local variable 'keyrtn' referenced before assignment

IMAGES

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

   

2. UnboundLocalError: Local Variable Referenced Before Assignment

   

3. Difference between Local Variable and Global Variable

   

4. python

   

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

   

6. Local variable referenced before assignment in Python