题解 | #字符串分隔#

import sys

for line in sys.stdin:
    a = line.rstrip()
    alen=len(a)
    if a is None:
        break
    elif  alen < 8:
        print(a+(8-alen)*'0')
    elif alen == 8:  
        print(a)
    else:  
        for i in range(0,alen,8):
            sub_list = a[i:i+8]
            if len(sub_list) < 8:
                print(sub_list+'0'* (8 - len(sub_list)))
            else:
                print(sub_list)

除了输入的for，只执行了一个for，应该不算是0(n²)吧。另外感觉写的复杂了，一定有更简单的方法。