[Tutor] Error message with testing Tkinter

[Double Six]

Hi,

I'm learning Tkinter with the following code on Mac OS X 10.4:

from Tkinter import *
from sys import stdout, exit
widget = Button(None, text = 'Hello?', command=(lambda:
stdout.write('Hello?\n') or exit()))
widget.pack()
widget.mainloop()

I do successfully get a GUI with a button, but the problem is if
I click the button, the GUI window hangs there with the
following message message in the console:

Hello?

Traceback (most recent call last):
  File "/Users/gangc/Python_Scripting/test.py", line 7, in
-toplevel-
widget.mainloop()
  File
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/lib-tk/Tkinter.py",
line 965, in mainloop
self.tk.mainloop(n)
  File
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/lib-tk/Tkinter.py",
line 1347, in __call__
raise SystemExit, msg
SystemExit

What am I missing?

Any help will be highly appreciated,
Joe


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[Tutor] Creating Tkinter Menubars

[Double Six]

Hi,

I am testing the following Tkinter code (attached at the end of
this message) by Fredrik Lundh on a Mac OS X 10.4.2 with Python
version 2.3. I do get a root window, but it is totally blank
without the desirable menubars such as File and Edit. What am I
missing?

Any help will be highly appreciated.

Thanks,
Joe

=

from Tkinter import *

class AppUI(Frame):

def __init__(self, master=None):
Frame.__init__(self, master, relief=SUNKEN, bd=2)

self.menubar = Menu(self)

menu = Menu(self.menubar, tearoff=0)
self.menubar.add_cascade(label="File", menu=menu)
menu.add_command(label="New")

menu = Menu(self.menubar, tearoff=0)
self.menubar.add_cascade(label="Edit", menu=menu)
menu.add_command(label="Cut")
menu.add_command(label="Copy")
menu.add_command(label="Paste")

try:
self.master.config(menu=self.menubar)
except AttributeError:
# master is a toplevel window (Python 1.4/Tkinter
1.63)
self.master.tk.call(master, "config", "-menu",
self.menubar)

self.canvas = Canvas(self, bg="white", width=400,
height=400,
 bd=0, highlightthickness=0)
self.canvas.pack()


root = Tk()

app = AppUI(root)
app.pack()

root.mainloop()




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Re: [Tutor] Creating Tkinter Menubars

[Double Six]

Hi Michael,

Thank you very much for the help.

I tried the simpler code you provided, but unfortunatly I still
got a blank window without any trace of menubars.

Any other insights?

Thanks,
Joe



from Tkinter import *

root = Tk()
menubar = Menu(root)
menu = Menu(menubar, tearoff=0)
menubar.add_cascade(label="File", menu=menu)
menu.add_command(label="New")
menu = Menu(menubar, tearoff=0)
menubar.add_cascade(label="Edit", menu=menu)
menu.add_command(label="Cut")
menu.add_command(label="Copy")
menu.add_command(label="Paste")
root.config(menu=menubar)
root.mainloop()



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 On Wed, 16 Nov 2005, Michael Lange ([EMAIL PROTECTED])
wrote:

> On Tue, 15 Nov 2005 16:17:53 -0500
> Double Six <[EMAIL PROTECTED]> wrote:
> 
> > Hi,
> > 
> > I am testing the following Tkinter code (attached at the end
of
> > this message) by Fredrik Lundh on a Mac OS X 10.4.2 with
Python
> > version 2.3. I do get a root window, but it is totally blank
> > without the desirable menubars such as File and Edit. What
am I
> > missing?
> > 
> 
> 
> It works well for me (on linux, python-2.3), maybe a mac
specific thing (sorry , I can't help then).
> Does the following, simpler code work for you?
> 
> from Tkinter import *
> 
> root = Tk()
> menubar = Menu(root)
> menu = Menu(menubar, tearoff=0)
> menubar.add_cascade(label="File", menu=menu)
> menu.add_command(label="New")
> menu = Menu(menubar, tearoff=0)
> menubar.add_cascade(label="Edit", menu=menu)
> menu.add_command(label="Cut")
> menu.add_command(label="Copy")
> menu.add_command(label="Paste")
> root.config(menu=menubar)
> root.mainloop()
> 
> The only thing that looks a little starnge to me in the
original code is
> that the menubar is created as a child of the AppUi class,
which is basically a Frame,
> but then it is attached to that Frame's parent (the root
window).
> Maybe the mac doesn't like this (just a thought)?
> 
> Michael
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[Tutor] command in menu and button

[Double Six]

Hi all, 

I'm puzzled by the 'command' option in menu and Button of
Tkinter. With the following lines,

menu.add_command(label="Open Viewer", command=os.system("Open my
viewer &"))

Button(toolbar, text='Open Viewer', command=os.system("Open my
viewer &")).pack(side=LEFT) 

I wanted to open a graphical viewer from the prompt (that is why
I used os.system("Open viewer &")) once the user selects the
option from the menu, or clicks the button, but this gets
implements whenever the GUI is launched instead. Why is this?
And how can I make it work?

Many thanks,
Joe



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Re: [Tutor] command in menu and button

[Double Six]

Hi John and Alan,

I got it! Thank you both for explaining this situation. 

Thanks,
Joe




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 On Tue, 22 Nov 2005, [EMAIL PROTECTED]
([EMAIL PROTECTED]) wrote:

> >>I'm puzzled by the 'command' option in menu and Button of
> >>Tkinter. With the following lines,
> 
> The command value needs to be a *reference* to a function.
> 
> That is not the function call itself but a reference to the
function
> that will be \called.
> 
> Let me illustrate the difference:
> 
> def f(): print 'Its me!'
> 
> f()   # prints the message
> 
> g = f   # this assigns a reference to f
> 
> g()  # this now calls that reference, 
> so calling g() is the same as calling f()
> 
> 
> >>menu.add_command(label="Open Viewer", 
>command=os.system("Open my viewer &"))
> 
> Here you assign the result of the os.system() 
> call to command, in fact you want to assign 
> a reference to a call of os.system which will 
> be executed when the menu/button is activated.
> 
> The more straightforward way to do that is to 
> define a short function that calls os.system:
> 
> def callSystem():
>os.system(Mycommand)
> 
> And make the menu/button reference callSystem:
> 
> >>menu.add_command(label="Open Viewer", 
>command=callSystem)
> 
> Notice no parens, just the name of the function.
> 
> Because we can wind up with loads of these little 
> wrapper functions there is a shortcut called lambda.
> With lambda we can avoid defining a new mini function:
> 
> >>menu.add_command(label="Open Viewer", 
>command=lambda : os.system("Open my viewer
&"))
> 
> the thing that follows the lambda is what gets 
> executed when the widget activates.
> 
> Does that help?
> 
> Alan G.
> http://www.freenetpages.co.uk/hp/alan.gauld
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