The program that will show the kaprekar constant, Given a 4 digit number it will show how many steps it take to reach to kaprekar constant.

kaprekar_constant.py

def kaprekar_constant(num):
    steps = 0
    while num != 6174:
        # Convert number to a 4-digit string, padding with zeros if necessary
        num_str = f"{num:04d}"

        # Sort digits in ascending and descending order
        asc = int(''.join(sorted(num_str)))
        desc = int(''.join(sorted(num_str, reverse=True)))

        # Calculate the difference
        num = desc - asc
        steps += 1

        # Print each step
        print(f"Step {steps}: {desc} - {asc} = {num}")

        # Check if the number has become 6174
        if num == 6174:
            print(f"Reached Kaprekar's constant in {steps} steps.")
            return steps

        # Check for 4-digit numbers with all same digits (e.g., 1111)
        if len(set(num_str)) == 1:
            print("This number will not reach Kaprekar's constant.")
            return -1

# Test the function
number = int(input("Enter a 4-digit number: "))
kaprekar_constant(number)