[Tutor] Newbie-Getting input from a text entry

[Don Arnold]

The problem is that the geometry managers (pack, place, and grid) return
None instead of the object they're acting on. You'll want to instantiate
your widget,  then grid() it separately:

self.code=Pmw.EntryField(self.root)
self.grid(row=0, column=1,padx=6, pady=2)

Don

----- Original Message -----
From: "richard" <python@keep-trying.com>
To: <tutor@python.org>
Sent: Friday, August 23, 2002 8:00 AM
Subject: [Tutor] Newbie-Getting input from a text entry


> 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
>
>
> _______________________________________________
> Tutor maillist  -  Tutor@python.org
> http://mail.python.org/mailman/listinfo/tutor