python unboundlocalerror local variable 'key' referenced before assignment

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1. UnboundLocalError: Local Variable Referenced Before Assignment

   

2. UnboundLocalError: local variable referenced before assignment

   

3. How to fix UnboundLocalError: local variable 'x' referenced before assignmen... in Python

   

4. [SOLVED] Local Variable Referenced Before Assignment

   

5. Python 中 UnboundLocalError: Local variable referenced before assignment

   

6. Local variable referenced before assignment Solved error in Python