PyQt5 - Lesson 001. QLineEdit IP Address

ip address, ip адрес, lineedit, qlineedit, QLineEdit example, QLineEdit IP Address, pyqt5, pycharm

Available articles on Qt/С++ and Qt/QML

When developing network applications may need to create molds for input ip-address, but the use of a simple method setInputMask ( "000.000.000.000; _"); According to the argument for QLineEdit does not provide the proper result as the mask allows you to enter the values of 999, 657, etc., while the IP-address of the limited number of 255.

One way to solve this problem is to use Validator.

This lesson has been implemented in the Qt / C ++, and now the same thing to realize PyQt5/Python.

Project structure

The project will consist of only one file:

1. main .py

main .py

from PyQt5 import QtWidgets
from PyQt5.QtWidgets import QMainWindow, QLabel, QGridLayout, QWidget, QLineEdit
from PyQt5.QtCore import QSize, QRegExp
from PyQt5.QtGui import QRegExpValidator
 
 
class MainWindow(QMainWindow):
 
    def __init__(self):
        QMainWindow.__init__(self)
 
        self.setMinimumSize(QSize(480, 80))         # Set sizes 
        self.setWindowTitle("Line Edit IP Address") # Set the window title
        central_widget = QWidget(self)              # Create a central widget
        self.setCentralWidget(central_widget)       # Install the central widget
 
        grid_layout = QGridLayout(self)         # Create QGridLayout
        central_widget.setLayout(grid_layout)   # Set this accommodation in central widget
 
        grid_layout.addWidget(QLabel("Введите IP-адрес", self), 0, 0)
 
        ipRange = "(?:[0-1]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])"   # Part of the regular expression
        # Regulare expression
        ipRegex = QRegExp("^" + ipRange + "\\." + ipRange + "\\." + ipRange + "\\." + ipRange + "$")
        ipValidator = QRegExpValidator(ipRegex, self)   
 
        lineEdit = QLineEdit()
        lineEdit.setValidator(ipValidator)      
        grid_layout.addWidget(lineEdit, 0, 1)
 
 
if __name__ == "__main__":
    import sys
 
    app = QtWidgets.QApplication(sys.argv)
    mw = MainWindow()
    mw.show()
    sys.exit(app.exec())

Result

The following result is obtained with the possibility validation window IP-address.

Link to repository