题解 | #配置文件恢复#

while True:
    try:
        str_list = input().split()
#         print(str_list)
        key = [('reset','board'),('board','add'),('board','delete'),
               ('reboot','backplane'),('backplane','abort')]
        value = ['board fault','where to add','no board at all',
                'impossible','install first']
        c = []
        d = []
        #输入空
        if len(str_list) < 1: 
            print(' ')
        #超过两个字符
        elif len(str_list) > 2 : 
            print('unknown command')
        #输入1串字符直接判断
        elif len(str_list) == 1: 
            if str_list[0] in 'reset':
                print('reset what')
            else:
                print('unknown command')
        #输入两串字符
        elif len(str_list) == 2: 
            for i in range(5):#匹配第一个字符串
                if str_list[0] in key[i][0]:
                    c.append(i)
            #判断第一个字符串
            if len(c) == 0:#没匹配到
                print('unknown command')
            elif len(c) == 1:#匹配唯一
                print(value[c[0]])
            else:#匹配多个
                for i in c:#遍历匹配的多个
                    if str_list[1] in key[i][1]:
                        d.append(i)
                #判断第二个字符匹配结果
                if len(d) == 1:#唯一结果
                    print(value[d[0]])
                else:#其他
                    print('unknown command')
#         print(c)
    except:
        break