On Wednesday, September 21, 2016 at 12:30:49 AM UTC-7, Meinolf wrote: > > OMG, Is this normal????? > i got chills telling me it had something to do with the *For Loop*, > played around with the LBs and UBs and the following worked: > > * for i in range(-1, (len(getcourseids)-1)):* > * c = db.item.id <http://db.item.id>==getcourseids[i].item_id* > * s.append(db(c).select(db.item.course_title)[i])* > > Now i'm puzzled as to why give a lower bound of -1 for the range, will > this keep on working or my code could later crash???? I put it under a > *Try..Except > * block though..please help if there's a safer alternative, this is new > to me and sort of contradicts what i know of starting from 0. > > The normal Python way of writing a loop on a list is: for id in getcourseid: c = db.item.id == id.item_id s.append(db(c).select(db.item.course_title)) Giving an explicit range would be appropriate if you were processing only a portion of the list, but there you could use Python slices to do that: for id in getcourseid[3:7]: etc
As for your effort to use villas' suggestion, you should have replace his " values" with your "item_id". You might want to scan Chapter 3 for some examples of Python coding and web2py queries. <URL:http://web2py.com/books/default/chapter/29/03/overview#An-image-blog> and just below that, the wiki example, especially def show: and the pagecomments query. /dps -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
