tkinter 怎么设置滚动条

正在学习tkinter，可以试试看这个：
import tkinter as tk


window = tk.Tk()
window.title('my window')
window.geometry('200x200')


l = tk.Label(window, bg='yellow', width=20, text='empty')
l.pack()


def print_selection(v):
    l.config(text='you have selected ' + v)


s = tk.Scale(window, label='try me', from_=6, to=12, orient=tk.HORIZONTAL,
             length=200, showvalue=0, tickinterval=2, resolution=0.01,
             command=print_selection)
s.pack()


window.mainloop()