Use a mask to restrict the input of the qlineedit control

from PyQt5.QtWidgets import *
import sys

class QLineEditMask(QWidget):
    def __init__(self):
        super(QLineEditMask, self).__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle(' Use a mask to limit QLineEdit Control input ')

        ipLineEdit = QLineEdit()
        macLineEdirt = QLineEdit()
        dateLineEdit = QLineEdit()
        licenseLineEdit = QLineEdit()

        ipLineEdit.setInputMask("000:.000:000:000;_")
        macLineEdirt.setInputMask("HH:HH:HH:HH:HH:HH;_")
        dateLineEdit.setInputMask("0000-00-00")
        licenseLineEdit.setInputMask('>AAAA-AAAA-AAAA-AAAA-AAAA;#')

        formLayout = QFormLayout()
        formLayout.addRow(' Digital mask ', ipLineEdit)
        formLayout.addRow('Mac Mask ', macLineEdirt)
        formLayout.addRow(' Date mask ', dateLineEdit)
        formLayout.addRow(' License mask ', licenseLineEdit)

        self.setLayout(formLayout)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    mainWindow = QLineEditMask()
    mainWindow.show()
    sys.exit(app.exec_())