How execute at least two python files at once when imported?

[Gregory Ewing]

Cameron Simpson wrote:
> I was unsure as to how serialised this was: just the import data 
> structures or the whole source-of-the-module.

It's the whole source. I found that out the hard way once -- I had
a thread that imported a module whose main code ran an event processing
loop. It stopped any other threads from running, since the import
statement never finished.

-- 
Greg