Python范围，字典和变量的区别？

Python scope, dictionary and variables difference?

Python镜我有同样的问题，但略有不同。

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number = 0
def incrementNumber():
number += 1

上面这个不起作用，下面这个为什么？两者都在功能范围之外。

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number = {'num':0}
def incrementNumber():
number['num'] += 1

如果我将变量作为全局变量添加，第一个变量就可以工作。

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number = 0
def incrementNumber():
global number
number += 1

看看这篇博文，它和你正在做的相似。特别是亚当的评论。

You don't assign to dictionaryVar, you assign to dictionaryVar['A'].
So it's never being assigned to, so it's implicitly global. If you
were to actually assign to dictionaryVar, you'd get the behavior you
were"expecting".