在函数内部更改全局变量就会出现此错误。
对于全局变量的修改
- 如果全局变量是int或者str，那么如果想要在函数中对函数变量进行修改，则需要先在函数内，声明其为global，再进行修改
- 如果是list或者dict则可以直接修改
摘选：https://blog.csdn.net/weixin_48419914/article/details/122008139
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