gundlach wrote:
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?
The clearest way is just:
def pivot(func, seq):
with, without = [], []
for x in seq:
if func(x):
with.append(x)
else:
without.append(x)
return with, without
--
http://mail.python.org/mailman/listinfo/python-list
