1 class C: 2 def f(self): 3 print self 4 return self.value() 5 6 def value(self): 7 return 123 8 9 c = C() 10 11 class D: 12 f = c.f 13 14 d = D() 15 16 def fn(): 17 return 456 18 19 class E: 20 f = fn 21 g = C.f 22 23 e = E() 24 25 # Normal method access and invocation. 26 27 print c.f.__name__ # f 28 print c.f() # <__main__.C instance> 29 # 123 30 31 # Access and call assigned bound method. 32 33 print d.f.__name__ # wrapper 34 print d.f() # <__main__.C instance> 35 # 123 36 37 # Access and call assigned function. 38 39 print e.f.__name__ # fn 40 print e.f() # 456 41 42 # Access details of assigned method. 43 44 print e.g.__name__ # f 45 46 # Attempt to call method belonging to another class via an incompatible 47 # instance. In Python, this would be an unbound method call attempt. 48 49 try: 50 print e.g() 51 except TypeError: 52 print "e.g(): e is an incompatible instance for E.g which is C.f" 53 54 g = get_using(E.g, c) 55 print g.__name__ # f 56 print g() # <__main__.C instance> 57 # 123
