What's wrong with my calculator???

Question

Help me!! I referred this code from YouTube but it's not working. Here's the link.
https://code.sololearn.com/cr75zWhAEv3v/?ref=app

Answer 1

You need to remove spaces in the operators: " + " - no, "+" - yes.

Answer 2

Trim the spaces in the operation variable

Answer 3

Thank you very much Vasiliy and Dhanush Adithya! It works!😊