利用QT写一个极简单的图形化Python闹钟程序
今天我们讲一下用Python写的GUI小程序。一个小闹钟（只是屏幕提示，没有声音哦）
让我们先介绍这个闹钟如何奇葩。
需要通过命令行启动。
没有标题栏。
没菜单。
甚至没有关闭按钮。
没有运行界面。
看到这里想必大家要问了，何必去做一个这样弱爆了的程序呢。显然，教育意义大于其实际用处。
像其他的模块一样，QT界面包是需要加载的。
我们用到了命令行输入，所以，sys模块也是必须的。
用到了时间，但是我们不需要使用time模块，我们用QT提供的QTime模块。
让我们先写import 语句部分。
import sys from PyQt4.QtCore import * from PyQt4.QtGui import * app = QApplication(sys.argv)
这是一个控制qt程序命脉的类，之后我们会慢慢解释。在每一个Qt程序中，都会找到类似的语句。
之后就是输入闹钟时间了。上程序。
try:
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]"
其中包含了异常处理，对于一个应用程序，我们应该将所有的异常情况都考虑进去。
程序中使用raise 来触发异常。迫使程序进入我们的预想轨道。
显然，上面的程序是不够的，它并没有时间判断和GUI部分。
如何判断时间是否到了呢，我们给出一个不是特别准确的方法，定时判断。
import time while QTime.currentTime() < due: #休眠20秒 time.sleep(20)
当时间到了我们就会跳到下一步，创建一个窗体，延迟60s 后关闭。
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_()
看来，我们又需要写一个关于 QTime模块的介绍了。
现在把所有的句子放在一起。让我们测试下。
附完整代码：
import sys
import time
from PyQt4.QtCore import *
from PyQt4.QtGui import *
app = QApplication(sys.argv)
try:
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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