Day 14 : Python Program to check whether the given number is perfect number

 

def perfect_num(number):

    return number > 0 and sum(i for i in range(1, number) if number % i == 0) == number

num = int(input("Enter a number: "))

if perfect_num(num):

    print(f"{num} is a perfect number.")

else:

    print(f"{num} is not a perfect number.")

Explanation:

1. The perfect_num Function

def perfect_num(number):

   return number > 0 and sum(i for i in range(1, number) if number % i == 0) == number

number > 0: 

Ensures the input is a positive integer. A perfect number must be positive.

sum(i for i in range(1, number) if number % i == 0):

Uses a generator expression to calculate the sum of all divisors of number (excluding the number itself).

i for i in range(1, number) iterates over all integers from 1 up to (but not including) number.

if number % i == 0 ensures that only divisors of number (numbers that divide evenly into number) are included.

== number: Checks if the sum of the divisors equals the original number, which is the defining condition for a perfect number.

2. Input from the User

num = int(input("Enter a number: "))

The user is prompted to enter a number.

The input is converted to an integer using int.

3. Check if the Number is Perfect

if perfect_num(num):

    print(f"{num} is a perfect number.")

else:

   print(f"{num} is not a perfect number.")

Calls the perfect_num function with the user input (num) as an argument.

If the function returns True, the program prints that the number is a perfect number.

Otherwise, it prints that the number is not a perfect number.

 #source code --> clcoding.com