importing class
Hi all, I'm trying to import a class from a module. The class looks like this: class App: def __init__(self, master): frame = Frame(master) frame.pack() self.button = Button(frame, text=text_1, command= self.comm_1) self.button.pack(side=LEFT) self.hi_there = Button(frame, text=text_2, command=self.comm_2) self.hi_there.pack(side=LEFT) def comm_1(self): command1() root.quit() def comm_2(self): command2() root.quit() It's supposed to just make a Tkinter window with two choices. The problem is that when I import it from a module, I get the following error: NameError: global name 'Frame' is not defined But when I copy and paste it into the file, it works. Can anyone tell me what's wrong? Greg -- http://mail.python.org/mailman/listinfo/python-list
Re: importing class
Yep, that fixed it. Many thanks. Greg Dennis Lee Bieber wrote: > On 27 Oct 2006 09:22:00 -0700, [EMAIL PROTECTED] declaimed the > following in comp.lang.python: > > > It's supposed to just make a Tkinter window with two choices. The > > problem is that when I import it from a module, I get the following > > error: > > > > NameError: global name 'Frame' is not defined > > > > But when I copy and paste it into the file, it works. Can anyone tell > > me what's wrong? > > > Probably the simple fact that your "file" likely has all the imports > for Tkinter defined. The module that you are importing needs to have > those imports inside it -- imported modules do not have visibility of > names defined in the importING file. > -- > WulfraedDennis Lee Bieber KD6MOG > [EMAIL PROTECTED] [EMAIL PROTECTED] > HTTP://wlfraed.home.netcom.com/ > (Bestiaria Support Staff: [EMAIL PROTECTED]) > HTTP://www.bestiaria.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: importing class
Thanks, I got that part. The problem I'm still having is that it's not seeing things like text_1, which are defined in the program. How can I make it see that? Another question I should ask is whether I should even bother doing this. That is, it seems that the elegant and approved way of doing this kind of thing may be to put a class in a module and then just use the module over and over again in programs. I'm making a few GUIs which present two options and ask the user to chose one, so I thought I could just do it this way. Of course I could very easily just copy and paste the class into each file, but that seems silly. I haven't had any trouble using modules for functions, but for classes it is not working right so far, and I'm having trouble finding examples to follow. Greg Marc 'BlackJack' Rintsch wrote: > In <[EMAIL PROTECTED]>, gmarkowsky > wrote: > > > Hi all, > > > > I'm trying to import a class from a module. The class looks like this: > > class App: > > > > def __init__(self, master): > > > > frame = Frame(master) > > frame.pack() > > > > self.button = Button(frame, text=text_1, command= self.comm_1) > > self.button.pack(side=LEFT) > > > > self.hi_there = Button(frame, text=text_2, command=self.comm_2) > > self.hi_there.pack(side=LEFT) > > > > def comm_1(self): > > command1() > > root.quit() > > > > def comm_2(self): > > command2() > > root.quit() > > > > It's supposed to just make a Tkinter window with two choices. The > > problem is that when I import it from a module, I get the following > > error: > > > > NameError: global name 'Frame' is not defined > > > > But when I copy and paste it into the file, it works. Can anyone tell > > me what's wrong? > > Yes, the global name `Frame` is not defined. `Frame` is a name in the > `Tkinter` module and you have to import it to reference it. Add the > following import statement to your file: > > from Tkinter import Frame, Button > > You use `Button` too and this also lives in the `Tkinter` module. > > Ciao, > Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: importing class
Thanks for your help. Actually my idea was that command1 and command2
would be defined within the program, not the module, as I would have
different choices in different programs. Should I pass them in as a
parameter too?
Greg
Steve Holden wrote:
> [EMAIL PROTECTED] wrote:
> > Thanks, I got that part. The problem I'm still having is that it's not
> > seeing things like text_1, which are defined in the program. How can I
> > make it see that?
> >
> Your module is intended to work with many different main programs, so it
> shouldn't make any assumptions about the names that the main program
> uses for things. That would be rather bad programming style ("rigind
> coupling" is something to be avoided where possible). I wouldn't call
> that class App just because it's misleading: maybe you could change the
> name to YesNo, or Choice, or something more indicative of its function?
>
> You could pass text_1 and text_2 as arguments to the class's __init__
> method - that way you could just use them directly.
>
> > Another question I should ask is whether I should even bother doing
> > this. That is, it seems that the elegant and approved way of doing this
> > kind of thing may be to put a class in a module and then just use the
> > module over and over again in programs. I'm making a few GUIs which
> > present two options and ask the user to chose one, so I thought I could
> > just do it this way. Of course I could very easily just copy and paste
> > the class into each file, but that seems silly. I haven't had any
> > trouble using modules for functions, but for classes it is not working
> > right so far, and I'm having trouble finding examples to follow.
> >
> Seems like parameterization is the thing you are missing. Change the
> __init__ method declaration to
>
> def __init__(self, master, text_1="OK", text_2="Cancel"):
> ...
>
> leaving the rest of the code the same. (Though I note your module also
> fails to define a "command1" and "command2" function, this may just be
> because you are only quoting partial code).
>
> Then in your main program create the object with
>
> myDialog = YesNo(master, "Yes", "No")
>
> Looks like you are new to Python - perseverre and you will pick it up
> quite quickly!
>
> regards
> Steve
> --
> Steve Holden +44 150 684 7255 +1 800 494 3119
> Holden Web LLC/Ltd http://www.holdenweb.com
> Skype: holdenweb http://holdenweb.blogspot.com
> Recent Ramblings http://del.icio.us/steve.holden
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Simple Tkinter problem
Hi all, I'm trying to write a GUI that will put up multiple widgets in succession. My problem is that each widget also contains the previous widgets when they pop up. How do I reinitialize the widget each time so that it doesn't contain earlier ones? Actually, another question I have is, is there a way to set python so that it will assume any undefined variable is 0 or ''? That is, I have several statements like "If k > 0 then so and so" and I would like it to assume k=0 unless I tell it otherwise. I've just been defining k=0 at the start of the program but it seems there should be a better way. Greg -- http://mail.python.org/mailman/listinfo/python-list
Re: Simple Tkinter problem
Here's my Tkinter class: class TwoChoice: def __init__(self, master): frame = Frame(master) frame.pack() m = Label(root, text= maentry) m.pack() n = Label(root, text= fave) n.pack() self.button = Button(frame, text=home_team, command= self.comm_1) self.button.pack(side=LEFT) self.hi_there = Button(frame, text=vis_team, command=self.comm_2) self.hi_there.pack(side=LEFT) def comm_1(self): print home_team root.quit() def comm_2(self): print vis_team root.quit() I call it by root = Tk() gui= TwoChoice(root) root.mainloop() The next time I call it I want to just run the same thing but with different values for the variables. Instead it gives me like two copies of the widget. Greg Neil Cerutti wrote: > On 2006-11-07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > I'm trying to write a GUI that will put up multiple widgets in > > succession. My problem is that each widget also contains the > > previous widgets when they pop up. How do I reinitialize the > > widget each time so that it doesn't contain earlier ones? > > Show your code. > > > Actually, another question I have is, is there a way to set > > python so that it will assume any undefined variable is 0 or > > ''? That is, I have several statements like "If k > 0 then so > > and so" and I would like it to assume k=0 unless I tell it > > otherwise. I've just been defining k=0 at the start of the > > program but it seems there should be a better way. > > The best way to do it is to never use undefined names. > > -- > Neil Cerutti > If only faces could talk. --Pat Summerall -- http://mail.python.org/mailman/listinfo/python-list
