import types
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class Tracing:
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def __init__(self, name, bases, namespace):
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"""Create a new class."""
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self.__name__ = name
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self.__bases__ = bases
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self.__namespace__ = namespace
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def __call__(self):
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"""Create a new instance."""
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return Instance(self)
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class Instance:
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def __init__(self, klass):
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self.__klass__ = klass
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def __getattr__(self, name):
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try:
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value = self.__klass__.__namespace__[name]
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except KeyError:
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raise AttributeError, name
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if type(value) is not types.FunctionType:
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return value
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return BoundMethod(value, self)
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class BoundMethod:
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def __init__(self, function, instance):
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self.function = function
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self.instance = instance
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def __call__(self, *args):
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print "calling", self.function, "for", self.instance, "with", args
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return apply(self.function, (self.instance,) + args)
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Trace = Tracing('Trace', (), {})
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class MyTracedClass(Trace):
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def method1(self, a):
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self.a = a
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def method2(self):
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return self.a
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aninstance = MyTracedClass()
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aninstance.method1(10)
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print aninstance.method2()
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