Wanted: mutable bitmap

[Paul Rubin]

Tom Anderson <twic at urchin.earth.li> writes:
> One thing that would be rather useful in various bits of programming
> i've done would be a mutable bitmap type. 
> Am i right in thinking there's no such thing in the standard library?
> Is there an implementation out there somewhere else? Is there a hack
> for doing it with the stuff that is in the standard library?

The obvious way is with the array module.