'NoneType' object is not subscriptabl

I am getting below error, while executing a python script.

TypeError: ‘NoneType’ object is not subscriptable


File “C:\Users\spatn\anaconda3\lib\site-packages\streamlit\runtime\scriptrunner\script_runner.py”, line 552, in _run_script
exec(code, module.dict)

Kindly advise, what is the ERROR & HOW TO FIX THIS ?

Thank you.

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