# base class for tk common dialogues## this module provides a base class for accessing the common# dialogues available in Tk 4.2 and newer.  use tkFileDialog,# tkColorChooser, and tkMessageBox to access the individual# dialogs.## written by Fredrik Lundh, May 1997# from Tkinter import * class Dialog:     command  = None     def __init__(self, master=None, **options):         # FIXME: should this be placed on the module level instead?        if TkVersion < 4.2:            raise TclError, "this module requires Tk 4.2 or newer"         self.master  = master        self.options = options        if not master and options.get('parent'):            self.master = options['parent']     def _fixoptions(self):        pass # hook     def _fixresult(self, widget, result):        return result # hook     def show(self, **options):         # update instance options        for k, v in options.items():            self.options[k] = v         self._fixoptions()         # we need a dummy widget to properly process the options        # (at least as long as we use Tkinter 1.63)        w = Frame(self.master)         try:             s = w.tk.call(self.command, *w._options(self.options))             s = self._fixresult(w, s)         finally:             try:                # get rid of the widget                w.destroy()            except:                pass         return s