Help with try and open 6.txt file and print as perfect or not

[Pleiades]

I had to define f
def f(): thats all and here is the code.

import math
 
KB = 1024
MB = 1024 * 1024
 
def perfect_number(number, factors):
    sum_of_factors = sum(factors) - number
    if sum_of_factors == number:
        def f():
         return f#"The number {number} is a Perfect number!"
    else:
        return f#"The number {number} is not a Perfect number!"
 
def factor_number(n):
    root = int(round(math.sqrt(n), 0))
    return [(x, n // x) for x in range(1, root + 1) if n % x == 0]
 
if __name__ == '__main__':
    with open('6.txt', buffering=1*MB) as bigggg:
        for num in bigggg:
            number = int(num)
            factors = []
 
            for pair in factor_number(number):
                factors.extend(pair)
 
            print(perfect_number(number, factors))
 
    factors = []
 
    for pair in factor_number(6):
        factors.extend(pair)
 
    print(perfect_number(6, factors))