local variable 'df' referenced before assignment pandas

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1. UnboundLocalError: Local Variable Referenced Before Assignment

   

2. python

   

3. Local variable referenced before assignment in Python

   

4. How to Return a Global and Local Variable from a Python Function?

   

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

   

6. [SOLVED] Local Variable Referenced Before Assignment