1 import types 2 3 class Tracing: 4 def __init__(self, name, bases, namespace): 5 """Create a new class.""" 6 self.__name__ = name 7 self.__bases__ = bases 8 self.__namespace__ = namespace 9 def __call__(self): 10 """Create a new instance.""" 11 return Instance(self) 12 13 class Instance: 14 def __init__(self, klass): 15 self.__klass__ = klass 16 def __getattr__(self, name): 17 try: 18 value = self.__klass__.__namespace__[name] 19 except KeyError: 20 raise AttributeError, name 21 if type(value) is not types.FunctionType: 22 return value 23 return BoundMethod(value, self) 24 25 class BoundMethod: 26 def __init__(self, function, instance): 27 self.function = function 28 self.instance = instance 29 def __call__(self, *args): 30 print "calling", self.function, "for", self.instance, "with", args 31 return apply(self.function, (self.instance,) + args) 32 33 Trace = Tracing('Trace', (), {}) 34 35 class MyTracedClass(Trace): 36 def method1(self, a): 37 self.a = a 38 def method2(self): 39 return self.a 40 41 aninstance = MyTracedClass() 42 43 aninstance.method1(10) 44 45 print aninstance.method2() 46
