[Python] Python: Default Argument [closed]

Why is it that when i run (on VS code):

def add(a, b):
return a+ b

add()


I receive a Traceback (as I should), but when I run:

def add(a, b):
return a + b
add(7, 8)


no return value is displayed except I invoke print(add(7, 8)) what's the difference between add() and add(7, 8)?

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