Python Code Example: Perfect number

The code starts by initializing a variable sum to 0, which will be used to keep track of the sum of the proper divisors of the input number.

Next, the code asks the user to input a number, and converts the input to an integer using the int function. The input value is then stored in the variable number.

The code then uses a for loop to iterate over the numbers from 1 to number – 1. For each number i in the range, the code uses an if statement to check if i is a proper divisor of number, which means that number is divisible by i without a remainder. If number is divisible by i, the code adds i to the sum variable.

After the for loop, the code uses another if statement to check if the sum of the proper divisors of number is equal to number. If sum is equal to number, the code prints the message “X is a perfect number”, where X is the value of number. If sum is not equal to number, the code prints the message “X is not a perfect number”.

The str function is used to convert the value of number to a string representation, so that it can be concatenated with the string literals in the print statements.

This code demonstrates how to use a for loop and an if statement to determine if a number is a perfect number, which is a positive integer that is equal to the sum of its proper divisors.

sum = 0
number = int(input("Enter a number to check for perfect: "))

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

if sum == number:
    print(str(number) + " is a perfect number")
else:
    print(str(number) + " is not a perfect number")
Output
Enter a number to check for perfect: 28
28 is a perfect number