Perfect number

perfect_number.py

upper_bound = int(input("Upper bound: "))

n = 1
while n <= upper_bound:
    factors = []
    i = 1
    while i < n:
        if n % i == 0:
            factors.append(i)
        i += 1
    if sum(factors) == n:
        print(n)
    n += 1