Answer 1

if o == "+":
elif o == "-":
...

Inputs are strings and you need strings to compare them with.

Answer 2

Algfish31 do not ask for upvotes,t here is a high probability you will get downvotes,and why did you marked your comment as best?
Russ answer should have been marked as best ,

Answer 3

No problem.

Answer 4

4*2 says 8

Answer 5

Algfish31 after testing it out only I said that ,again tested it's still showing 8

Answer 6

Oh ok ,you posted a comment 16 minutes ago saying it's showing 2 ,so I thought you were still facing problem

Answer 7

Try the exception Handling here, so that it will become more simple for users.

Answer 8

No need of using def
https://code.sololearn.com/cfSXu74DXbem/?ref=app

Answer 9

Easy

Answer 10

hello