Display standard output in Tk widget

As Ashish commented, just use a Label and tie it to a StringVar variable:

class Application(Frame):    def __init__(self, master):        Frame.__init__(self, master)        self.grid()        self.create_widgets()# The class below will house the buttons and boxes     def create_widgets(self):        self.button1 = Button(self, text = "Four Sided Dice", command=self.dice4)        self.button1.grid()        self.button2 = Button(self, text = "Six Sided Dice", command=self.dice6)        self.button2.grid()        self.button3 = Button(self, text = "Twelve Sided Dice", command=self.dice12)        self.button3.grid()        self.label_var = StringVar()        self.label1 = Label(self, textvariable=self.label_var)        self.label1.grid()    # The bellow classes define the commands to use the random function    def dice4(self):        fourside = random.randint(1,4)        self.label_var.set("You Rolled a " + str(fourside) + " using a four sided dice")    def dice6(self):        sixside = random.randint(1,6)        self.label_var.set("You Rolled a " + str(sixside) + " using a six sided dice")    def dice12(self):        twelveside = random.randint(1,12)        self.label_var.set("You Rolled a " + str(twelveside) + " using a twelve sided dice")app = Application(diceroll)diceroll.mainloop()

Note: I made the dice functions methods of the Application class.