PyQt5 QCalendarWidget – Getting Effective ID

In this article we will see how we can get the effective ID of the QCalendarWidget, effective id is the window system identifier of the calendar. Effective identifier means the native parent’s window system identifier(ID) of the calendar.
Note 1: It is recommended that you do not store this value as it is likely to change at run-time.

In order to do this we will use effectiveWinId method with the QCalendarWidget object.
Syntax : calendar.effectiveWinId()
Argument : It takes no argument
Return : It return native calendar ID 

Note 2: This method should be called after the opening of the main window i.e outside the main window class
Below is the implementation 

Python3

# 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, 650, 400)

        # calling method
        self.UiComponents()

        # showing all the widgets
        self.show()

    # method for components
    def UiComponents(self):

        # creating a QCalendarWidget object
        self.calendar = QCalendarWidget(self)

        # setting geometry to the calendar
        self.calendar.setGeometry(50, 10, 400, 250)

        # setting cursor
        self.calendar.setCursor(Qt.PointingHandCursor)

        # setting properties
        self.calendar.setProperty("Blocked", 0)

        # setting properties
        self.calendar.setProperty("Highlighted dates : ", 0)

        # creating label to show the properties
        self.label = QLabel(self)

        # setting geometry to the label
        self.label.setGeometry(100, 280, 250, 60)

        # making label multi line
        self.label.setWordWrap(True)



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

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

# getting system identifier of calendar
identifier = window.calendar.effectiveWinId()

# setting this text to the label
window.label.setText("ID : " + str(identifier))

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

Output :