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1. Could you give some code examples for that?
2,3. Did you notice that google search for "from __main__
import" give hits similar to: 
  t = Timer("test()", "from __main__ import test")
in most situations?
I think it's hard to value uses of "from..." based on google
search or similar method.Maybe we shoud ask on python-list
what are the others opinions?

>As a middle ground it might be a good idea to expand the
>patch to reduce pdb's dependency on module global symbols
I'am interesting how would you do that?