Hex Colour Generator (with test)

from random import choice ## random is a module and choice is a function
from tkinter import*

hex_chars = ['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'] ## create the list of characters from which to choose
colour_code = '#' ## this is the start of any colour code in python

for i in range (0,6):
    colour_code = colour_code + choice(hex_chars)

print ('The hexadecimal colour code generated is:' ,colour_code)


my_window =Tk() ##function in tkinder that opens a window
my_canvas = Canvas (my_window,width=200,height=200,background= colour_code) ## the window's size and color is defined here
my_canvas.grid(row=0,column=0)
my_window.mainloop()