Resolved local variable 'str' referenced before assignment

Resolved local variable 'str' referenced before assignment

Error report

I have encountered this pit in my work before, and record the problem and solution. It may not be applicable to all situations, but it can be used for your reference.
The problem description is as follows:

local variable ‘str’ referenced before assignment

local variable 'str' was referenced before assignment

Solution

You need to add code in front of it from builtins import str

PS

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