python unboundlocalerror local variable 'rel' referenced before assignment

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1. UnboundLocalError: local variable referenced before assignment

   

2. UnboundLocalError: Local Variable Referenced Before Assignment

   

3. Python UnboundLocalError

   

4. python

   

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

   

6. [SOLVED] Local Variable Referenced Before Assignment