1 class X: 2 def __init__(self, a, b): 3 self.a = a 4 self.b = b 5 6 def f(a, x): 7 x.a = 3 # x.b 8 print a # 2 9 print x.a # 3 10 return a + x.a 11 12 def g(x): 13 return x.a, x.b 14 15 x = X(2, 3) 16 y = f(x.a, x) 17 print y # 5 18 z = g(x) 19 print z # (3, 3)