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How to modify the default font in Tkinter? - Stack Overflow If you want to change a default font, or any named font, you have to access the font object via nametofont (): def_font = tkinter.font.nametofont ("TkDefaultFont") and then config the returned object, like def_font.config (size=24) When you call myfont = tkinter.font.Font (font="TkDefaultFont") Changing Tkinter Label Text Dynamically using Label configure() The Label widget in tkinter is generally used to display text as well as image. Text can be added in a Label widget by using the constructor Label (root, text= "this is my text"). Once the Label widget is defined, you can pack the Label widget using any geometry manager. Update Label Text in Python TkInter - Stack Overflow from Tkinter import Tk, Checkbutton, Label from Tkinter import StringVar, IntVar root = Tk () text = StringVar () text.set ('old') status = IntVar () def change (): if status.get () == 1: # if clicked text...