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#!/usr/bin/env python3

# -*- coding: utf-8 -*-

'练习面向对象的实例属性和类属性'

__author__ = 'sergiojune'

class Student(object):

# 这个就是类属性

name = 'student_name'

def __init__(self,age):

# 有self的就是实例属性

self.age = age

s1 = Student(15)

s2 = Student(16)

# 都是调用类属性

print(Student.name)

print(s1.name)

print(s2.name)

# 修改类属性

Student.name = '_name'

# 全部都变

print(Student.name)

print(s1.name)

print(s2.name)

# 若绑定同名的实例属性到实例中

s1.name = "name_s1"

# 类属性没有变

print(Student.name)

# 同名属性将类属性屏蔽了

print(s1.name)

# 此实例还有类属性

print(s2.name)

# 作业：为了统计学生人数，可以给Student类增加一个类属性，每创建一个实例，该属性自动增加

class Stu(object):

num = 0

def __init__(self,name):

Stu.num += 1

self.name = name

s1 = Stu('Bob')

s2 = Stu('Tom')

print(s2.num)