Python PyQt Find Factorial

By | September 20, 2023

Python PyQt Find Factorial – To create a PyQt GUI program that calculates the factorial of a number, you can use a similar approach as in the previous example. Here’s a basic PyQt program to calculate the factorial of a number entered by the user:

Python PyQt Find Factorial

Python PyQt Find Factorial

Source Code

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QLabel, QLineEdit, QPushButton

class FactorialCalculator(QWidget):
    def __init__(self):

    def initUI(self):
        self.setWindowTitle('Factorial Calculator')
        self.setGeometry(100, 100, 300, 150)

        # Create a vertical layout
        layout = QVBoxLayout()

        # Create input field for the number
        self.num_label = QLabel('Enter a number:')
        self.num_input = QLineEdit()

        # Create a label to display the result
        self.result_label = QLabel('Factorial:')

        # Create a button to calculate factorial
        self.calculate_button = QPushButton('Calculate Factorial')

        # Connect the button click event to the factorial calculation function

        # Add widgets to the layout

        # Set the layout for the main window

    def calculateFactorial(self):
            # Get the number from the input field
            num = int(self.num_input.text())

            # Check if the number is negative
            if num < 0:
                self.result_label.setText('Factorial is not defined for negative numbers')
                # Calculate the factorial
                result = 1
                for i in range(1, num + 1):
                    result *= i

                # Display the result
                self.result_label.setText(f'Factorial: {result}')
        except ValueError:
            # Handle invalid input (e.g., non-integer input)
            self.result_label.setText('Invalid input')

def main():
    app = QApplication(sys.argv)
    window = FactorialCalculator()

if __name__ == '__main__':

This code creates a PyQt application with a window containing an input field for the user to enter a number, a button to calculate the factorial, and a label to display the result. When the user enters a number and clicks the “Calculate Factorial” button, the factorial of the number is calculated and displayed in the label.

Make sure you have PyQt5 installed (pip install PyQt5) before running this code.


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