PyQt comes with a slider, QSlider. You can use this slider to select a value. A slider can be a great input widget for volume.

It allows a user to quickly change the value on a widget range, in contrast to a numeric counter. The range of a QSlider is from 0 to 100, where 100 is 100%.

Related Course: Create GUI Apps with Python PyQt5

QSlider

Create a slider

A slider can be horizontal or vertical. You can choose a type, when creating a slider. Either Qt.Horizontal or Qt.Vertical.

First import QSlider and Qt.

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from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QSlider

Then create a slider:

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mySlider = QSlider(Qt.Horizontal, self)

Then set its geometry (position and size):

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mySlider.setGeometry(30, 40, 200, 30)

And connect a method that’s called when changing its value:

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mySlider.valueChanged[int].connect(self.changeValue)

slider pyqt

Example

The program below creates an empty window with a horizontal slider. If you want a vertical slider, don’t forget to change the geometry.

Copy and paste the code below to try a slider:

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import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QSlider
from PyQt5.QtCore import Qt

class Example(QMainWindow):

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

        mySlider = QSlider(Qt.Horizontal, self)
        mySlider.setGeometry(30, 40, 200, 30)
        mySlider.valueChanged[int].connect(self.changeValue)

        self.setGeometry(50,50,320,200)
        self.setWindowTitle("Checkbox Example")
        self.show()

    def changeValue(self, value):
        print(value)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())

If you are new to Python PyQt, then I highly recommend this book.

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