python 3.x - String concatenate TypeError: can only concatenate str (not "int") to str"

Question

I am following a tutorial and I am getting an error.

My code should be this:

salaries = {'John':'20','Sally':'30','Sammy':'15'}
print(salaries['John'])

salaries['John'] = salaries['John'] + 30
print(salaries['John'])

I am getting back an error like this

Traceback (most recent call last): File "print.py", line 9, in salaries['John'] = salaries['John'] + 30 TypeError: can only concatenate str (not "int") to str

Can you help me with this?

Answer 1

If you wanted to include the 30 you'd have to put something like str(30). That's why it's giving you that error cause 30 is an int and the rest are strings you can't combine strings and ints. Hope this helps