def print_name(name):print(name)print(print_name('Annabel Lee'))

Why do I get the following output:

Annabel Lee
None

More precisely, from where does the word None come from?

You have two calls to print: one inside print_name and another outside the function's scope.

The one inside print_name() prints the name passed in. The one on the outside prints what the function print_name returns - which is None as you have no return statement. Presuming you want only one printed output, you'd return it instead of printing it in the function:

def print_name(name):return nameprint(print_name('Annabel Lee'))

Or just call print_name without wrapping it in a print function.