Python 2.2b1 dicts, iteration, and subclassing

Alexis Layton alexis.layton at post.harvard.edu
Fri Nov 30 19:46:12 CET 2001


Note: Python 2.2b2 is not yet available for the Macintosh platform so 
this may have been
fixed/changed already.

I created a new-style subclass of "dictionary" ("dict" in 2.2b2) in 
which the order
of insertion of keys is remembered, the SequencedDict. I redefined the 
keys, values,
and items methods, as well as the iterkeys, itervalues, iteritems, and 
__iter__ methods.
Everything works as expected, except that it seems repr (which I did not 
redefine)
is using the built-in dictionary iteration or doing its own.

The question for all you Pythonistas out there is, should it?  To what 
extent should
the built-in behavior  of objects like dictionaries be affected by 
subclassing?

Alexis Layton
alexis.layton at post.harvard.edu




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