I *know* this already exists, but I can't remember where: def pivot(func, seq): # I know, a good implementation shouldn't call func() twice per item return ( (x for x in seq if func(x)), (x for x in seq if not func(x)) )
I feel like I read a thread in which this was argued to death, and I can't find that either. The scenario: I have a sequence of lines from a file. I want to split it into those lines that contain a substring, and those that don't. I want it to be more efficient and prettier than with = [x for x in lines if substring in x] without = [x for x in lines if substring not in x] Does this exist? TIA, Michael -- http://mail.python.org/mailman/listinfo/python-list
