Trying to debug code and failing miserably. Help?

Question

Ok so I saw the tutorial for the calculator in the python course and I thought "I can do this but better" (That calculator can handle up to 2 number equations)* so I tried to create a calculator that can handle more than 2 numbers at a time. The code returns 'Time limit exceeded' when run so I was wondering if anyone could help.

*E.g:
2+7 returns 9 but
2+5+2 would throw an error

https://code.sololearn.com/cguLI8xvPQi6/?ref=app
My code is kinda messy, apologies

Answer 1

This was posted recently by Slick

https://code.sololearn.com/cbaQlASs402g/?ref=app