Tkinter: manipulating data in 'entry' widgets.

[David Allen]

In article <mailman.980556332.23522.python-list at python.org>, "jerry keeney"
<jerryleekeeney at yahoo.com> wrote:

> Hopefully this is'nt a repeat of an oft discussed item:
> 
> I have a Tkinter program with 3 entry widgets.  I would like to take the
> numbers entered in the first two, total them and display them in the 3rd (or
> even just as a label).
> 
> I believe the idea is to capture the entry with a DoubleVar, but beyond that
> I'm not sure.  
> 
> I have been perusing the various places on the web discussing Tkinter, and I
> cannot find that sort of detail.  Any pointers where I can get this info on
> the web??

What's wrong with this?

entry3.delete(0, 'end')
entry3.insert("%0.2f" % 
              (float(entry1.get()) + 
               float(entry2.get())))

-- 
David Allen
http://opop.nols.com/
----------------------------------------
"As soon as we started programming, we found to our surprise that it wasn't as 
easy to get programs right as we had thought. Debugging had to be discovered. 
I can remember the exact instant when I realized that a large part of my life 
from then on was going to be spent in finding mistakes in my own programs." 
	- Maurice Wilkes discovers debugging, 1949