关于python:ocal variable ‘xxx’ referenced before assignment的错误解决

代码举例以下： 在函数外面定义了一个变量 xxx ，而后在函数里面引用这个变量，并改变它的值，编译器提示： Unresolved reference ‘xxx’ This inspection detects names that should resolve but don’t. Due to dynamic dispatch and duck typing, this is possible

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