> Still got a question. This notation/syntax of the list: > > [ item for i, item in data if i in columns ] > > is quite new for me. Can someone point me to more examples of this use > Or give me the name of it (it must have a name) so i can google it?
Its a list comprehension, and theres a short explanation of them in the functional programming topic of my tutor. But there is one twist in this one, the comma after i: item for i,item in data... that makes the i,item a tuple. Normally we see a single thing there: [n for n in list] But if the list is a list of pairs(tuples) we can unpack the tuple into the two names: L = [(1,2),(3,4),(5,6)] print [i for i,j in L] should print [1,3,5] The first element of each tuple. Alan G Author of the Learn to Program web tutor http://www.freenetpages.co.uk/hp/alan.gauld _______________________________________________ Tutor maillist - [EMAIL PROTECTED] http://mail.python.org/mailman/listinfo/tutor
