Tkinter reference: A GUI for Python

Higher-level priorities take precedence over lower-level ones.See Standardizing appearance and the option database, below, for an overview of the optiondatabase. The syntax of the pattern argument to .option_add() is the same as theoption-pattern part of the resource specification line.For example, to get the effect of this resource specification line:*Button*font:times 24 boldyour application (self in this example) might include these lines:self.bigFont = tkFont.Font ( family="times", size=24,weight="bold" )self.option_add ( "*Button*font", self.bigFont )Any Button widgets created after executing these lines would default to bold Times 24font (unless overriden by a font option to the Button constructor).w.option_clear()This method removes all options from the Tkinter option database. This has the effect ofgoing back to all the default values.w.option_get ( name, className )Use this method to retrieve the current value of an option from the Tkinter optiondatabase. The first argument is the instance key and the second argument is the classkey. If there are any matches, it returns the value of the option that best matches. If thereare no matches, it returns "".Refer to the section on Standardizing appearance, below, for more on matching keys tooptions.w.option_readfile ( fileName, priority=None )As a convenience for user configuration, you can designate a named file where users canput their preferred options, using the same format as the .Xdefaults file. Then, whenyour application is initializing, you can pass that file’s name to this method, and theoptions from that file will be added to the database. If the file doesn’t exist, or its formatis invalid, this method will raise TclError.Refer to the section on Standardizing appearance, below, for an introduction to the optionsdatabase and the format of option files.w.quit()This method exits the main loop. See .mainloop(), above, for a discussion of mainloops.w.selection_clear()If w currently has a selection (such as a highlighted segment of text in an entry widget),clear that selection.w.selection_get()If w currently has a selection, this method returns the selected text. If there is no selection,it raises TclError.New Mexico Tech Computer Center Tkinter reference: Universal widget methods Page 65