Dig into variables while debugging

I am currently debugging code using Python. I have not been using Python for a while. I put some breakpoints on a variable which is an integer. Let's say this variable is X = 10. How can I:

• see what is in the variable? (I can highlight and a yellow case appears but if there are a lot of information it is not practical to display like this)
• do some manipulation of the variable, for example I would like to do X+2 and get the result?