my job

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

def createCounter():
    num = 0
    def counter():
        nonlocal num
        num=num+1
        return num
    return counter

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

很想问下，为什么必须加一句这行代码呢

 nonlocal num

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

nonlocal意思是告诉python，不要重新创建msg变量，而是使用outside中的msg变量来赋值。