PyQt5 messagebox

In this article you will learn how to create a PyQt5 messagebox:

To show a messagebox we need to import QMessageBox.

Related Course: Python GUI Development with PyQt5

from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QMessageBox

We use the method QMessageBox.question() to display the messagebox.

PyQt5 messagebox code
Copy the code below to display a messagebox.

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QMessageBox
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import pyqtSlot
class App(QWidget):
def __init__(self):
        super().__init__()
        self.title = 'PyQt5 messagebox - pythonspot.com'
        self.left = 10
        self.top = 10
        self.width = 320
        self.height = 200
        self.initUI()
        
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
buttonReply = QMessageBox.question(self, 'PyQt5 message', "Do you like PyQt5?", QMessageBox.Yes | QMessageBox.No, QMessageBox.No)
        if buttonReply == QMessageBox.Yes:
            print('Yes clicked.')
        else:
            print('No clicked.')
self.show()
        
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

More buttons for a messagebox Take into account we use QMessageBox.Yes and QMessageBox.No. We can easily add other options:

buttonReply = QMessageBox.question(self, 'PyQt5 message', "Do you want to save?", QMessageBox.Yes | QMessageBox.No | QMessageBox.Cancel, QMessageBox.Cancel)
        print(int(buttonReply))
        if buttonReply == QMessageBox.Yes:
            print('Yes clicked.')
        if buttonReply == QMessageBox.No:
            print('No clicked.')
        if buttonReply == QMessageBox.Cancel:
            print('Cancel')

The available buttons are:

Overview
QMessageBox.Cancel	QMessageBox.Ok	QMessageBox.Help
QMessageBox.Open	QMessageBox.Save	QMessageBox.SaveAll
QMessageBox.Discard	QMessageBox.Close	QMessageBox.Apply
QMessageBox.Reset	QMessageBox.Yes	QMessageBox.YesToAll
QMessageBox.No	QMessageBox.NoToAll	QMessageBox.NoButton
QMessageBox.RestoreDefaults	QMessageBox.Abort	QMessageBox.Retry
QMessageBox.Ignore

Information, Warning, and Critical popups

PyQt5 has built-in helper methods for everyday alerts. You can show an informational message, a warning message, or an error message:

# Information message
QMessageBox.information(self, "Information", "Your file has been saved successfully.")

# Warning message
QMessageBox.warning(self, "Warning", "Low battery warning.")

# Critical error message
QMessageBox.critical(self, "Error", "Failed to connect to database.")

Each dialog shows a matching system icon (information bubble, warning triangle, or error cross) and an OK button.

Download PyQT5 Examples