Underline Text in Tkinter Label widget?

Question

I am working on a project that requires me to underline some text in a Tkinter Label widget. I know that the underline method can be used, but I can only seem to get it to underline 1 character of the widget, based on the argument. i.e.

p = Label(root, text=" Test Label", bg='blue', fg='white', underline=0)

change underline to 0, and it underlines the first character, 1 the second etc

I need to be able to underline all the text in the widget, I'm sure this is possible, but how?

I am using Python 2.6 on Windows 7.

Answer 1

To underline all the text in a label widget you'll need to create a new font that has the underline attribute set to True. Here's an example:

import Tkinter as tk
import tkFont

class App:
    def __init__(self):
        self.root = tk.Tk()
        self.count = 0
        l = tk.Label(text="Hello, world")
        l.pack()
        # clone the font, set the underline attribute,
        # and assign it to our widget
        f = tkFont.Font(l, l.cget("font"))
        f.configure(underline = True)
        l.configure(font=f)
        self.root.mainloop()


if __name__ == "__main__":
    app=App()

Answer 2

For those working on Python 3 and can't get the underline to work, here's example code to make it work.

from tkinter import font

# Create the text within a frame
pref = Label(checkFrame, text = "Select Preferences")
# Pack or use grid to place the frame
pref.grid(row = 0, sticky = W)
# font.Font instead of tkFont.Fon
f = font.Font(pref, pref.cget("font"))
f.configure(underline=True)
pref.configure(font=f)