How to restrict user input in QLineEdit in pyqt

Question

I have a QLineEdit and i want to restrict QLineEdit to accept only integers. It should work like inputmask. But I dont want to use inputmask, because if user clicks on QLineEdit cursor will be at the position where mouse was clicked. and user need to navigate to 0 position and type what eve he wants.

Is there any alternate for this.

Answer 1

you can use QValidator it works like:

#To allow only int
self.onlyInt = QIntValidator()
self.LineEdit.setValidator(self.onlyInt)

Answer 2

you can use exception handling for validating this:

number = self.ui.number_lineEdit.text()
try:
    number = int(number)
except Exception:
    QtGui.QMessageBox.about(self, 'Error','Input can only be a number')
    pass

you can also use validators to validate input strings.