Tkinter - tk_focusNext broken for years?

[Helmut Jarausch]

Hi,

I'd like to bind the '<Return>' event to a function
which does some calculations (like a database lookup)
and then invoke tk_focusNext.
I get an exception as many others have reported earlier, see
http://bugs.python.org/issue799428
There has even a patch been suggested. Why hasn't it been fixed -
I haven't seen a fix.
The problem can be reproduced by the following tiny script
I'm using Python 2.5.1 .

Should I fixed the Tkinter source myself or is there a workaround?

Many thanks for your help,
Helmut.
-------------------------------------------
import Tkinter as Tk

def Proc_Enter(Even t) :
print "Enter - normally lookup a database"
Event.widget.tk _focusNext()

root= Tk.Tk()
Tk.Label(root,t ext='Name').gri d(column=0,row= 0,sticky=Tk.W)
Nm_input= Tk.StringVar()
Nm_entry= Tk.Entry(root,t extvariable=Nm_ input)
Nm_entry.bind(' <Return>',Proc_ Enter)
Nm_entry.grid(c olumn=1,row=0,s ticky=Tk.W)

Tk.Label(root,t ext='City').gri d(column=0,row= 1,sticky=Tk.W)
City_input= Tk.StringVar()
City_entry= Tk.Entry(root,t extvariable=Cit y_input)
City_entry.bind ('<Return>',Pro c_Enter)
City_entry.grid (column=1,row=1 ,sticky=Tk.W)

Tk.mainloop()
-------------------------------------------

>>>>>>>>>>>>

Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/lib/python2.5/lib-tk/Tkinter.py", line 1403, in __call__
return self.func(*args )
File "FocusBug.p y", line 6, in Proc_Enter
Event.widget.tk _focusNext()
File "/usr/lib/python2.5/lib-tk/Tkinter.py", line 479, in tk_focusNext
return self._nametowid get(name)
File "/usr/lib/python2.5/lib-tk/Tkinter.py", line 1064, in nametowidget
if name[0] == '.':
TypeError: '_tkinter.Tcl_O bj' object is unsubscriptable
-------------------------------------------

--
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany