How to check arguments of the function?

Question

I have function defined this way:

def f1 (a, b, c = None, d = None):
    .....

How do I check that a, b are not equal

Answer 1

Why can't you refer to the values by their names?

def f1 (a, b, c=None, d=None):
    if not a.strip():
        print('a is not empty')

If you have many arguments it is worth changing function signature to:

def f2 (*args, c=None, d=None):
    for var in args:
        if not var.strip():
            raise ValueError('all elements should be non-empty')