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'''关于对话框错误对话框警告对话框提问对话框消息对话框'''import sysfrom PyQt5.QtWidgets import *from PyQt5.QtCore import *from PyQt5.QtGui import *class QMessageboxDemo(QWidget):    def __init__(self):        super(QMessageboxDemo,self).__init__()        self.initUI()    def initUI(self):        self.setWindowTitle("QMessageBox案例")        self.resize(300,400)        layout = QVBoxLayout()        self.button1 = QPushButton('显示关于对话框')        self.button1.clicked.connect(self.showdialog)        #显示消息对话框        self.button2 = QPushButton('显示消息对话框')        self.button2.clicked.connect(self.showdialog)        #警告        self.button3 = QPushButton('显示警告对话框')        self.button3.clicked.connect(self.showdialog)        #错误对话框        self.button4 = QPushButton('显示错误对话框')        self.button4.clicked.connect(self.showdialog)        #提问对话框        self.button5 = QPushButton('显示提问对话框')        self.button5.clicked.connect(self.showdialog)        layout.addWidget(self.button1)        layout.addWidget(self.button2)        layout.addWidget(self.button3)        layout.addWidget(self.button4)        layout.addWidget(self.button5)        self.setLayout(layout)    def showdialog(self):        text = self.sender().text()        if text == '显示关于对话框':            #QMessageBox.about(self,'标题','内容')            QMessageBox.about(self,'关于','这是一个关于对话框')        elif text == '显示消息对话框':            reply = QMessageBox.information(self,'消息','这是一个消息对话框',            QMessageBox.Yes | QMessageBox.No,QMessageBox.Yes)            print(reply)        elif text == '显示警告对话框':            QMessageBox.warning(self,'警告','这是警告对话框', QMessageBox.Yes | QMessageBox.No,QMessageBox.Yes)        elif text == '显示错误对话框':            QMessageBox.critical(self, '错误', '这是错误对话框', QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)        elif text == '显示提问对话框':            QMessageBox.critical(self, '提示', '这是提示对话框', QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)if __name__ == '__main__':    app =QApplication(sys.argv)    main = QMessageboxDemo()    main.show()    app.exit(app.exec_())

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