# -*- coding:utf-8 -*-
"""property"""
__author__ = 'Eddie Chow'

import datetime


class Student(object):
    def __init__(self, name):
        self.name = name

    def __str__(self):
        return 'Student object (name：%s)' % self.name

    __repr__ = __str__

    # 返回不存在的属性
    def __getattr__(self, item):
        if item == 'score':
            # 默认值
            return 99
        if item == 'age':
            # 返回函数，调用方式为 age()
            return lambda: datetime.datetime.now().year - 1990
        # 默认会返回 None，这样的话就会返回一个属性异常
        raise AttributeError('Student object has no attribute %s' % item)


class Fib(object):
    def __init__(self):
        self.a, self.b = 0, 1

    def __iter__(self):
        return self

    def __next__(self):
        self.a, self.b = self.b, self.a + self.b
        if self.a > 100:
            raise StopIteration()
        return self.a


if __name__ == '__main__':
    s = Student('Eddiechow')
    # 默认调用 __str__方法
    print(s)
    # for n in Fib():
    #     print(n)
    f = Fib()
    print(f.__next__())
    print(f.__next__())
    print(f.__next__())
    print(f.__next__())
    print(f.__next__())
    # s = Student('Eddie')
    # print(s.name, s.score, s.age(), s.abc)