def doesItChange(x): x = 9 def square(x): return x*x y = 1 doesItChange(y) print(y) z = 8 z = square(z) def swap(x,y): return (y,x) a = 1 b = 2 (a,b) = swap(a,b) (a,b) = (b,a) print(a) print(b)