return from the GUI?

[jtorppa]

I'm a very beginner in using Tkinter, so this is fortunately an easy question to most: how do I return values from GUI created with Tkinter?
I have lots of input data given in the GUI, but I don't know how I can close the root window and return the given parameters to the main Python code to go on with the routine.

[dwblas]

I use a class. You could also have the GUI run the second progam and pass the variables to the program/function. This is an ugly example that was sitting on my computer.

import Tkinter

class EntryTest:
   """ shows using the same StringVar in the second list box
       and in the entry box
   """
   def __init__(self):
      self.top = Tkinter.Tk()
      self.top.title("Test of Entry")
      self.top.geometry("200x125+10+10")

      self.str_1 = Tkinter.StringVar()
      label_lit = Tkinter.StringVar()

      label_1 = Tkinter.Label(self.top, textvariable = label_lit )
      label_1.pack()
      label_lit.set( "Test of Label")

      label_2 = Tkinter.Label(self.top, textvariable = self.str_1 )
      label_2.pack()

      entry_1 = Tkinter.Entry(self.top, textvariable=self.str_1)
      entry_1.pack()
      self.str_1.set( "Entry Initial Value" )

      ##---  Delete the contents of an entry widget
      ## entry.delete(0,END)

      print_button = Tkinter.Button(self.top, text='PRINT CONTENTS',
                     command=self.getit, bg='blue', fg='white' )
      print_button.pack(fill=Tkinter.X, expand=1)

      exit_button= Tkinter.Button(self.top, text='EXIT',
                   command=self.top.quit, bg='red', fg='white' )
      exit_button.pack(fill=Tkinter.X, expand=1)

      entry_1.focus_set()
      self.top.mainloop()

   ##-----------------------------------------------------------------
   def getit(self) :
      print "getit: variable passed =", self.str_1.get()


##===============================================================
if "__main__" == __name__  :
   ET=EntryTest()
   print "\n Under __main__ =", ET.str_1.get()