programming container object

[bambam]

I wish to create a generic container object, devlist, such that

    devlist.method(arguments)

runs as

    for each dev in devlist.pool:
        dev.method(arguments)

and
    s = devlist.method(arguments)

runs as

    for each dev in devlist.pool:
        s.append(dev.method(arguments))

...but it is outside my ability to do so.

Can anyone provide an example of how to do that?

Thanks,
Steve