that would be a bit of overhead too -- you'd be constantly doing reads/
writes

personally, i'd do this:

1) use a db table to maintain a list of all the people logged in as:
[ (uid,displayname,timestamp_last_action), repeat ]
2) when someone logs in / out - modify that entry , have pylons check
every so often to clear old items
3) have a hook on your display function that uses myghty cache set to
memcached , and cache that data for 2 minutes or so.  you could even
use a local memory cache.

why?
with something like this, you'd have very little db access - and you'd
never have to hit a file or a db 99% of the time.
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