confused about classes and tkinter object design

[marc wyburn]

Hi,

I've created my first Tkinter GUI class which consists of some buttons
that trigger functions.  I have also created a
tkFileDialog.askdirectory control to local a root folder for log
files.

I have several file paths that depend on the value of
tkFileDialog.askdirectory should I create an object that inherits this
value or can I point functions at the GUI class?

I am creating the tkinter GUI instance using;

if __name__ == "__main__":
    GUI = AuditorGUI()
    GUI.mainloop()

class AuditorGUI(Frame):
    def __init__(self):
        Frame.__init__(self)
        self.pack(expand = YES, fill = BOTH)

##      Create GUI objects

        self.currentdir = StringVar()
        self.currentdir.set(os.getcwd())

        self.logdir = Button(self, text="Choose Data
directory",command=self.choose_dir)
        self.logdir.grid(row=1,column=0,sticky='nsew',pady=20,padx=20)

        self.labeldirpath = Label(self, textvariable=self.currentdir)

    def choose_dir(self):
        dirname = tkFileDialog.askdirectory
(parent=self,initialdir=self.currentdir.get(),title='Please select a
directory')
        if len(dirname ) > 0:
            self.currentdir.set(dirname)

I think I have created an instance of the AuditorGUI class called GUI
so should be able to access the path using GUI.currentdir but this
doesn't work.

I'm still struggling with classes so not sure whether my problem is
tkinter related or not.

Thanks, MW