filter2

[Oleg Broytmann]

Hello!

   I want to have new python builtin - filter2. It is exactly like filter,
but it returns also a list of items that didn't pass the test.

   Of course I can do it with just "for" loop:

l1 = []
l2 = []
for item in alist:
   if test(item):
      l1.append(item)
   else:
      l2.append(item)

but this way I am missing filter's loop written in C.

   Running filter two times (with test and inverted test) is not an option,
as test could be a costly function.

   Opinions?

Oleg.
-- 
     Oleg Broytmann            http://phd.pp.ru/            phd at phd.pp.ru
           Programmers don't die, they just GOSUB without RETURN.