廖雪峰Python教程1轮还没学明白的（2） -- 面向对象高级编程 -- 定制类 -- 实现Fib数列的__getitem__()/切片方法

http://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000/0014319098638265527beb24f7840aa97de564ccc7f20f6000

class Fib(object):    def __getitem__(self, n):        if isinstance(n, int): # n是索引            a, b = 1, 1            for x in range(n):                a, b = b, a + b            return a        if isinstance(n, slice): # n是切片            start = n.start            stop = n.stop            if start is None:                start = 0            a, b = 1, 1            L = []            for x in range(stop):                if x >= start:                    L.append(a)                a, b = b, a + b            return L

没看明白，先挖坑标记吧