[Tutor] Newbie-Getting input from a text entry

[richard]

Greetings,

I am trying to retrieve a value from a text box. However I am unable to do 
so as I cannot
find the correct method to retrieve the value. When I run the script the 
GUI is created fine. The problem occurs when you press the button to 
retrieve the value. I get an error which I think is saying that the get() 
method is not valid, however it is what is used in the examples I have been 
looking at and these have worked.  I just do not understand why the value 
cannot be assigned.

Any help appreciated.

Richard


Error Message:

Exception in Tkinter callback
Traceback (most recent call last):
   File "C:\PYTHON22\lib\lib-tk\Tkinter.py", line 1292, in __call__
     return apply(self.func, args)
   File "C:\Python22\fmna4.py", line 29, in add
     print self.code.get()
AttributeError: 'NoneType' object has no attribute 'get'

Script:

# import modules to be used
from Tkinter import *
import Pmw

class GUI:
     def __init__(self):
######################################################################
         self.root = Tk()
         self.root.title('FMNA - Add/Amend/Delete')
         self.root.option_add('*Entry*background',     'lightblue')
         self.root.option_add('*font',   ('verdana', 10, 'bold'))

         Label(self.root, text='Code').grid(row=0, sticky=W)
         self.code=Pmw.EntryField(self.root).grid(row=0, column=1,padx=6, 
pady=2)

         Button(self.root, text='Quit', command=self.quit).grid(row=13, 
column=0, columnspan=2)
         Button(self.root, text='Add', command=self.add).grid(row=13, 
column=3, columnspan=2)

     def quit(self):
         import sys
         sys.quit

     def add(self):
         print self.code.get()

myGUI = GUI()
#myGUI.root.mainloop()

-----------------------------------------
Python 2.2
Platform Win32