怎么用python写窗口程序

from tkinter import *

def btnClick():

    textLabel['text']='我点击了按钮'

root = Tk(className="我的第一个窗口程序");

textLabel = Label(root,text = '提示显示',justify=LEFT,padx=10)

textLabel.pack(side = TOP)

btn = Button(root)

btn['text']='点击测试'

btn['command'] = btnClick

btn.pack(side = BOTTOM)

mainloop()