Re: [pygame] Name self not defined
On Tue, Jan 27, 2009 at 9:18 PM, Yanom Mobis wrote: > this is the code in question: > > class Car(Basicsprite): #car class >def __init__(self, speedarg=(0,0)): >self.speed = speedarg >Basicsprite.__init__(self) > Is this valid to call parent constructor after other statements? ( Think this is invalid in other languages -- just not sure about python ) -- Jake
Re: [pygame] Name self not defined
On Jan 28, 2009, at 4:06 PM, James Paige wrote: The "or" operator is what they call a "short circuiting" operator. If the first part is True then the second part is never evaluated. If the first part is False, then the second part is returned. Ah, the "or" idiom. Read it as "or else." I learned of this as a perl- ism of particular delight: open(FILE) or die "Can't open the file!"; perl also has inverted tests: die "The file is not there!" unless open(FILE); Not trying to start LANGUAGE WARS here, just pointing out that when the idioms line up with common natural-language idioms, it's peculiarly satisfying. Interestingly, one rarely sees people use "and" as an idiom. It will execute starting with the left-most statement, and keep going until one of them fails, then stop, executing nothing further. So you could read it as "and then"
Re: [pygame] Name self not defined
oh, thanks. --- On Tue, 1/27/09, James Paige wrote: From: James Paige Subject: Re: [pygame] Name self not defined To: pygame-users@seul.org Date: Tuesday, January 27, 2009, 9:24 PM -Inline Attachment Follows- On Tue, Jan 27, 2009 at 07:18:20PM -0800, Yanom Mobis wrote: > this is the code in question: > > class Car(Basicsprite): #car class > def __init__(self, speedarg=(0,0)): > self.speed = speedarg > Basicsprite.__init__(self) > def move(self, speedv=self.speed): > self.rect = self.rect.move(speedv) > > > however, when I try to import that class from python: > > > > >>> from basicsprite import Car > Traceback (most recent call last): > File "", line 1, in > File "basicsprite.py", line 14, in > class Car(Basicsprite): #car class > File "basicsprite.py", line 18, in Car > def move(self, speedv=self.speed): > NameError: name 'self' is not defined > > > > how can self not be defined?? You can't use "self" in the "def" line. Here is how I usually accomplish what you are trying to do: class Car(Basicsprite): #car class def __init__(self, speedarg=(0,0)): self.speed = speedarg Basicsprite.__init__(self) def move(self, speedv=None): if speedv==None: speedv = self.speedv self.rect = self.rect.move(speedv) But maybe somebody else can suggest a nicer way to do that. --- James Paige
Re: [pygame] Pathfinding
I'm just going to make my game tile-based, I guess. --- On Wed, 1/28/09, Michael George wrote: From: Michael George Subject: Re: [pygame] Pathfinding To: pygame-users@seul.org Date: Wednesday, January 28, 2009, 8:41 AM Yanom Mobis wrote: > ok, i didn't get any of that > There's a mask module in pygame with a Mask class that contains one bit per pixel. It's not in the online docs yet, but in svn head there's a method called convolve that takes in another Mask. If you start with a Mask (lets call it map) which has the corresponding bit set if there's an obstacle there, and another Mask (call it player) which has the shape of your player, then map.convolve(player) will have the (x,y) bit set if the player can be moved to (x,y). Then you can do your pathfinding in that mask with A* or whatever, and the resulting path will be one where the player never touches an obstacle. If your map is small, this will be feasible, but if it's large then building and searching a pixel-based map of the whole area will possibly take too long and you'd need to do something smarter. --Mike
Re: [pygame] Name self not defined
The "or" operator is what they call a "short circuiting" operator. If the first part is True then the second part is never evaluated. If the first part is False, then the second part is returned. --- James On Wed, Jan 28, 2009 at 04:03:27PM -0800, Yanom Mobis wrote: >how do you use the or statement in arguments? >i have never seen it done. > >--- On Wed, 1/28/09, Ian Mallett wrote: > > From: Ian Mallett > Subject: Re: [pygame] Name self not defined > To: pygame-users@seul.org > Date: Wednesday, January 28, 2009, 4:25 PM > > Frankly, I like this solution: > self.rect = self.rect.move(speedv or (0,0)) > Looks Pythonic to me.
Re: [pygame] Name self not defined
how do you use the or statement in arguments? i have never seen it done. --- On Wed, 1/28/09, Ian Mallett wrote: From: Ian Mallett Subject: Re: [pygame] Name self not defined To: pygame-users@seul.org Date: Wednesday, January 28, 2009, 4:25 PM Frankly, I like this solution: self.rect = self.rect.move(speedv or (0,0)) Looks Pythonic to me.
Re: [pygame] Name self not defined
Frankly, I like this solution: self.rect = self.rect.move(speedv or (0,0)) Looks Pythonic to me.
Re: [pygame] Name self not defined
Damn, still haven't learned to format after all these years: class Car(Basicsprite): #car class def move(self, speedv=None): self.rect = self.rect.move(speedv or (0,0))
Re: [pygame] Name self not defined
Marius Gedminas wrote: On Tue, Jan 27, 2009 at 07:24:13PM -0800, James Paige wrote: You can't use "self" in the "def" line. Here is how I usually accomplish what you are trying to do: class Car(Basicsprite): #car class def __init__(self, speedarg=(0,0)): self.speed = speedarg Basicsprite.__init__(self) def move(self, speedv=None): if speedv==None: speedv = self.speedv self.rect = self.rect.move(speedv) But maybe somebody else can suggest a nicer way to do that. The idiomatic way to express that is 'if speedv is None:'. See http://www.python.org/dev/peps/pep-0008/ Marius Gedminas Don't know how `idiomatic` or `pythonic` it is but I see a lot of people use `or` expressions: class Car(Basicsprite): #car class def move(self, speedv=None): self.rect = self.rect.move(speedv or (0,0)) no `speedv`, in (x,y) tuple format, is ever going to bool as False so if it `is None` it will use `self.speedv` of (0,0)
Re: [pygame] Alternatives to portmidi
Hi Marcus, Marcus von Appen wrote: On, Tue Jan 27, 2009, Rene Dudfield wrote: hi, This is the most portable midi library. It's also pretty small, and still has active people working on it. I thought so. Also, it's supposed to be optional for pygame. I know. Platforms like freebsd don't support midi very well at all as far as I could see. So it's a case of supporting it on platforms that support midi, and other platforms can come later -- if they support midi at all. That's right - and thus I'm wondering, whether the are alternatives to portmidi that support other platforms as well. Though my search was pretty unsuccessful so far. Regards Marcus RtMidi has Irix support as well. It has a callback mechanism for input, useful for mapping midi messages into Pygame events. Unfortunately RtMidi is written in full blown C++, including exceptions. So there is no way to provide it as a dependency in Windows. It would have to be included as source in Pygame/pgreloaded. http://www.music.mcgill.ca/~gary/rtmidi/ -- Lenard Lindstrom
Re: [pygame] Alternatives to portmidi
On, Tue Jan 27, 2009, Rene Dudfield wrote: > hi, > > This is the most portable midi library. It's also pretty small, and > still has active people working on it. I thought so. > Also, it's supposed to be optional for pygame. I know. > Platforms like freebsd don't support midi very well at all as far as I > could see. So it's a case of supporting it on platforms that support > midi, and other platforms can come later -- if they support midi at > all. That's right - and thus I'm wondering, whether the are alternatives to portmidi that support other platforms as well. Though my search was pretty unsuccessful so far. Regards Marcus pgp77826kwUSY.pgp Description: PGP signature
Re: [pygame] Name self not defined
Hey thanks for that link Marius :) For anyone who's interested, here's the suggestion he was referencing: "- Comparisons to singletons like None should always be done with 'is' or 'is not', never the equality operators." On Wed, Jan 28, 2009 at 6:15 AM, Marius Gedminas wrote: > On Tue, Jan 27, 2009 at 07:24:13PM -0800, James Paige wrote: > > You can't use "self" in the "def" line. Here is how I usually accomplish > > what you are trying to do: > > > > class Car(Basicsprite): #car class > > def __init__(self, speedarg=(0,0)): > > self.speed = speedarg > > Basicsprite.__init__(self) > > def move(self, speedv=None): > > if speedv==None: speedv = self.speedv > > self.rect = self.rect.move(speedv) > > > > > > But maybe somebody else can suggest a nicer way to do that. > > The idiomatic way to express that is 'if speedv is None:'. > See http://www.python.org/dev/peps/pep-0008/ > > Marius Gedminas > -- > lg_PC.gigacharset (lg = little green men language, PC = proxima centauri) >-- Markus Kuhn provides an example of a locale > > -BEGIN PGP SIGNATURE- > Version: GnuPG v1.4.9 (GNU/Linux) > > iD8DBQFJgGidkVdEXeem148RAkO0AJ9HCXWcvCbJeJxctMEoqVlTLXNRvQCgk1Oo > vW/kT4jEnhftgSWgEDPo5o0= > =Ijvy > -END PGP SIGNATURE- > >
Re: [pygame] Pathfinding
Yanom Mobis wrote: ok, i didn't get any of that There's a mask module in pygame with a Mask class that contains one bit per pixel. It's not in the online docs yet, but in svn head there's a method called convolve that takes in another Mask. If you start with a Mask (lets call it map) which has the corresponding bit set if there's an obstacle there, and another Mask (call it player) which has the shape of your player, then map.convolve(player) will have the (x,y) bit set if the player can be moved to (x,y). Then you can do your pathfinding in that mask with A* or whatever, and the resulting path will be one where the player never touches an obstacle. If your map is small, this will be feasible, but if it's large then building and searching a pixel-based map of the whole area will possibly take too long and you'd need to do something smarter. --Mike
Re: [pygame] Name self not defined
On Tue, Jan 27, 2009 at 07:24:13PM -0800, James Paige wrote: > You can't use "self" in the "def" line. Here is how I usually accomplish > what you are trying to do: > > class Car(Basicsprite): #car class > def __init__(self, speedarg=(0,0)): > self.speed = speedarg > Basicsprite.__init__(self) > def move(self, speedv=None): > if speedv==None: speedv = self.speedv > self.rect = self.rect.move(speedv) > > > But maybe somebody else can suggest a nicer way to do that. The idiomatic way to express that is 'if speedv is None:'. See http://www.python.org/dev/peps/pep-0008/ Marius Gedminas -- lg_PC.gigacharset (lg = little green men language, PC = proxima centauri) -- Markus Kuhn provides an example of a locale signature.asc Description: Digital signature
