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Message: [QUOTE="Sean, post: 3897193"] I have a huge list, 10,000,000+ items. Each item is a dictionary with fields used to sort the list. When I have completed sorting I want to grab a page of items, say 1,000 of them which I do easily by using list_data[x:x+1000] Now I want to add an additional key/value pair to each dictionary in the list, incrementing them by 1 each time. So, if I grabbed page 2 of the list I would get: [{'a':'a', 'b':'b', 'position':1001}, {'c':'c', 'd':'d', 'position': 1002}, ...] Any way to do that with list comprehension? Any other good way to do it besides iterating over the list? Thanks [/QUOTE]