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Creating dictionary-like objects in Python using DictMixin

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  1. """How to create a custom mappable container (dictionary-like) type in Python."""
  2.  
  3. from UserDict import DictMixin
  4.  
  5. class MyDict(DictMixin):
  6.     # MyDict only needs to implement getitem, setitem, delitem and keys (at a 
  7.     # minimum) and UserDict will provide the rest of the standard dictionary
  8.     # methods based on these four.
  9.     #
  10.     # getitem and delitem should raise KeyError if no item exists for the given
  11.     # key. getitem, setitem and delitem should raise TypeError if the given key
  12.     # is of the wrong type.
  13.  
  14.     def __getitem__(self, key):
  15.         ....
  16.  
  17.     def __setitem__(self, key, item):
  18.         ....
  19.  
  20.     def __delitem__(self, key):
  21.         ....
  22.  
  23.     def keys(self):
  24.         ....
  25.  
  26. # You can now use your class as if it was a dict, using the standard container 
  27. # operators and dictionary methods.
  28.  
  29. d = MyDict()
  30. d[key] = value
  31. d.get(key)
  32. d.clear()
  33. etc.

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