arbitrary number of arguments in a function declaration

[rbt]

How do I set up a function so that it can take an arbitrary number of 
arguments? For example, I have a bunch of expenses which may grow or 
shrink depending on the client's circumstance and a function that sums 
them up... hard coding them is tedious. How might I make this dynamic so 
that it can handle any amount of expenses?

def tot_expenses(self, e0, e1, e2, e3):
    pass
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