python unboundlocalerror local variable 'res' referenced before assignment

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1. [SOLVED] Local Variable Referenced Before Assignment

   

2. Local Variable Referenced Before Assignment Solved Error In Python

   

3. Local Variable Referenced Before Assignment Solved Error In Python

   

4. Local Variable Referenced Before Assignment Solved Error In Python

   

5. Python: local variable 'count' referenced before assignment

   

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