Python3) Better solutions to allow multiple lines of user input?

Question

I am coding a calculator, that would take calculations from multiple input line, if user don't use any input lines, it results to errors, my solution is try-except statement, but it needs too many lines of text, to able user type 16 lines of calculations, it needed more than 50 lines of code.

I have also tried to use loops, but first I should know, how many lines of calculations user wrote, it could be done manually by user, if user tells, how many lines of calculations (s)he wants to make.

Answer 1

Something you can do is take all input at once, as a string, then play around with it. You can compute it char by char and do actions depending on what’s happening. Take a look at this:
https://code.sololearn.com/cUEVZ6d8Z57P/?ref=app

Here’s a nice description of how to do that:
https://www.sololearn.com/learn/704/

Answer 2

https://code.sololearn.com/cL1pQ0iQIWTC/?ref=app

(The link of this code didn't fit to the description)

Answer 3

no, I already did the 150 lines for Try:Except statements