copying classes?

[Jeff Epler]

You copied an instance, not a class.

Here's an example of attempting to deepcopy a class:
>>> class X: pass
... 
>>> import copy
>>> X is copy.deepcopy(X)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib/python2.2/copy.py", line 179, in deepcopy
    raise error, \
copy.Error: un-deep-copyable object of type <type 'class'>

In theory, one could provide a metaclass that allows copying of
instances of that metaclass.  I'll leave this as an exercise to the
reader.

Jeff
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