一、迭代器实现

class myFibs(object):
    def __init__(self, control):
        self.a = 0
        self.b = 1
        self.control = control
        self.item_index = 0

    def __iter__(self):
        return self

    def __next__(self):
        if self.item_index < self.control:
            self.a, self.b = self.b, self.a + self.b
            self.item_index += 1
            return self.a
        else:
            raise StopIteration

if __name__ == "__main__":
    result = int(input("请输入要产生'斐波拉契数列'的个数："))
    myfib = myFibs(result)
    for index,item in enumerate(myfib):
        print(f"{index+1} => {item}")

二、生成器实现

def Fibs(n):
    a, b, counter = 0, 1, 0
    while True:
        if counter >= n:
            return
        a, b = b, a + b
        yield a
        counter = counter + 1

if __name__ == "__main__":
    result = int(input("请输入要产生'斐波拉契数列'的个数："))
    myfib = Fibs(result)
    for index, item in enumerate(myfib):
        print(f"{index + 1} => {item}")

三、生成器+itertools实现

import itertools

def Fibs():
    a, b = 0, 1
    while True:
        a, b = b, a + b
        yield a

if __name__ == "__main__":
    result = int(input("请输入要产生'斐波拉契数列'的个数："))
    temp = itertools.islice(Fibs(), result)
    for index, item in enumerate(temp):
        print(f"{index + 1} => {item}")

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