Newbie scoping problem

[David Miller]

I'm trying to put together a fairly simple Tkinter application.
In a nutshell, I want to have a root window with a scrollbox of
"selected" files, and N "browser" windows displaying files in 
different directories.  Double clicking on an entry in one of the
browser windows should insert it in the root window scrollbox.

Here's the code attached to the "New Browser" button:

    def browsewin(self):
        new = Toplevel()                    # replace current box
        new.title('Testing new win')          # new resizable window
        new.iconname("Miller_time")
        Label(new,  text='The Ultimate Browser').pack(side=TOP)
        list   = Listbox(new)
        scroll = Scrollbar(new)
        list.config(yscrollcommand=scroll.set, relief=SUNKEN, height=20, width=40)
        list.pack(side=LEFT, expand=YES, fill=BOTH)
        scroll.config(command=list.yview, relief=SUNKEN)
        scroll.pack(side=RIGHT, fill=BOTH)
        pos = 0
        retcode = os.system("ls /etc > /tmp/ls")
        for label in open("/tmp/ls", "r").readlines():    # Grab some text 
            list.insert(pos, label[:-1])                  # and menu/toolbars
            pos = pos + 1
        list.config(selectmode=SINGLE, setgrid=1)         # select,resize modes
        list.bind('<Double-1>', self.handleList)          # set event handler
        self.listbox = list


And the handleList method is pretty simple:

    def handleList(self, event):
        index = self.listbox.curselection()           # on listbox double-click
        label = self.listbox.get(index)               # fetch selection text
        print index, label                            # and call action here

The problem:

This seems to work fine - I can create a new browser, double-click away
and pop text into the root scrollbox (listbox + scrollbar).  Create a 
new browser and do the same thing.  The problem comes when going back to
an early browser window, where the following happens:

Exception in Tkinter callback
Traceback (innermost last):
  File "/usr/local/lib/python1.5/lib-tk/Tkinter.py", line 752, in __call__
    return apply(self.func, args)
  File "./sched.py", line 91, in handleList
    label = self.listbox.get(index)               # fetch selection text
  File "/usr/local/lib/python1.5/lib-tk/Tkinter.py", line 1364, in get
    return self.tk.call(self._w, 'get', first)
TclError: bad listbox index "": must be active, anchor, end, @x,y, or a number


I assume this means that self.listbox.curselection() can only
reference the most recently created listbox (browser) because I'm 
assigning that handle when creating it.

So how do I reference the other browser windows I've created?

Thanks!

--- David Miller

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