unboundlocalerror local variable 'groups' referenced before assignment

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1. UnboundLocalError: Local Variable Referenced Before Assignment

   

2. "Fixing UnboundLocalError: Local Variable Referenced Before Assignment"

   

3. UnboundLocalError: local variable referenced before assignment

   

4. Python 中 UnboundLocalError: Local variable referenced before assignment

   

5. UnboundLocalError: local variable ‘cls_num‘ referenced before

   

6. Error unboundlocalerror local variable referenced before assignment