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import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton
from PyQt5.QtCore import QCoreApplication
class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()


    def initUI(self):
        quit = QPushButton('退出', self)
        quit.clicked.connect(QCoreApplication.instance().quit)
        quit.move(50, 50)
        

        self.setGeometry(300, 300, 250, 150)
        self.setWindowTitle('关闭窗口')
        self.show()
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit((app.exec_()))

转载请注明作者与出处：http://blog.csdn.net/u013511642  王小涛_同學