unboundlocalerror local variable 'err' referenced before assignment

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1. UnboundLocalError: Local Variable Referenced Before Assignment

   

2. Python 中 UnboundLocalError: Local variable referenced before assignment 错误_迹忆客

   

3. UnboundLocalError: local variable referenced before assignment

   

4. 【已解决】Bug9. UnboundLocalError: local variable 'A' referenced before assignment

   

5. python

   

6. How to fix UnboundLocalError: local variable 'x' referenced before assignment in Python