#!/usr/bin/env python3
# _*_ coding:utf-8 _*_

'多重继承'

__author__ = 'chenguangyue'


class Animal(object):
    pass


# 大类
class Mammal(Animal):
    pass


class Runable(object):
    def run(self):
        print('Running...')


class Flyable(object):
    def fly(self):
        print('flying...')


class Bird(Animal):
    pass


# 各种动物
class Dog(Mammal, Runable):
    pass


class Bat(Mammal, Flyable):
    pass


class Parrot(Bird):
    pass


class Ostrich(Bird):
    pass


class Fib(object):
    def __init__(self):
        self.a, self.b = 0, 1  # 初始化两个计数器a,b

    def __iter__(self):
        return self

    def __next__(self):
        self.a, self.b = self.b, self.a + self.b
        if self.a > 100000:
            raise StopIteration()
        return self.a

    def __getitem__(self, item):
        if isinstance(item, int):
            a, b = 1, 1
            for x in range(item):
                a, b = b, a + b
            return a
        if isinstance(item, slice):
            start = item.start
            stop = item.stop
            if start is None:
                start = 0
            a, b = 1, 1

            L = []
            for x in range(stop):
                if x >= start:
                    L.append(x)
                a, b = b, a + b
            return L

    def __getattr__(self, item):
        if item == 'name':
            return 'fib'


f = Fib()

print(f.name)
print(f[3])
print(f[3:5])
# for n in Fib():
#     print(n)