Hi,
I am now reading Alan's tut on Python, before that I have read a few other tuts too.
But I am not getting functions exactly. I mean what is the difference between,

def func():
        ....

and

def func(x):
        ....

When to use which? (please do not say "returns a value" for I do not understand the meaning
of the same)

With warm regards,
-Payal
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