我的tkinter学习笔记6

from tkinter import *
import time
root = Tk()
root.title("文字滚动效果")
root.geometry("320x240+100+100")
show_str = StringVar(root)
show_str.set("this")
source_str = "欢迎关注公众号<自学测试之道>，一起体验测试的味道！"
stopflag = True
pos = 0
def marquee(widget):
   textwidth = 20
   strlen = len(source_str)
   global pos
   if strlen - pos < 20:
       show_str.set(source_str[pos:pos+textwidth] + source_str[0:20 - strlen + pos])
   else:
       show_str.set(source_str[pos:pos+textwidth])
   pos += 1
   if pos > strlen:
       pos = 0
   global stopflag
   if stopflag:
       widget.after(300, marquee, widget)

show_lb = Label(root, textvariable=show_str, bg='red', compound='center')
show_lb.place(x=20, y=20, width=200, height=30)

def startmarque():
   global stopflag
   stopflag = True
   marquee(show_lb)

def stopmarquee():
   global stopflag
   stopflag = False

button1 = Button(root, text="开始", command=startmarque)
button2 = Button(root, text="停止", command=stopmarquee)
button1.place(x=20, y=100, width=50, height=30)
button2.place(x=200, y=100, width=50, height=30)
root.mainloop()

import time
import tkinter as tk

class App:
    def __init__(self):
        self.root = tk.Tk()
        self.root.title("获取系统时间")
        self.label = tk.Label(text="")
        self.label.pack()
        self.update_clock()
        self.root.mainloop()

    def update_clock(self):
        now = time.strftime("%Y-%m-%d %H:%M:%S")
        self.label.configure(text = now)
        self.root.after(1000,self.update_clock)

app = App()