Friends what is my mistake?

Question

I'm a newbie, do not judge strictly) I do the calculator as it is written here in the course, but it gives an error! Help me figure out what I wrote wrong?
https://code.sololearn.com/cuLvC2Jwrg9Y/?ref=app

Answer 1

Like ~ swim ~ said you have to print your result, and also the last line would give an error because result isn't defined in the else statement.(should be omitted)