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#!/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)