Python PyQt button click example

Python PyQt Connecting Signals to Slots: Exercise-6 with Solution

Write a Python program that creates a button and when clicked it prints a message. Use the PyQt module.

From doc.qt.io:

QApplication Class: The QApplication class manages the GUI application's control flow and main settings.

QWidget Class: The QWidget class is the base class of all user interface objects.

QPushButton Class: The QPushButton widget provides a command button.

QVBoxLayout Class: The QVBoxLayout class lines up widgets vertically.

Sample Solution:

Python Code:

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QVBoxLayout
from PyQt5.QtCore import pyqtSignal

class CustomWidget(QWidget):
    # Define a custom signal
    button_clicked = pyqtSignal()

    def __init__(self):

        layout = QVBoxLayout()

        # Create a custom button
        self.custom_button = QPushButton("Custom Button", self)

        # Connect the button's clicked signal to the custom signal


def custom_slot():
    print("The custom button is clicked.")

def main():
    app = QApplication(sys.argv)
    window = CustomWidget()
    window.setWindowTitle("Custom Widget Example")
    window.setGeometry(100, 100, 400, 200)  # (x, y, width, height)
    # Connect the custom signal to the custom slot

if __name__ == "__main__":


In the exercise above -

  • Import the necessary modules from PyQt5.
  • Create a custom "QWidget" class named "CustomWidget" that inherits from "QWidget". Inside this class, we define a custom signal called "button_clicked".
  • Design a custom button called self.custom_button and connect its clicked signal to the custom ‘button_clicked’ signal.
  • Define a custom slot function called "custom_slot()" that reacts to button presses. In this case, it prints a message when the button is clicked.
  • In the main function, we create the PyQt application, instantiate the "CustomWidget" class, set the window properties, and display the main window.


The custom button is clicked.
The custom button is clicked.
The custom button is clicked.

PyQt: Python PyQt button click example. Part-1


Flowchart: Python PyQt button click example.
Flowchart: Python PyQt button click example.

Python Code Editor:

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