pyhton函數 判斷是否為完數

def wan(n):
    sum = 0
    i = 1
    while i <= n - 1:
        if n % i == 0:
            sum += i
        i += 1
    if sum == n:
        return True
    else:
        return False
wan = wan(int(input("請輸入一個數：")))
if wan:
    print("是完數")
else:
    print("不是完數")