Python: split a list based on a condition?

Question

What's the best way, both aesthetically and from a performance perspective, to split a list of items into multiple lists based on a conditional? The equivalent of:

good = [x for x in mylist if x in goodvals] 

bad = [x for x in mylist if x not in goodvals]

is there a more elegant way to do this?

Update: here's the actual use case, to better explain what I'm trying to do:

# files looks like: [ ('file1.jpg', 33L, '.jpg'), ('file2.avi', 999L, '.avi'), ... ] 

IMAGE_TYPES = ('.jpg','.jpeg','.gif','.bmp','.png') 

images = [f for f in files if f[2].lower() in IMAGE_TYPES] 

anims = [f for f in files if f[2].lower() not in IMAGE_TYPES]

Answer 1

To split a list based on a condition you can use the below-mentioned code:-

good, bad = [], [] 

for x in mylist:

(bad, good)[x in goodvals].append(x)