I'm really blocked right now, and I don't want to post this to the main Python list since I think the answer is probably right in front of my face. I'm clearly just too close to see it.
I'm able to do frequency counts of items in a list by doing the following: >>> list = ["5100", "5100", "5100", "5200", "5200"] >>> count = {} >>> for l in list: ... count[l] = count.get(l, 0) + 1 ... >>> count {'5200': 2, '5100': 3} >>> Hooray, right?! However, my real problem is dealing with another dimension of data. So suppose I can access the following data: "5100", "foo" "5100", "-" "5100", "-" "5100", "-" "5200", "foo" "5200", - That's a total of 6 line records that I want to output like this: 5100 - 3 5100 foo 1 5200 - 1 5200 foo 1 I want to count the frequency of the second column of data that I can access. I can't seem to get any traction as how to figure this out. Should I put the data in a list of dictionaries? A dictionary of lists? How do I call the data if there are all kinds of duplicate keys? When the data's in some data structure how do I iterate over it to get frequency of column B? Really confused. Can someone help? _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor