Re: [Tutor] Syntactical question / OT Lisp
> foo.py - > > import parrot > > class Bar(model.Background): > > def __initialize__(self, event): > #Just a pythoncard variant on init > self.config=self.loadCfg() > > >def loadCfg(): > #get some cfg stuff, return as dict > return cfgDict > >def on_aBtn_mouseClick(self, event): > parrot.Sketch() > > app=Bar(main.application) > app.mainloop() > > > If I wanted the function parrot.Sketch() to access that config > dictionary, I would reference it as > > foo.app.config? You could but it would be very bad practice and much better to pass the object reference into Sketch. def on_aBtn_mouseClick(self, event): parrot.Sketch(self) def Sketch(anObject): code ... configINfo = anObject.config Even better make the app object return the actual config bits that parrot needs via a method: def Sketch(anObject): ... code... myConfigItem1,mycOnfig2 = anObject.getSketchConfig() All of these options make both parrot and the foo object more easily reusable and much less liable to break when you make changes to the config data. Alan G (Back from a week's trainig camp...) ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Syntactical question / OT Lisp
Liam Clarke wrote: Hi all, I've got a module called foo.py foo.py - import parrot class Bar(model.Background): def __initialize__(self, event): #Just a pythoncard variant on init self.config=self.loadCfg() def loadCfg(): #get some cfg stuff, return as dict return cfgDict def on_aBtn_mouseClick(self, event): parrot.Sketch() app=Bar(main.application) app.mainloop() If I wanted the function parrot.Sketch() to access that config dictionary, I would reference it as foo.app.config? Is that right? Yes, after import foo but it's really ugly and a very bad idea. You should do something different like parrot.Sketch(self.config) or even put the config into a module of its own if you really want a globally available configuration. OK, so why is this so bad? Because foo and parrot depend on each other. Neither one can be used independently. You can't test parrot.Sketch() without creating a foo.app. You can't reuse parrot.Sketch() in another module named bar. You can't even restructure foo.py to make app a local variable of a main() function, for example. Don't do this. Really. This way lies spaghetti code and intractable bugs and throwing the whole mess away and starting over doing it right this time. Try to organize your modules so the dependencies form an acyclic directed graph. In other words, don't have any dependency cycles like foo depends on parrot depends on foo. Kent Regards, Liam Clarke ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Syntactical question / OT Lisp
Hi all, (side note - the net is not a luxury when attempting to learn to code) Just pondering my coding efforts, and just wanted to clarify something. I've got a module called foo.py foo.py - import parrot class Bar(model.Background): def __initialize__(self, event): #Just a pythoncard variant on init self.config=self.loadCfg() def loadCfg(): #get some cfg stuff, return as dict return cfgDict def on_aBtn_mouseClick(self, event): parrot.Sketch() app=Bar(main.application) app.mainloop() If I wanted the function parrot.Sketch() to access that config dictionary, I would reference it as foo.app.config? Is that right? Regards, Liam Clarke -- 'There is only one basic human right, and that is to do as you damn well please. And with it comes the only basic human duty, to take the consequences. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
