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> Sorry, to be a little bit more descriptive. I'd like to loop from 1 to 35 > but within this loop there are divisions which I need to prefix that > particular division number. > My output would look like this: >>>>>>>>>>>>>>> 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 1 11 1 12 2 13 2 14 2 15 2 16 2 17 2 18 2 19 2 20 3 25 3 26 3 27 3 28 3 29 3 30 3 31 3 32 3 33 3 34 3 35 >>>>>>>>>>>>>>> You can't specify the blocks as just (12,20,.35) since you are using non-contiguous blocks - you have a gap between 20 and 25. So your definition needs to be (1,12),(13,20),(25,35) to specify the missing rows. But you can arguably simplify the code a little: blocks = ((1,13),(13,21),(25,36)) for prefix, block in enumerate(blocks): for n in range(*block): print prefix+1, n its very similar to your code but using tuple expansion in range() cleans it up a little bit and the names hopefully make the intent clearer. Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.amazon.com/author/alan_gauld Follow my photo-blog on Flickr at: http://www.flickr.com/photos/alangauldphotos _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor