On Thu, 26 Mar 2009 12:22:27 -0700
[email protected] wrote:
> I'm a newbie to Python. I have a list which contains integers (about
> 80,000). I want to find a quick way to get the numbers that occur in the
> list more than once, and how many times that number is duplicated in the
> list. I've done this right now by looping through the list, getting a
> number, querying the list to find out how many times the number exists, then
> writing it to a new list. On this many records it takes a couple of minutes.
> What I am looking for is something in python that can grab this info without
> looping through a list.
icount = {}
for i in list_of_ints:
icount[i] = icount.get(i, 0) + 1
Now you have a dictionary of every integer in the list and the count of
times it appears.
--
D'Arcy J.M. Cain <[email protected]> | Democracy is three wolves
http://www.druid.net/darcy/ | and a sheep voting on
+1 416 425 1212 (DoD#0082) (eNTP) | what's for dinner.
--
http://mail.python.org/mailman/listinfo/python-list
