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📌 Step-by-Step Execution of Python Factorial Program

In this video, experience a visual step-by-step execution of a simple Python program to calculate the factorial of a number using a for loop. We walk through each line of code, explaining how Python processes user input, initializes variables, performs looping, and calculates the factorial of the given number.
🔁 Algorithm:

Input a number from the user.

Convert the input to an integer using the int() function.

Initialize a variable factorial with the value 1.

Use a for loop to multiply factorial by each number from 1 to the input number.

After the loop ends, print the result stored in factorial.

🧠 Understanding the for loop in Python:

A for loop is used to iterate over a sequence (like a range of numbers).

range(1, n+1) generates numbers from 1 to n, inclusive.

Inside the loop, the factorial variable is multiplied step by step with each number in the range.

Example:

num = int(input("Enter a number: "))
factorial = 1
for i in range(1, num + 1):
factorial *= i
print("Factorial:", factorial)

🔍 Topics Covered:

✔ Input Handling in Python
✔ Integer Type Conversion with int()
✔ Looping with for
✔ Factorial Calculation Logic
✔ Variable Initialization and Accumulation
✔ Step-by-step Code Execution Flow
✔ Understanding range() in Python

🎯 Perfect for beginners learning how loops work in Python and how to break down problem-solving into clear, logical steps.

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