Why my function is returning None?

[ndc85430]

It is important that when returning a value, always return it as a variable, and not a line of code

This really isn't a correct thing to say at all. First, returning the value of any kind of expression is perfectly fine. An expression is something that can be evaluated to produce a value: examples are: a function call as in the OP's example, a literal (like 123 or "foo", or a variable.

The problem is that the print function returns None - since its job is to print to the screen, it doesn't make sense for it to return any meaningful value.