an indexed list - how to do it in python

[Aahz Maruch]

In article <8n3tm2$jug$1 at nnrp1.deja.com>,  <dmost at magna.com.au> wrote:
>
>I want to create, in Python, an object that mixes the behavior of a
>sequence and a mapping. The primary behavior should be that of a
>mutable sequence, or list, but the objects in the list should also be
>accessible by a key value.

How many items?  What performance do you need?  One option would be to
write a wrapper class that maintains the info as *both* a dict and a
list.  Then the only tricky part is inserting new items by order into
the list (which will be O(N)).
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