Thanks Luke, Will do.
2009/10/26 Luke Paireepinart <rabidpoob...@gmail.com> > > > On Mon, Oct 26, 2009 at 6:07 AM, Ben Collier <bmcoll...@gmail.com> wrote: > >> Hi Luke, >> >> Thanks for that. From the code you've got there it looks like a list >> should work fine. I haven't got the code I'd been trying to hand >> (essentially assigning a new sprite to the list, but it sounds as though it >> was a python problem, not pygame) >> > > If you want to add a new sprite to a list, you can simply use the "append" > method of the list. > a = [1,2,3,4,5] > a.append(6) > print a > > results in > [1,2,3,4,5,6] > > Also look at "extend", > a = [1,2,3,4,5] > b = [6,7,8] > > print a.append(b) > [1,2,3,4,5,[6,7,8]] > > print a.extend(b) > [1,2,3,4,5,6,7,8] > > So extend is for tacking a list to the end of a list, and append is for > adding an element (which can be a list if you want.) > >> >> I shouldn't have any problems with this from now on. Thanks very much. >> Fingers crossed! >> >> From your code, you could reference sprites[5] to get the sixth sprite, >> right? >> > Yep, exactly. If you have names for your sprites, you can throw them in a > dictionary instead, so you would be able to reference them as: > > sprites['spaceship'].x = 15 > > or whatever, but if they're just 150 bullets, for example, and you want to > move them to the right on the screen, it'd be easier just to use a list and > say > for bullet in bullets: > bullet.x += 5 > > And of course there's nothing keeping you from having a dictionary of > lists, so you could do > sprites['spaceship'].x = 15 > for bullet in sprites['bullets']: > bullet.x += 5 > > Or whatever. > (I'm not sure if this is how you control sprite's positions, I don't use > Sprite very much and I mostly use Pyglet these days (but that will change > again soon.)) > > Hope that helps, > -Luke > > P.S. if you're not too familiar with Python or just starting out, come join > the Python Tutor mailing list, I'm a contributor over there and we talk > about a lot of general Python stuff (and not just really low-level stuff > either, some of the stuff they get into I don't even understand!) If you > need some great, free materials to learn, just ask over there and everyone > will be happy to direct you to the best resources available for starting > out! > > >> >> Thanks >> >> Ben >> >> 2009/10/26 Luke Paireepinart <rabidpoob...@gmail.com> >> >> >>> >>> On Mon, Oct 26, 2009 at 4:43 AM, Ben Collier <bmcoll...@gmail.com>wrote: >>> >>>> Hi, >>>> >>>> I'm fairly new to pygame, certainly haven't used it much, and up until >>>> now have been creating sprites by defining an extension to the sprite class >>>> and then instantiating each sprite by assigning it as, for example: >>>> >>>> newsprite = NewSprite(250,250) >>>> >>>> ...with the arguments that the init method uses in brackets. >>>> >>>> If I want to create, say, 150 sprites, and simply add each one to a >>>> group rather than having to have a distinct reference for each one, how do >>>> I >>>> do it? I can't seem to find an example online and I've not had much luck >>>> adding them to an array. >>>> >>> >>> Why have you not been able to add them to a list? (by the way, we call >>> them "lists" not arrays in Python) >>> Can you not just say >>> locations = [(250, 250), (100,100), (300, 300)] >>> sprites = [NewSprite(location) for location in locations] >>> spritegroup = NewSpriteGroup() >>> for sprite in sprites: >>> spritegroup.add(sprite) >>> >>> Note this is pseudocode as I don't remember the exact syntax to >>> initialize sprites, etc. but you should get the idea. Is there a problem >>> doing it this way? >>> >>> (In the future, it would be better to say "I have tried it this way, and >>> it did not work because" or "i have tried it this way and I am not sure why >>> it did not work but here is what it did" or something like this, so we have >>> some indication of what you have tried, and why it didn't work. >>> See >>> http://catb.org/~esr/faqs/smart-questions.html<http://catb.org/%7Eesr/faqs/smart-questions.html>) >>> >>> -Luke >>> >>> >> >
