I would to like to control the font of the text on a tkMessageBox but I can't see any reference of such a stuff. Is it only implemented in Tkinter?
Thanks,
You can configure the font for just dialog boxes by doing the following:
from Tkinter import *
import tkMessageBox
r = Tk()
r.option_add('*Dialog.msg.font', 'Helvetica 12')
tkMessageBox.showinfo(message='Hello')
(Only the option_add invocation is modified from the accepted answer.)