python——时钟（作者本人已测试，可运行，无bug）

import tkinter
import threading
import datetime
import time
app=tkinter.Tk()
app.overrideredirect(True)
app.attributes('-alpha',0.9)
app.attributes('-topmost',1)

app.geometry('200x100+100+100')
labelDateTime=tkinter.Label(app)
labelDateTime.pack(fill=tkinter.BOTH,expand=tkinter.YES)
labelDateTime.configure(bg='red')
labelDateTime.font=('黑体',46)
X=tkinter.IntVar(value=0)
Y=tkinter.IntVar(value=0)
canMove=tkinter.IntVar(value=0)
still=tkinter.IntVar(value=1)

def onLeftButtonDown(event):
    app.attributes('-alpha',0.4)
    X.set(event.x)
    Y.set(event.y)
    canMove.set(1)
labelDateTime.bind('<Button-1>',onLeftButtonDown)


def onLeftButtonUp(event):
    app.attributes('-alpha',0.9)
    canMove.set(0)
labelDateTime.bind('<ButtonRelease-1>',onLeftButtonUp)
        

def onLeftButtonMove(event):
    if canMove.get()==0:
        return
    newX=app.winfo_x()+(event.x-X.get())
    newY=app.winfo_y()+(event.y-Y.get())
    g='110x25+'+str(newX)+'+'+str(newY)
    app.geometry(g)
labelDateTime.bind('<B1-Motion>',onLeftButtonMove)


def onRightButtonDown(event):
    still.set(0)
    t.join(0.2)
    app.destroy()
labelDateTime.bind('<Button-3>',onRightButtonDown)

def nowDateTime():
    while still.get()==1:
        now=datetime.datetime.now()
        s=str(now.year)+'-'+str(now.month)+':'+str(now.day)+' '
        s=s+str(now.hour)+':'+str(now.minute)+':'+str(now.second)
        labelDateTime['text']=s
        labelDateTime.font=('黑体',46)
        time.sleep (0.2)
t=threading.Thread(target=nowDateTime)
t.daemon=True
t.start()

app.mainloop()