Schaltflächen in tkinter sind nicht sichtbar ⇐ Python

[Anonymous]

Code: Select all

import tkinter,time

canvas=tkinter.Canvas(width=500,height=500,bg="white")
canvas.pack()

canvas.create_text(250,250,text="0:0:0",font="Arial 70 bold")

global b

def cl_e():
b=False

def cl_s():
h=0
m=0
s=0
while b:
if s