原例用的是PyQt4，源码如下：
import sys
import time
from PyQt4.QtCore import *
from PyQt4.QtGui import *
app = QApplication(sys.argv)
try:
due = QTime.currentTime()
message = "Alert!"
if len(sys.argv) < 2:
raise ValueError
hours, mins = sys.argv[1].split(":")
due = QTime(int(hours), int(mins))
if not due.isValid():
raise ValueError
if len(sys.argv) > 2:
message = " ".join(sys.argv[2:])
except ValueError:
message = "Usage: alert.pyw HH:MM [optional message]" # 24hr clock
while QTime.currentTime() < due:
time.sleep(20) # 20 seconds
label = QLabel("<font color=red size=72><b>" + message + "</b></font>")
label.setWindowFlags(Qt.SplashScreen)
label.show()
QTimer.singleShot(60000, app.quit) # 1 minute
app.exec_()
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如果用PyQt5，在原码的基础上，将from PyQt4.QtCore import * 改成from PyQt5.QtCore import *，from PyQt5.QtGui import *，程序是无法正确运行的。运行之后，没有任何反应。原因在于，QApplication 已经定位到PyQt5.QtWidgets这个模块了。所以，要加入from PyQt5.QtWidgets import *。完整的代码为：
import sys
import time
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
app = QApplication(sys.argv)
try:
due = QTime.currentTime()
message = "Alert!"
if len(sys.argv) < 2:
raise ValueError
hours,mins = sys.argv[1].split(":")
due = QTime(int(hours),int(mins))
if not due.isValid():
raise ValueError
if len(sys.argv) > 2:
message = " ".join(sys.argv[2:])
except ValueError:
message = "Usage:alert.pyw HH:MM [optional message]"
while QTime.currentTime() < due:
time.sleep(20)
label = QLabel("<font color=red size=72><b>" + message + "</b></font>")
label.setWindowFlags(Qt.SplashScreen)
label.show()
QTimer.singleShot(60000,app.quit)
app.exec_()
