How to memoize functions?

[Aahz]

In article <roy-95CD9F.12505927062003 at reader1.panix.com>,
Roy Smith  <roy at panix.com> wrote:
>In article <mailman.1056726010.29497.python-list at python.org>,
> sismex01 at hebmex.com wrote:
>>
>> Or, use a shelf instead of a dictionary.
>
>What's a shelf?

It's a layer on top of a Berkeley database.  See the shelve module docs.
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