Chaz Ginger <[EMAIL PROTECTED]> wrote: > I have a system that has a few lists that are very large (thousands or > tens of thousands of entries) and some that are rather small. Many times > I have to produce the difference between a large list and a small one, > without destroying the integrity of either list. I was wondering if > anyone has any recommendations on how to do this and keep performance > high? Is there a better way than > > [ i for i in bigList if i not in smallList ]
How about: smallSet = set(smallList) something = [ i for i in bigList if i not in smallSet ] Use timeit.py on some representative data to see what difference that makes. -- http://mail.python.org/mailman/listinfo/python-list
