On Thu, Dec 16, 2010 at 3:41 PM, Stefan Sonnenberg-Carstens <stefan.sonnenb...@pythonmeister.com> wrote: > return [x for x,y in > ((bad1,some_bad_condition),(bad2,some_other_bad_condition),(bad3,yet_another_bad_condition),(good1,do_some_useful_stuff() > or True)) if x][0]
This doesn't work. do_some_usefull_stuff() gets called during the tuple construction regardless of the conditions, not during the list comprehension execution as you would want. Here's my take on an unreadable one-liner: return reduce(lambda x, y: (x or (y[0]() and y[1])), [(some_bad_condition, bad1), (some_other_bad_condition, bad2), (yet_another_bad_condition, bad3), (lambda: (do_some_useful_stuff() or True), good1)], None) This of course assumes that bad1, bad2, and bad3 all evaluate as true. Cheers, Ian -- http://mail.python.org/mailman/listinfo/python-list
