Re: Calling function from another module

2010-12-16 Thread Peter Otten 
craf wrote:

 Hi.
 
 The query code is as follows:
 
 --
 import Tkinter
 import tkMessageBox
 
 
 class App:
 def __init__(self, master):
 master.protocol(WM_DELETE_WINDOW,quit)
 
 
 def quit():
 if tkMessageBox.askyesno('','Exit'):
 master.quit()
 
 
 master =Tkinter.Tk()
 app = App(master)
 master.mainloop()
 ---
 
 As you can see, when I run and close the main window displays
 a text box asking if you want to quit, if so, closes
 application.
 
 Question:
 
 Is it possible to define the quit() function in another separate
 module?.
 I tried it, but it throws the error that the global name
 'master' is not defined.

You can have the modules import each other and then access the master as
module.master where you'd have to replace module with the actual name of 
the module, but that's a bad design because 

(1) you create an import circle
(2) functions relying on global variables already are a bad idea

Your other option is to pass 'master' explicitly and then wrap it into a 
lambda function (or functools.partial):

$ cat tkquitlib.py
import tkMessageBox

def quit(master):
if tkMessageBox.askyesno('','Exit'):
master.quit()


$ cat tkquit_main.py
import Tkinter

import tkquitlib

class App:
def __init__(self, master):
master.protocol(WM_DELETE_WINDOW, lambda: tkquitlib.quit(master))

master = Tkinter.Tk()
app = App(master)
master.mainloop()

Peter
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[Fwd: Re: Calling function from another module]

2010-12-16 Thread craf 
- Mensaje reenviado 
 De: Peter Otten __pete...@web.de
 Para: python-list@python.org
 Asunto: Re: Calling function from another module
 Fecha: Thu, 16 Dec 2010 13:16:30 +0100
 Grupos de noticias: comp.lang.python
 
 craf wrote:
 
  Hi.
  
  The query code is as follows:
  
  --
  import Tkinter
  import tkMessageBox
  
  
  class App:
  def __init__(self, master):
  master.protocol(WM_DELETE_WINDOW,quit)
  
  
  def quit():
  if tkMessageBox.askyesno('','Exit'):
  master.quit()
  
  
  master =Tkinter.Tk()
  app = App(master)
  master.mainloop()
  ---
  
  As you can see, when I run and close the main window displays
  a text box asking if you want to quit, if so, closes
  application.
  
  Question:
  
  Is it possible to define the quit() function in another separate
  module?.
  I tried it, but it throws the error that the global name
  'master' is not defined.
 
 You can have the modules import each other and then access the master as
 module.master where you'd have to replace module with the actual name of 
 the module, but that's a bad design because 
 
 (1) you create an import circle
 (2) functions relying on global variables already are a bad idea
 
 Your other option is to pass 'master' explicitly and then wrap it into a 
 lambda function (or functools.partial):
 
 $ cat tkquitlib.py
 import tkMessageBox
 
 def quit(master):
 if tkMessageBox.askyesno('','Exit'):
 master.quit()
 
 
 $ cat tkquit_main.py
 import Tkinter
 
 import tkquitlib
 
 class App:
 def __init__(self, master):
 master.protocol(WM_DELETE_WINDOW, lambda: tkquitlib.quit(master))
 
 master = Tkinter.Tk()
 app = App(master)
 master.mainloop()
 
 Peter

Hi Peter.

¡Right!. Your example can separate the creation of the interface to the
code execution. Thanks for your time.

Regards

Cristian

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Calling function from another module

2010-12-15 Thread craf 
Hi.

The query code is as follows:

--
import Tkinter
import tkMessageBox


class App:
def __init__(self, master):
master.protocol(WM_DELETE_WINDOW,quit)


def quit():
if tkMessageBox.askyesno('','Exit'):
master.quit()


master =Tkinter.Tk()
app = App(master)
master.mainloop()
---

As you can see, when I run and close the main window displays
a text box asking if you want to quit, if so, closes
application.

Question:

Is it possible to define the quit() function in another separate
module?.
I tried it, but it throws the error that the global name
'master' is not defined.

Thanks in advance.

Regards

Cristian Abarzúa




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Re: Calling function from another module

2010-12-15 Thread rantingrick 
On Dec 15, 6:46 pm, craf p...@vtr.net wrote:
 Hi.

 The query code is as follows:

 --
 import Tkinter
 import tkMessageBox

 class App:
     def __init__(self, master):
         master.protocol(WM_DELETE_WINDOW,quit)

 def quit():
     if tkMessageBox.askyesno('','Exit'):
         master.quit()

 master =Tkinter.Tk()
 app = App(master)
 master.mainloop()
 ---

 As you can see, when I run and close the main window displays
 a text box asking if you want to quit, if so, closes
 application.

 Question:

 Is it possible to define the quit() function in another separate
 module?.
 I tried it, but it throws the error that the global name
 'master' is not defined.

Please explain in detail what the other module is doing. And as
written this class app looks pretty useless to me. Why subclass Tk
(well it appears you tried to subclass it anyway) just to override
capabilities that are already available within Tk?

Also i see many mistakes in this very small code sample. Using my
deductive logic leads me to believe that many mistakes in a small code
sample translates to enormous mistakes in a larger code base. So feel
free to ramble incessantly about the intricate workings of this jewel
of Python scripting you are soon to drop on this malnourished group of
coders.

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