PyQt5--CustomizeSignal

 # -*- coding:utf-8 -*-
 '''
 Created on Sep 14, 2018

 @author: SaShuangYiBing

 Comment: This example is show how to triggered the customize signal.
 创建了一个名为closeApp的信号。这个信号会在按下鼠标时触发，它连接着QMainWindow的close()插槽
 '''
 import sys
 from PyQt5.QtCore import pyqtSignal,QObject
 from PyQt5.QtWidgets import QApplication,QMainWindow

 class Communicate(QObject):
     closeApp = pyqtSignal() # 信号closeApp是Communicate的类属性，它由pyqtSignal()创建。

 class New_test(QMainWindow):
     def __init__(self):
         super().__init__()
         self.initUI()

     def initUI(self):
         self.c = Communicate()
         self.c.closeApp.connect(self.close) # 自定义closeApp信号连接到QMainWindow的close槽

         self.setGeometry(300,300,250,150)
         self.setWindowTitle('Emit Signal')
         self.show()

     def mousePressEvent(self,event):
         self.c.closeApp.emit() # 当在窗体上点击鼠标时会触发closeApp信号，使程序退出

 if __name__ == '__main__':
     app = QApplication(sys.argv)
     ex = New_test()
     sys.exit(app.exec_())

当程序运行后，在窗口中点击鼠标键时该窗口就会自动退出