没人发现这个a,b的值应该是=0，1吗？还是我错了（卑微）

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#1 Created at ... [Delete] [Delete and Lock User]

class Fib(object):
    def __getitem__(self, n):
        a, b = 1, 1
        for x in range(n):
            a, b = b, a + b
        return a

#2 Created at ... [Delete] [Delete and Lock User]

n=0的时候不执行循环，直接返回a

#3 Created at ... [Delete] [Delete and Lock User]

谢谢！找到知识漏洞了！