PyQt5 – QScrollBar

QScrollBar is a control that enables the user to access parts of a document that is larger than the widget used to display it. It provides a visual indication of the user’s current position within the document and the amount of the document that is visible. Scroll bars are usually equipped with other controls that enable more accurate navigation. Qt displays scroll bars in a way that is appropriate for each platform.
Below is how the scroll bar looks like 

Example
We will create a window in which we will create a QScrollBar and QLabel widget and every time the value of scroll bar changes it will get displayed in the label
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, 500, 400)

        # calling method
        self.UiComponents()

        # showing all the widgets
        self.show()



    # method for components
    def UiComponents(self):

        scroll = QScrollBar(self)

        # setting geometry of the scroll bar
        scroll.setGeometry(100, 50, 30, 200)

        # making its background color to green
        scroll.setStyleSheet("background : lightgrey;")

        # creating a label
        label = QLabel("GeeksforGeeks", self)

        # setting geometry to the label
        label.setGeometry(200, 100, 300, 80)

        # making label multi line
        label.setWordWrap(True)

        # adding action to the scroll bar
        scroll.valueChanged.connect(lambda: do_action())

        # creating a action method
        def do_action():

            # getting current value of scroll bar
            value = scroll.value()

            # setting text to the label
            label.setText("Current Value : " + str(value))







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

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

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

Output :