python 构建数字时钟

from tkinter import *
from time import strftime
root = Tk()
root.geometry('500x350+300+300')
root.title("时钟")
# 设置文本标签
lb = Label(root, font=("微软雅黑", 50, "bold"), bg='#87CEEB', fg="#B452CD")
lb.pack(anchor="center", fill="both", expand=1)
def showtime():
    string = strftime("%H:%M:%S %p")
    lb.config(text=string)
    # 每隔 1秒钟执行time函数
    lb.after(1000, showtime)
# 调用showtime()函数
showtime()
# 显示窗口
mainloop()