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

[Pleiades]

This is the output I get in quotes with the below python code, however 6 is in the 6.txt file. How can I determine by print output if 6 is a perfect number or not? I know it is a perfect number!

"The number is not a Perfect number!
None"


Please Help I'm on to something big with easily determining Mersenne Prime Numbers. Once I have the below code fixed I can open large perfect numbers and then with my other py file I can differentiate between what numbers are perfect and not. The other code I will post here too after this is resolved and I will explain how its done. My other code is super fast at finding large perfect numbers!

KB = 1024
MB = 1024 * 1024
 
def perfect_number(file):
    
    for s in file:
        n = int(s)
        
sum1 = 0
def n():
 for i in range(1, n):
    if(n % i == 0):
        sum1 = sum1 + i
if (sum1 == n):
    print ("The number is a Perfect number!" )
else:
    print("The number is not a Perfect number!")
 
if __name__ == '__main__':
    with open('6.txt', buffering=1*MB) as bigggg:
        dr = file_perfect_number(bigggg)
    print(dr)