[Tutor] Developing GUI-programs using IDLE

Sun, 21 Oct 2001 01:53:59 +0200

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Hi folks!

I'd like to develop GUI-programs with Tkinter
using IDLE. (Remark: I'm running Python under
WindowsNT)

Apparently there arise problems from the fact,
that IDLE itself is a Tkinter-program.

Running the following program (taken from life-preserver):

from Tkinter import *                                                    =

                                                                         =

class Application(Frame):                                                =

    def say_hi(self):                                                    =

                print "hi there, everyone!"                              =

                                                                         =

    def createWidgets(self):                                             =

                self.QUIT =3D Button(self)                               =
 =20
                self.QUIT["text"] =3D "QUIT"                             =
 =20
                self.QUIT["fg"]   =3D "red"                              =
=20
                self.QUIT["command"] =3D  self.quit   # crucial point =
No. 1             =20
                                                                       =20
                self.QUIT.pack({"side": "left"})                       =20
                                                                       =20
                self.hi_there =3D Button(self)                           =
=20
                self.hi_there["text"] =3D "Hello",                       =
=20
                self.hi_there["command"] =3D self.say_hi                 =
=20
                                                                       =20
                self.hi_there.pack({"side": "left"})                   =20
                                                                       =20
                                                                       =20
    def __init__(self, master=3DNone):                                   =
=20
                Frame.__init__(self, master)                           =20
                self.pack()                                    =20
                self.createWidgets()                                   =20
                                                                       =20
app =3D Application()                                                    =
=20
app.mainloop()   # crucial point No. 2                    =20

results in:
   a) if I press the QUIT-button IDLE collapses as a whole
   b) if I click on the window-closing 'x' (right upper corner)
      the programs window closes, but the REP-loop of IDLE does
      not return, so I have to kill it via the Task-Manager
      (I don't know how to kill the running program alone)

if I delete (comment out) the last statement:=20
app.mainloop()
   a) remains the same
   b) (seemingly) works well: window closes,=20
      new prompt in IDLE appears

if I try to remedy point a) above by replacing self.quit
by self.destroy (assuming self to be App that is Frame)
something very strange occurs: pressing the QUIT-button results
in disappearance of BOTH buttons, and the empty Frame-window remains
on the screen. Now I also can remove the Frame by using 'x'

I would appreciate very much
 a) an explanation of this weird behaviour
 b) a directive for how to handle mainloop() in the given
    circumstances
 c) a statement (method-call) that causes the Application
    to close and exit properly without killing IDLE

Otherwise developing GUI-programs with IDLE would be rather
uncomfortable.

Gregor Lingl

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<DIV><FONT face=3D"Courier New" size=3D2>Hi folks!</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Courier New" size=3D2>I'd like to develop =
GUI-programs with=20
Tkinter</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>using IDLE. (Remark: I'm =
running Python=20
under</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>WindowsNT)</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Courier New" size=3D2>Apparently there arise problems =
from the=20
fact,</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>that IDLE itself is a=20
Tkinter-program.</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Courier New" size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Courier New" size=3D2>Running&nbsp;the following =
program (taken=20
from life-preserver):</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Courier New" size=3D2>from Tkinter import=20
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>class=20
Application(Frame):&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp; def=20
say_hi(self):&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;=20
print "hi there,=20
everyone!"&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp; def=20
createWidgets(self):&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;=20
self.QUIT =3D=20
Button(self)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;=20
self.QUIT["text"] =3D=20
"QUIT"&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;=20
self.QUIT["fg"]&nbsp;&nbsp; =3D=20
"red"&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;=20
self.QUIT["command"] =3D&nbsp; self.quit&nbsp;&nbsp;&nbsp;# crucial =
point No.=20
1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
self.QUIT.pack({"side":=20
"left"})&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;=20
self.hi_there =3D=20
Button(self)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;=20
self.hi_there["text"] =3D=20
"Hello",&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;=20
self.hi_there["command"] =3D=20
self.say_hi&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;=20
self.hi_there.pack({"side":=20
"left"})&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp; def __init__(self,=20
master=3DNone):&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;=20
Frame.__init__(self,=20
master)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;=20
self.pack()&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;=20
self.createWidgets()&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;=20
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>app =3D=20
Application()&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>app.mainloop()&nbsp;&nbsp;&nbsp;# crucial point=20
No.&nbsp;2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR></FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Courier New" size=3D2>results in:</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>&nbsp;&nbsp; a) if I press the =
QUIT-button=20
IDLE collapses as a whole</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>&nbsp;&nbsp; b) if I click on =
the=20
window-closing 'x' (right upper corner)</FONT></DIV>
<DIV><FONT face=3D"Courier New" =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;the=20
programs window closes, but the REP-loop of IDLE does</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
not return,=20
so I have to kill it via the Task-Manager</FONT></DIV>
<DIV><FONT face=3D"Courier New" =
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(I=20
don't know how to kill the running program alone)</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Courier New" size=3D2>if I delete (comment =
out)&nbsp;the last=20
statement: </FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>app.mainloop()</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>&nbsp;&nbsp; a) remains the=20
same</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>&nbsp;&nbsp; b) (seemingly) =
works well:=20
window closes, </FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
new prompt=20
in IDLE appears</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Courier New" size=3D2>if I try to remedy&nbsp;point =
a) above by=20
replacing self.quit</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>by self.destroy (assuming self =
to be=20
App&nbsp;that is&nbsp;Frame)</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>something very strange occurs: =
pressing the=20
QUIT-button results</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>in disappearance of BOTH =
buttons, and the=20
empty Frame-window remains</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>on the screen. Now I also can =
remove the=20
Frame by using 'x'</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>&nbsp;</DIV></FONT>
<DIV><FONT face=3D"Courier New" size=3D2>I would appreciate very =
much</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>&nbsp;a) an explanation of this =
weird=20
behaviour</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>&nbsp;b) a directive for how to =
handle=20
mainloop() in the given</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>&nbsp;&nbsp;&nbsp;=20
circumstances</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>&nbsp;c) a statement =
(method-call) that=20
causes the Application</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>&nbsp;&nbsp;&nbsp; to close and =
exit=20
properly without killing IDLE</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Courier New" size=3D2>Otherwise developing =
GUI-programs with IDLE=20
would be rather</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2>uncomfortable.</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Courier New" size=3D2>Gregor Lingl</FONT></DIV>
<DIV><FONT face=3D"Courier New" =
size=3D2></FONT>&nbsp;</DIV></BODY></HTML>

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