On Thu, Jun 26, 2008 at 9:27 AM, Danny Laya <[EMAIL PROTECTED]> wrote: > Hi I'm learning FOR loop now, very easy too learn. But I get confused to > understand this code : > > myList = [1,2,3,4] > for index in range(len(myList)): > myList[index] += 1 > print myList > > And the response is: > [2, 3, 4, 5] > > Can you explain me as a newbie, how that code works ?? > _______________________________________________ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor >
You define a list called myList with 4 integer elements. >>> type(myList[0]) <type 'int'> You do a for loop on the four elements. >>> len(myList) 4 Inside the for loop, you increment each element by one (+= 1). += 1 is the same as (variable = variable + 1) So, just 'play computer' and step through the for loop: 1 + 1 = 2 2 + 1 = 3 3 + 1 = 4 4 + 1 = 5 Thus the output is (2, 3, 4, 5). Still four elements, each with one added to it. Happy Programming! -- b h a a l u u at g m a i l dot c o m Kid on Bus: What are you gonna do today, Napoleon? Napoleon Dynamite: Whatever I feel like I wanna do. Gosh! _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
