[Tutor] Multipane windows using curses
Dear All, I am looking for some advice about a design decision. I want to write a curses-based editor (for OWL ontologies). This should then be usable via ssh, etc. Ontology files may be large, and quite complex. Current editors (e.g. Protege) have multiple tabs to cope with this. The simplest option would seem to be to have a single appliction, running through a single terminal. However, the data is often complex, and so it would be nice to have multiple terminals showing different bits of the ontologies at the same time. However, doing this with multiple instances of the app would be difficult, as each window would have to load the whole ontolog, etc. My next thought was then to run a simple server that loads the data file and returns bits of it. Then one could open multiple ssh terminals, and each could run a client to allow one to view the data. However, this is obviously more complex. Am I missing something simpler? Thanks, Matt Sent from my BlackBerry® wireless device ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] For loop breaking string methods
On 04/27/10 12:19, Dave Angel wrote: Note also that if you insert or delete from the list while you're looping, you can get undefined results. That's one reason it's common to build a new loop, and just assign it back when done. Example would be the list comprehension you showed earlier. I have to add to Dave's statement, if you modify the list's content while looping there is no undefined behavior; you get undefined behavior if you modify the list's structure. Operations that modify a list's structure includes insertion, delete, append, etc; those operations which can modify the len() of list. Modifying the content, however, is perfectly safe. However, even when just modifying list's content, I personally still prefer list/generator comprehension. They're fast and simple. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] For loop breaking string methods
On 4/26/2010 10:19 PM, Dave Angel wrote: Note also that if you insert or delete from the list while you're looping, you can get undefined results. The results are not undefined. They m,ight be unexpected, but that is due to an invalid assumption. The behavior is explained in section 7.3 of The Python Language Reference. Note especially: There is a subtlety when the sequence is being modified by the loop (this can only occur for mutable sequences, i.e. lists). An internal counter is used to keep track of which item is used next, and this is incremented on each iteration. When this counter has reached the length of the sequence the loop terminates. This means that if the suite deletes the current (or a previous) item from the sequence, the next item will be skipped (since it gets the index of the current item which has already been treated). Likewise, if the suite inserts an item in the sequence before the current item, the current item will be treated again the next time through the loop. This can lead to nasty bugs that can be avoided by making a temporary copy using a slice of the whole sequence, e.g., for x in a[:]: if x0: a.remove(x) -- Bob Gailer 919-636-4239 Chapel Hill NC ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Modify inherited methods
I'm writing a class that inherits the inbuilt dict class and want some of my own code to run at initialisation, on the other hand, I still want the original dict.__init__ function to run. Can I ask the class to run the original __init__ and then my own function at initialisation automatically? If so, how? Regards, Colin Caine ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Modify inherited methods
On Wed, 28 Apr 2010 07:24:48 am C M Caine wrote: I'm writing a class that inherits the inbuilt dict class and want some of my own code to run at initialisation, on the other hand, I still want the original dict.__init__ function to run. Can I ask the class to run the original __init__ and then my own function at initialisation automatically? If so, how? This is the general technique for calling the superclass' method: class MyDict(dict): def __init__(self, *args, **kwargs): # Call the superclass method. dict.__init__(self, *args, **kwargs) # Perform my own initialisation code. print Calling my init code... For advanced usage, replace the call to dict.__init__ with a call to super: super(MyDict, self).__init__(*args, **kwargs) And for guru-level mastery, replace to call to dict.__init__ with ... nothing at all, because dict.__init__ doesn't do anything. Some people argue that you must call dict.__init__ even though it doesn't do anything. Their reasoning is, some day its behaviour might change, and if you don't call it in your subclass, then your class may break. This is true, as far as it goes, but what they say is that if the behaviour of dict.__init__ changes, and you *do* call it, your class may still break. (This is why dict is unlikely to change any time soon.) -- Steven D'Aprano ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Modify inherited methods
On Wed, 28 Apr 2010 08:08:12 am Steven D'Aprano wrote: Some people argue that you must call dict.__init__ even though it doesn't do anything. Their reasoning is, some day its behaviour might change, and if you don't call it in your subclass, then your class may break. This is true, as far as it goes, but what they say is that if the behaviour of dict.__init__ changes, and you *do* call it, your class may still break. (This is why dict is unlikely to change any time soon.) Oops, left out a word. I meant to say what they *don't* say is -- Steven D'Aprano ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Modify inherited methods
Steven D'Aprano st...@pearwood.info wrote On Wed, 28 Apr 2010 07:24:48 am C M Caine wrote: I'm writing a class that inherits the inbuilt dict class and want some of my own code to run at initialisation, on the other hand, I still want the original dict.__init__ function to run. ... This is the general technique for calling the superclass' method: class MyDict(dict): def __init__(self, *args, **kwargs): # Call the superclass method. dict.__init__(self, *args, **kwargs) # Perform my own initialisation code. print Calling my init code... And just to be clear that applies to any method not just __init__ Also you can do your intialisation before or after or both. eg. def __init__() # do local pre processing(optional) super().__init__(...) # do local post processing(optional) Some people argue that you must call dict.__init__ even though it doesn't do anything. Their reasoning is, some day its behaviour might change, and if you don't call it in your subclass, then your class may break. I tend to argue for calling even if its a null call. Mainly because you sometimes don't know what the superclass does or doesn't do (eg you might not have access to the source) so its safer to call it... the behaviour of dict.__init__ changes, and you *do* call it, your class may still break. ... and if it breaks you at least have access to your own code to fix it... But if you do have access to the superclass source then you can make an informed decision. In general I'm too lazy to go looking for it and just put the super call in :-) HTH, -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] How can I display my float as a string???
Here is my code, I need to display my float value as a string. item.set_prix str(float(prix)) Thank You -- Marc-O. Rompré ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] (no subject)
Oups my posting was too big!!! On Tue, Apr 27, 2010 at 11:04 PM, Marco Rompré marcodrom...@gmail.comwrote: Why is none of my items button works In this, I have two files and in my second file I imported all the function of the first one Here is my codes and my error code for the two files please help me: Traceback (most recent call last): File F:\School\University\Session 4\Programmation SIO\magasingolfvues.py, line 426, in module app = App(racine, magasinmodele.txt) File F:\School\University\Session 4\Programmation SIO\magasingolfvues.py, line 23, in __init__ ItemsFrame(contexte, item) NameError: global name 'item' is not defined 1st fil called magasingolfmodele.py: # -*- coding: utf-8 -*- # # magasingolfmodele.py # # Magasin de golf -- Items de golf # Magasin de golf (nom, items, ville) # Items de golf(nom, prix) # # naming standards: http://www.python.org/dev/peps/pep-0008/ # class Magasin: Le concept magasin pour la gestion d'inventaire des items de golf. def __init__(self, nom =, items =[], ville= ): self.nom = nom self.items = items self.ville = ville def set_nom(self, nom): self.nom = nom nom = property(None, set_nom) def set_items(self, items): self.items = items items = property(None, set_items) def set_ville(self, ville): self.ville = ville ville = property(None, set_ville) def __str__(self): return self.nom class Item: Le concept item pour la gestion d'inventaire des items de golf. def __init__(self, nom =, prix = 100): self.nom = nom self.prix = prix def set_nom(self, nom): self.nom = nom nom = property(None, set_nom) def set_prix(self, prix): self.prix = prix prix = property(None, set_prix) def __str__(self): return self.nom def initialiser(self): item01 = Item (Ensemble de fers Titleist) item01.set_prix(1099.99) item02 = Item (Ensemble de fers Callaway) item02.set_prix(1299.99) item03 = Item (Ensemble de fers Taylormade Burner Graphite) item03.set_prix(2499.99) item04 = Item (Ensemble de fers Cobra) item04.set_prix(999.99) item05 = Item (Ensemble de fers Ping) item05.set_prix(1399.99) item06 = Item (Ensemble de fers Ben Hogan) item06.set_prix(1199.99) items = [item01, item02, item03, item04, item05, item06] magasin01.set_items(items) items = [item01, item03, item04, item06] magasin02.set_items(items) items = [item01, item02, item03, item05] magasin03.set_items(items) magasins = [magasin01, magasin02, magasin03] self.set_magasins(magasins) self.sauvegarder() def afficher(self): print() print(Magasins) for magasin in self.magasins: print() print(magasin) print() for item in magasin.items: print(item) for prix in item.prix: print(prix) if __name__ == '__main__': modele = Modele(magasinmodele.txt) modele.charger() if modele.vide(): modele.initialiser() modele.afficher() Here's the code of my second file: # -*- coding: utf-8 -*- # # magasingolfvues.py # # naming standards: http://www.python.org/dev/peps/pep-0008/ # from Tkinter import * from magasingolfmodele import * class App: Application illustrant le concept d'un magasin de golf et des items qu'il vend. def __init__(self, contexte, nom_fichier): self.contexte = contexte self.modele = Modele(nom_fichier) self.modele.charger() if self.modele.vide(): self.modele.initialiser() MagasinsFrame(self) ItemsFrame(contexte, item) class ItemsFrame(Toplevel): Liste des items. def __init__(self, contexte, items): Toplevel.__init__(self, contexte) self.contexte = contexte self.items = items self.title(Gestion des items de golf) titre = Label(self, text = Bâtons de golf disponibles (nom)) titre.pack() self.liste = Listbox(self) for items in self.items: self.liste.insert(END, items) self.liste.pack() self.afficher_item_bouton = Button( self, text = Item, fg = blue, command = self.afficher_item ) self.afficher_item_bouton.pack(side = LEFT) self.ajouter_item_bouton = Button( self, text = Ajouter, fg = blue, command = self.ajouter_item ) self.ajouter_item_bouton.pack(side=LEFT) self.afficher_item_bouton = Button( self, text = Modifier,
Re: [Tutor] How can I display my float as a string???
On 04/28/10 12:35, Marco Rompré wrote: Here is my code, I need to display my float value as a string. item.set_prix str(float(prix)) print prix ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] (no subject)
On Tue, Apr 27, 2010 at 10:12 PM, Marco Rompré marcodrom...@gmail.com wrote: Oups my posting was too big!!! On Tue, Apr 27, 2010 at 11:04 PM, Marco Rompré marcodrom...@gmail.com wrote: Why is none of my items button works In this, I have two files and in my second file I imported all the function of the first one Here is my codes and my error code for the two files please help me: Traceback (most recent call last): File F:\School\University\Session 4\Programmation SIO\magasingolfvues.py, line 426, in module app = App(racine, magasinmodele.txt) File F:\School\University\Session 4\Programmation SIO\magasingolfvues.py, line 23, in __init__ ItemsFrame(contexte, item) NameError: global name 'item' is not defined [snip lots of code] You're not going to get a very good reply with a post like this. First of all, it's homework, so we aren't going to give you answers (not that we would anyway). Secondly, if you have a problem, you need to clearly specify what the problem is, and clearly outline what you did to try to solve it, and why you think that didn't work, and some general indication that you are trying things. We're not here to just give people answers, we're here to help you when you get stuck learning on your own. It's much more rewarding in the end, trust me. Also why do you think the problem you're having is your items button [doesn't] work when it's pretty clear from the traceback that your code crashes due to trying to access a variable that doesn't exist? -Luke ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
