Here's what I think the author meant in discussing a control variable sample
program. <http://effbot.org/tkinterbook/entry.htm>
========================
from Tkinter import *
v=StringVar()
e = Entry(master, textvariable=v)
e.pack()
e.focus_set()
v.set("a default value")
s = v.get()
mainloop()
The problem is that Python objects with the msg:
AttributeError: 'NoneType' object has no attribute 'tk'
What corrects this? The full sample program below it runs fine:
=======================
from Tkinter import *
master = Tk()
e = Entry(master)
e.pack()
e.focus_set()
def callback():
print e.get()
b = Button(master, text="get", width=10, command=callback)
b.pack()
mainloop()
--
W. eWatson
(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet
Web Page: <www.speckledwithstars.net/>
_______________________________________________
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
