How can I get the width of a string in Python?

[heiner55]

Width with tkinter:

#!/usr/bin/python3
import tkinter
import tkinter.font
app = tkinter.Frame()

def width_and_height_calculator_in_pixel(txt, fontname, fontsize):
    font  = tkinter.font.Font(family=fontname, size=fontsize)
    return (font.measure(txt), font.metrics('linespace'))

print( width_and_height_calculator_in_pixel("Hello World", "Calibri", 11) )
print( width_and_height_calculator_in_pixel("Hello World", "Calibri", 14) )
print( width_and_height_calculator_in_pixel("Hello World", "Calibri", 24) )
print()
print( width_and_height_calculator_in_pixel("Hello World", "Helvetica", 11) )
print( width_and_height_calculator_in_pixel("Hello World", "Helvetica", 14) )
print( width_and_height_calculator_in_pixel("Hello World", "Helvetica", 24) )

Output:
(70, 16)
(91, 20)
(155, 34)

(73, 16)
(97, 21)
(168, 35)