ejemplo de código de información de pyqt qmessagebox

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Ejemplo 1: qmessagebox pyqt5

import sys
from PyQt4.QtGui import*from PyQt4.QtCore import*defwindow():
   app = QApplication(sys.argv)
   w = QWidget()
   b = QPushButton(w)
   b.setText("Show message!")

   b.move(50,50)
   b.clicked.connect(showdialog)
   w.setWindowTitle("PyQt Dialog demo")
   w.show()
   sys.exit(app.exec_())defshowdialog():
   msg = QMessageBox()
   msg.setIcon(QMessageBox.Information)

   msg.setText("This is a message box")
   msg.setInformativeText("This is additional information")
   msg.setWindowTitle("MessageBox demo")
   msg.setDetailedText("The details are as follows:")
   msg.setStandardButtons(QMessageBox.Ok | QMessageBox.Cancel)
   msg.buttonClicked.connect(msgbtn)
	
   retval = msg.exec_()print"value of pressed message box button:", retval
	
defmsgbtn(i):print"Button pressed is:",i.text()if __name__ =='__main__': 
   window()

Ejemplo 2: ejemplo de información de pyqt5 qmessagebox

defopen_database(self, filename=''):""" This function opens a database and set this on the UI """# If not filename provide, then open dialog to selectif self.created:
        QMessageBox.information(self,
                                self.tr("Information"),
                                self.tr("You may only have one database"" open at time."))
        DEBUG("Ya existe una base de datos abierta")returnifnot filename:if self.__last_open_folder isNone:
            directory = os.path.expanduser("~")else:
            directory = self.__last_open_folder
        filter_ = settings.SUPPORTED_FILES.split(';;')[0]
        filename, _ = QFileDialog.getOpenFileName(self,
                                                  self.tr("Open Database"),
                                                  directory,
                                                  filter_)# If is canceled, returnifnot filename:return# Remember the folder
        self.__last_open_folder = file_manager.get_path(filename)
 
    DEBUG("Abriendo la base de datos: ''".format(filename))# If filename providetry:# Read pdb file
        pfile_object = pfile.File(filename)
        db_data = pfile_object.read()# Create a dict to manipulate data more easy
        db_data = self.__sanitize_data(db_data)except Exception as reason:
        QMessageBox.information(self,
                                self.tr("The file couldn't be open"),str(reason))
        CRITICAL("Error al intentar abrir el archivo: ".format(reason))return# Create a database container widget
    db_container = database_container.DatabaseContainer()try:
        db_container.create_database(db_data)except Exception as reason:
        QMessageBox.information(self,
                                self.tr("Error"),str(reason))
        CRITICAL("Error al crear la base de datos: ".format(reason))return# Set the PFile object to the new database
    db_container.pfile = pfile_object
    # Add data base container to stacked
    self.add_widget(db_container)# Database name
    db_name = file_manager.get_basename(filename)# Update title with the new database name, and enable some actions
    pireal = Pireal.get_service("pireal")
    pireal.change_title(db_name)
    pireal.set_enabled_db_actions(True)
    pireal.set_enabled_relation_actions(True)# Add to recent databases
    self.recent_databases = filename
    self.created =True

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