python unboundlocalerror local variable 'set' referenced before assignment

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1. UnboundLocalError: local variable referenced before assignment

   

2. UnboundLocalError: Local Variable Referenced Before Assignment

   

3. Python :Python 3: UnboundLocalError: local variable referenced before

   

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

   

5. UnboundLocalError: local variable referenced before assignment

   

6. python