local variable 'start_time' referenced before assignment

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1. UnboundLocalError: Local Variable Referenced Before Assignment

   

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

   

3. python

   

4. Difference between Local Variable and Global Variable

   

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

   

6. Local variable referenced before assignment in Python