PyQt5 – Tri-state Check Box

When we create a check box, by default there are two state which are either checked i.e True and other is False. But we can add third state to it which is neither True or False with the help of setTristate method.

Below is how all three states looks like.

Syntax : checkbox.setTristate(True)

Argument : It takes bool as argument.

Action performed : It will add third state to the check box.

Below is the implementation.

# importing libraries
from PyQt5.QtWidgets import *
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import sys


class Window(QMainWindow):

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

        # setting title
        self.setWindowTitle("Python ")

        # setting geometry
        self.setGeometry(100, 100, 600, 400)

        # calling method
        self.UiComponents()

        # showing all the widgets
        self.show()

    # method for widgets
    def UiComponents(self):

        # creating the check-box
        checkbox = QCheckBox('Check Box', self)

        # setting geometry of check box
        checkbox.setGeometry(200, 150, 100, 30)

        # creating the third state
        checkbox.setTristate(True)


# create pyqt5 app
App = QApplication(sys.argv)

# create the instance of our Window
window = Window()

# start the app
sys.exit(App.exec())

Output :