Python design pattern series: recursive data structures

I introduce a recursive structure in which you can create and object, and add to it at will.

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1. class ObjectProxy(object):  
2.     def __init__(self, dictionary=None):  
3.         if dictionary:  
4.             for a, b in dictionary.items():  
5.                 if isinstance(b, (list, tuple)):  
6.                     setattr(self, a, [ObjectProxy(x)\  
7.                     if isinstance(x, dict) else x for x in b])  
8.                 else:  
9.                     setattr(self, a, ObjectProxy(b)\  
10.                     if isinstance(b, dict) else b)  
11.   
12.     def __repr__(self):  
13.         return '<objectproxy [%s]="">' % ', '.join(self.__dict__.keys())  
14.       
15.     def __getattr__(self, attr):  
16.         try:  
17.             return dict.__getattr__(self, attr)  
18.         except:  
19.             if not self.__dict__.has_key(attr):  
20.                 self.__dict__[attr] = ObjectProxy()  
21.             return self.__dict__[attr]  
22.           
23.     def __setattr__(self, attr, value):  
24.         if self.__dict__.has_key(attr) or '__' in attr:  
25.             dict.__setattr__(self, attr, value)  
26.         else:  
27.             self.__dict__[attr] =  value  
28.   
29. a = ObjectProxy()  
30. a.b.c.d = 3  
31. a.m.d_ = 2  
32.   
33.   
34. </objectproxy>  

class ObjectProxy(object):
    def __init__(self, dictionary=None):
        if dictionary:
            for a, b in dictionary.items():
                if isinstance(b, (list, tuple)):
                    setattr(self, a, [ObjectProxy(x)\
                    if isinstance(x, dict) else x for x in b])
                else:
                    setattr(self, a, ObjectProxy(b)\
                    if isinstance(b, dict) else b)

    def __repr__(self):
        return '' % ', '.join(self.__dict__.keys())
    
    def __getattr__(self, attr):
        try:
            return dict.__getattr__(self, attr)
        except:
            if not self.__dict__.has_key(attr):
                self.__dict__[attr] = ObjectProxy()
            return self.__dict__[attr]
        
    def __setattr__(self, attr, value):
        if self.__dict__.has_key(attr) or '__' in attr:
            dict.__setattr__(self, attr, value)
        else:
            self.__dict__[attr] =  value

a = ObjectProxy()
a.b.c.d = 3
a.m.d_ = 2