call-by-reference function parameters

Question

Given a function:

def A(a, b, c):
    a *= 2
    b *= 4
    c *= 8
    return a+b+c

How can I set the \'c\' var to be called-by-reference,

Answer 1

All calls in Python are "by reference". Integers are immutable in Python. You can't change them.

class C:
   def __init__(self, c):
       self.c = c
   def __call__(self, a, b):
       a *= 2
       b *= 4
       self.c *= 8
       return a + b + self.c

Example

A = C(1)
print A(1, 1), A.c
print A(1, 1), A.c

Output

14 8
70 64