python 闭包内函数调用外函数， 附带斐波拉契数列的实现

两种方法一种是nonlocal可以自动查找上一层的变量注意区别 global全局变量的区别；另一种利用数组实现

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Date    : 2018-11-12 10:54:17
# @Author  : Zhang Rui (1484659706@qq.com)
# @Link    : https://www.cnblogs.com/mangmangbiluo/
# @Version : $Id$

import os

def fa():
    a = 0
    b = 1
    def f2():
        nonlocal a
        nonlocal b
        c = a + b
        a, b = b, c
        # print(a)
        return a
    return f2

def fb():
    a = [0, 1]
    def f2(a=a):
        a[0], a[1] = a[1], a[0] + a[1]
        # print(a)
        return a[0]
    return f2

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

if __name__ == "__main__":
    f1 = fa()
    for i in range(10):
        a = f1()
        print(a, end=" ")
    print()

    f2 = fb()
    for i in range(10):
        a = f2()
        print(a, end=" ")
    print()

    f3 = fc()
    for i in range(10):
        print(next(f3), end=" ")
    print()

fa利用nonlocal，fb利用数组，fc是生成器的实现，下面是输出

1 1 2 3 5 8 13 21 34 55 
1 1 2 3 5 8 13 21 34 55 
1 1 2 3 5 8 13 21 34 55 
[Finished in 0.1s]