[ python-Bugs-1099746 ] copy.deepcopy barfs when copying a class derived from dict

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Bugs item #1099746, was opened at 2005-01-10 21:28
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Category: Python Library
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Doug Winter (winjer)
Assigned to: Nobody/Anonymous (nobody)
Summary: copy.deepcopy barfs when copying a class derived from dict

Initial Comment:

I've got a class:

class odict(dict):

   def __init__(self, d={}):
      self._keys = d.keys()
      dict.__init__(self, d)

   def __setitem__(self, key, item):
        dict.__setitem__(self, key, item)
        if key not in self._keys:
            self._keys.append(key)

   ...

When I copy.deepcopy one of these it blows up in
__setitem__ with an AttributeError on _keys, because
__setitem__ is called without __init__ ever having been
called.  Presumably this thing looks and smells like a
dictionary, so deepcopy thinks it is one.


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