Tkinter problem
Chad Netzer
cnetzer at sonic.net
Sun Jun 22 19:34:26 EDT 2003
On Sun, 2003-06-22 at 07:02, Eirik wrote:
> What does the "if __name__=='__main__':" mean? I do not fully understand
> this example.
For the example I gave, you can ignore it (and remove the indenting
below). But it is used in cases where you want to be able to import a
script (to get at its function definitions), as well as run it as a
script.
Basically, when you run a script, the __name__ global is equal to
'__main__', so the example doesn't execute those lines if you import the
script. It is a common idiom.
Here is the example just as a straightforward script. Let me know if it
makes the issue you asked about (setting up the proper callback) more
clear.
import sys
from Tkinter import *
def my_test_callback():
global root
root.t.set("Test-Text")
root = Tk()
root.t = StringVar()
root.l1 = Label(root, textvariable = root.t)
root.b1 = Button(root, text = "Button", command = my_test_callback)
root.bE = Button(root, text = "End", command = sys.exit)
root.l1.grid()
root.b1.grid()
root.bE.grid()
root.mainloop()
--
Chad Netzer <cnetzer at sonic.net>
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