On Feb 25, 2:01 am, [EMAIL PROTECTED] wrote: > While working with lists of tuples is probably very common, none of my > five Python books or a Google search tell me how to refer to specific items > in each tuple. I find references to sorting a list of tuples, but not > extracting tuples based on their content. > > In my case, I have a list of 9 tuples. Each tuple has 30 items. The first > two items are 3-character strings, the remaining 28 itmes are floats. > > I want to create a new list from each tuple. But, I want the selection of > tuples, and their assignment to the new list, to be based on the values of > the first two items in each tuple. > > If I try, for example, writing: > > for item in mainlist: > if mainlist[item][0] == 'eco' and mainlist[item][1] == 'con': > ec.Append(mainlist[item][2:]) > > python doesn't like a non-numeric index. > > I would really appreciate a pointer so I can learn how to manipulate lists > of tuples by referencing specific items in each tuple (string or float). > > Rich
You might also use list comprehensions to accumulate the values you need: ec = [ item[2:] for item in mainlist if item[:2] == ['eco','con'] ] - Paddy. -- http://mail.python.org/mailman/listinfo/python-list
