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copied!<pre><code>class Proxy(object): """Proxy class wraps any other class, and adds functionality to remember and report all messages called. Limitations include that proxy blocks all direct subclass calls to: messages, number_of_times_called, was_called, _obj, and _message_counts. These calls must be made directly like my_proxy_instance._obj.messages. """ def __init__(self, target_object): print 'initializing a proxy for ' + target_object.__class__.__name__ # WRITE CODE HERE self._message_counts = Counter(); #initialize '_obj' attribute last. Trust me on this! self._obj = target_object # WRITE CODE HERE def __getattr__(self, attr_name): print 'getting an attribute: "' + attr_name + '" from "' + self._obj.__class__.__name__ + '"' self._message_counts[attr_name] += 1 print self._message_counts return object.__getattribute__(self._obj, attr_name) #def __getattribute__(self, attr_name): # print "intercepted!~ " + attr_name # object.__getattribute__(self, attr_name) def __setattr__(self, attr_name, value): if((attr_name == '_obj') | (attr_name == '_message_counts')): # special proxy attributes. print 'setting the PROXY attribute: "' + attr_name + '"' object.__setattr__(self, attr_name, value) else: print 'setting the REAL attribute: "' + attr_name + '"' self._message_counts[attr_name+"="] += 1 object.__setattr__(self._obj, attr_name, value) def messages(self): return self._message_counts.keys() def number_of_times_called(self, attr_name): return self._message_counts[attr_name] def was_called(self, attr_name): return attr_name in self._message_counts </code></pre>

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