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from UserDict import DictMixin


class odict(DictMixin):
   
   
def __init__(self):
       
self._keys = []
       
self._data = {}
       
       
   
def __setitem__(self, key, value):
       
if key not in self._data:
           
self._keys.append(key)
       
self._data[key] = value
       
       
   
def __getitem__(self, key):
       
return self._data[key]
   
   
   
def __delitem__(self, key):
       
del self._data[key]
       
self._keys.remove(key)
       
       
   
def keys(self):
       
return list(self._keys)
   
   
   
def copy(self):
        copyDict
= odict()
        copyDict
._data = self._data.copy()
        copyDict
._keys = self._keys[:]
       
return copyDict

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