pyhton界面程序入门（下班倒计时程序）

小白学习Python入门，先摸鱼做一个下班倒计时窗口程序

import tkinter as tk
import datetime as dt
import time
class Application(tk.Tk):
    def __init__(self):
        super().__init__()
        #边框大小
        self.geometry("240x120+300+300")
        self.title('下班倒计时！')
        #两个标签横向排列
        self.lbl_now_time=tk.Label(self,text='')
        self.lbl_now_time.grid(row=0,column=0)
        self.lbl_off_time=tk.Label(self,text='')
        self.lbl_off_time.grid(row=1,column=0)
        self.after(1000,self.refresh_data)
        self.mainloop()
    def refresh_data(self):
        now_time = time.strftime('%Y:%m:%d %H:%M:%S',time.localtime(time.time()))
        now_date = time.strftime('%Y:%m:%d',time.localtime(time.time()))
        off_time = now_date+' 17:30:00'
        #时间字符串转成时间数组
        off_time=time.strptime(off_time,'%Y:%m:%d %H:%M:%S')
        now_time=time.strptime(now_time,'%Y:%m:%d %H:%M:%S')
        #时间数组转成时间戳
        off_time=int(time.mktime(off_time))
        now_time=int(time.mktime(now_time))
        #计算出时间差
        delta=off_time-now_time
        #时间戳转换成时分秒，并显示两位数
        d_h='{:0=2}'.format(int(delta/60/60))
        d_m='{:0=2}'.format(int((delta-int(d_h)*60*60)/60))
        d_s='{:0=2}'.format(delta%60)
        delta_txt=d_h+':'+d_m+':'+d_s
        now_time_txt=time.strftime('%H:%M:%S',time.localtime(time.time()))
        self.lbl_now_time = tk.Label(self,text='当前时间：'+now_time_txt,font=24)
        self.lbl_now_time.grid(row=0,column=0,padx=10,pady=10)
        self.lbl_off_time = tk.Label(self,text='剩余时间：'+delta_txt,font=24)
        self.lbl_off_time.grid(row=1,column=0,padx=10,pady=10)
        #每隔一秒刷新一次
        self.after(1000,self.refresh_data)  

if __name__=='__main__':
    Application=Application()