请输入正确的成绩')
+        else:
+            self.__score = score
+
+
+stu = Student('bob', 86)
+print(stu.get_name())
+# 这个就会报错
+# stu.set_score(999)
+
+
+# 使用@property装饰器
+class People(object):
+    def __init__(self, name, age):
+        self.__name = name
+        self.__age = age
+
+    @property  # 添加装饰器，让这个方法变成一个属性
+    def age(self):
+        return self.__age
+
+    @property
+    def name(self):
+        return self.__name
+
+    @name.setter  # 这个前缀名字要和property装饰器的方法名字一致
+    def name(self, name):
+        if not isinstance(name, str):
+            raise ValueError('请输入正确名字')
+        self.__name = name
+
+
+p = People('bart', 20)
+# 加了装饰器之后这样直接调用属性
+print(p.name)  # 这个就是直接获取name属性
+p.name = 'bat'  # 直接修改属性
+print(p.name)
+print(p.age)
+# 由于age只是只读，不予许写，所以这个会报错
+# p.age = 52
+
+
+# 作业：请利用@property给一个Screen对象加上width和height属性，以及一个只读属性resolution
+class Screen(object):
+    def __init__(self):
+        self.__width = None
+        self.__height = None
+
+    @property
+    def width(self):
+        return self.__width
+
+    @property
+    def height(self):
+        return self.__height
+
+    @width.setter
+    def width(self,width):
+        if width < 0 or width > 1000:
+            raise ValueError('请输入正确的宽')
+        self.__width = width
+
+    @height.setter
+    def height(self, height):
+        if height < 0 or height > 1000:
+            raise ValueError('请输入正确的高')
+        self.__height = height
+
+    @property
+    def resolution(self):
+        self.__resolution = (self.__height, self.__width)
+        return self.__resolution
+
+
+screen = Screen()
+screen.width = 25
+screen.height = 65
+print(screen.width)
+print(screen.height)
+print(screen.resolution)