Indexed variables


being an almost complete Python AND programming neophyte I would like to ask
the following - very elementary, as I might suspect - question:

How do I do the following flawed things right:


def f(x):
if x == a1:
a1 = a1 + 1
elif x == a2:
a2 = a2 + 1

Now if I call f with f(a2) only a1, of course, is incremented because the
if-clause does only check for the value of the input and the values of a1
and a2 are identical.

So how do I define the function such as to discrimate wheter I call it by
f(a1) or f(a2) ?

Thank you very much,


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