Re: [pygame] Immovable Car, and TypeError

[Frank Raiser <crashchaos@gmx.net>]

On Sat, Sep 15, 2001 at 12:33:07AM -0400, MBr8473501@aol.com wrote:
> You guys helped me out with the invisible car, and now I have that settled, 
> but now, in typical newbie fashion, I've messed up something else. Now, my 
> car doesn't move at all, and I'm getting all types of TypeErrors, such as 
> this:
> 
>   actor.erase(screen, background)
> TypeError: unbound method erase() must be called with instance as first 
> argument
> 
> I'm getting this with all kinds of code. Here's the full code, and I'll tell 
> ya when we get to what I believe to be the trouble area.

Ok.. I'm gonna try to help.. but.. *attention* I just woke up :)

>           ######!!!???All kinds of type areas in this section of 
> code???!!!######
> 
>         #Clear screen and update actors
>         for actor in [Player]:
>             actor.erase(screen, background)
>             actor.update()
> 
>         # Move the player
>         direction = keystate[K_RIGHT] - keystate[K_LEFT]
>         Player.move(direction)
> 
>           ######!!!???End what I believe to be THE SECTION???!!!######

Let's start with the for loop. Your looping over [Player] here. Now what
is Player? You may possibly think it is your game's player class instance but
no this is not the case. Note the difference between *player* and *Player*.
So what you're actually doing is setting actor to equal your Player class and
trying to call a method of a class which has not been instantiated (therefore
all methods are _unbound_)
Here's a small example for that:
>>> class A:
...     pass
... 
>>> a = A()
>>> for b in [A]:
...     print b
... 
__main__.A
>>> a
<__main__.A instance at 0x80d8db4>

You see the difference? b is the actual class A whereas a is an instance of
this class.
K.. I'll leave it to you to understand that and correct your code. If you
really don't manage to get it working.. just post again :).. but there's
nothing better than correcting one's own errors in order to learn.

========

Second problem.. your call of Player.move(direction). This is pretty much
similar. Again the same difference between *player* and *Player*.

Short summary: Take care of case sensitivity.

HTH
-- 
Raiser, Frank aka CrashChaos
IRC: 141.30.225.9:6667 #United-Programmers

"Taxation, gentlemen, is very much like dairy farming. The task is to
extract the maximum amount of milk with the minimum of moo. And I am afraid
to say that these days all I get is moo."
        -- (Terry Pratchett, Jingo)
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