Steven D'Aprano wrote:

def swap(a, b):
    a, b = b, a

x = 1
y = 2
swap(x, y)
assert (x == 2) and (y==1)

Can't the same point be more simply made with this example:

def setval(a):
    a = 12345

x = 1
setval(x)
print x

?
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