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#QMessageBox#QColorDialog#QFileDialog#QFontDialog#QInputDialogimport sysfrom PyQt5.QtWidgets import *from PyQt5.QtCore import *from PyQt5.QtGui import *class QDialogDemo(QMainWindow):    def __init__(self):        super(QDialogDemo,self).__init__()        self.initUI()    def initUI(self):        self.setWindowTitle("QDialog案例")        self.resize(300,200)        self.button = QPushButton('弹出对话框',self)        self.button.move(50,50)        self.button.clicked.connect(self.showDialog)    def showDialog(self):        dialog = QDialog()        button = QPushButton('确定',dialog)        button.clicked.connect(dialog.close)        button.move(50,50)        dialog.setWindowTitle('对话框')        #模态显示        dialog.setWindowModality(Qt.ApplicationModal)        #显示        dialog.exec()if __name__ == '__main__':    app =QApplication(sys.argv)    main = QDialogDemo()    main.show()    app.exit(app.exec_())

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