Python PyQt5: How to show an error message with PyQt5

Question

In normal Python (3.x) we always use showerror() from the tkinter module to display an error message but what should I do in PyQt5 to display exactly the same message type as well?

score 36 · Answer 1 · edited May 05 '20 at 13:28

36

Don't forget to call .exec_() to display the error:

from PyQt5.QtWidgets import QMessageBox

msg = QMessageBox()
msg.setIcon(QMessageBox.Critical)
msg.setText("Error")
msg.setInformativeText('More information')
msg.setWindowTitle("Error")
msg.exec_()

edited May 05 '20 at 13:28

djvg

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answered Jan 08 '19 at 15:02

NShiell

481
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Thanks for the `.exec_()` hint! – dmitry_romanov Sep 15 '19 at 19:04
Quick and easy solution, thanks. – ArduinoBen Apr 16 '22 at 16:02

score 31 · Accepted Answer · answered Oct 24 '16 at 20:43

Qt includes an error-message specific dialog class QErrorMessage which you should use to ensure your dialog matches system standards. To show the dialog just create a dialog object, then call .showMessage(). For example:

error_dialog = QtWidgets.QErrorMessage()
error_dialog.showMessage('Oh no!')

Here is a minimal working example script:

import PyQt5
from PyQt5 import QtWidgets

app = QtWidgets.QApplication([])

error_dialog = QtWidgets.QErrorMessage()
error_dialog.showMessage('Oh no!')

app.exec_()

score 6 · Answer 3 · answered Apr 17 '19 at 12:45

6

To show a message box, you can call this def:

from PyQt5.QtWidgets import QMessageBox, QWidget

MainClass(QWidget):
    def __init__(self):
        super().__init__()

    def clickMethod(self):
        QMessageBox.about(self, "Title", "Message")

answered Apr 17 '19 at 12:45

Karam Qusai

635
12
13

score 5 · Answer 4 · answered Nov 13 '17 at 23:13

All above options didn't work for me using Komodo Edit 11.0. Just had returned "1" or if not implemented "-1073741819".

Usefull for me was: Vanloc's solution.

def my_exception_hook(exctype, value, traceback):
    # Print the error and traceback
    print(exctype, value, traceback)
    # Call the normal Exception hook after
    sys._excepthook(exctype, value, traceback)
    sys.exit(1)

# Back up the reference to the exceptionhook
sys._excepthook = sys.excepthook

# Set the exception hook to our wrapping function
sys.excepthook = my_exception_hook

score 4 · Answer 5 · edited Oct 25 '16 at 17:35

4

The following should work:

msg = QMessageBox()
msg.setIcon(QMessageBox.Critical)
msg.setText("Error")
msg.setInformativeText(e)
msg.setWindowTitle("Error")

It is not the exact same message type (different GUI's) but fairly close. e is the expression for an Error in python3

Hope that helped, Narusan

edited Oct 25 '16 at 17:35

ekhumoro

107,367
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answered Oct 24 '16 at 20:38

Narusan

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4
17

Instead of msg.setIcon(QMessageBox.critical) you should write a number as parameter. See: http://doc.qt.io/qt-5/qmessagebox.html#Icon-enum – Ramón Wilhelm Oct 25 '16 at 16:07
@AlanHorman. No, it's just a typo - should be `QMessageBox.Critical` (i.e. upper case "C"). – ekhumoro Oct 25 '16 at 17:37
Sorry about that typo, I should've double checked the spelling – Narusan Oct 25 '16 at 19:13

score 4 · Answer 6 · answered Feb 25 '20 at 11:20

4

Assuming you are in a QWidget from which you want to display an error message, you can simply use QMessageBox.critical(self, "Title", "Message"), replace self by another (main widget for example) if you are not is a QWidget class.

answered Feb 25 '20 at 11:20

gluttony

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Python PyQt5: How to show an error message with PyQt5

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