Checkbuttons demonstration: set font，,from Tkinter

Checkbuttons demonstration: set font，,from Tkinter

from Tkinter import *class CheckFont( Frame ):   def __init__( self ):      Frame.__init__( self )      self.pack( expand = YES, fill = BOTH )      self.master.title( 'Checkbutton Demo' )         self.frame1 = Frame( self )      self.frame1.pack()      self.text = Entry( self.frame1, width = 40,         font = 'Arial 10' )      self.text.insert( INSERT, 'font style' )      self.text.pack( padx = 5, pady = 5 )      self.frame2 = Frame( self )      self.frame2.pack()      # create boolean variable      self.italicOn = BooleanVar()      # create 'Italic' checkbutton      self.checkItalic = Checkbutton( self.frame2,          text = 'Italic', variable = self.italicOn,          command = self.changeFont )      self.checkItalic.pack( side = LEFT, padx = 5, pady = 5 )   def changeFont( self ):      desiredFont = 'Arial 10'      if self.italicOn.get():         desiredFont += ' italic'      self.text.config( font = desiredFont )def main():   CheckFont().mainloop()if __name__ == '__main__':   main()