成功解决local variable 'str' referenced before assignment
成功解决local variable 'str' referenced before assignment
解决问题
local variable 'str' referenced before assignment
解决思路
局部变量'str'在赋值之前被引用
解决方法
有时候，python也会迷糊
需要再前边加入代码即可！
from builtins import str
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