正整数的质因数分解，如果输出1024怎么才能使输出结果为2呢

正整数的质因数分解，如果输出1024怎么才能使输出结果为2呢？

line = input().strip()
num_list = []
num_str = ""
j = 3
while int(line) % 2 == 0:
    num_list.append(2)
    line = int(line) / 2
while j <= int(line)**0.5:
    if int(line) % j == 0:
        num_list.append(j)
        line = int(line) / j
    else:
            j += 2
num_list.append(int(line))
try:
    num_list.remove(1)
except:
    pass
num_list = list(set(num_list))
print (",".join(map(str,num_list)))