[Python-Dev] Think a dead import finding script would be handy?

[Brett Cannon]

After Christian mentioned how we could speed up interpreter start-up
by removing some dead imports he found, I decided to write up a quick
script that generates the AST for a source file and (very roughly)
tries to find imports that are never used. People think it's worth
tossing into Tools, even if it is kind of rough? Otherwise I might
toss it into the sandbox or make a quick Google code project out of
it.

Regardless, one interesting side-effect of the script is that beyond
finding some extraneous imports in various places, it also found some
holes in __all__. I have the script look for the definition of __all__
and consider an import used if it is listed there.

-Brett