题解 | #配置文件恢复#

#题中有说明要从首字母开始匹配，所以匹配时不能用in！！！
while 1:
    try:
        a=input().split()  #将命令分开存到列表
    except:
        break
    else:
        s=[]
        if len(a)==1:
            if a[0]=='reset'[:len(a[0])]:  
                print('reset what')
                continue
            else:
                print('unknown command')
                continue
        elif len(a)==2:
            if a[0] == 'reset'[:len(a[0])]:
                if a[1] == 'board'[:len(a[1])]:
                    s.append('board fault')
            if a[0] == 'board'[:len(a[0])]:
                if a[1] == 'add'[:len(a[1])]:
                    s.append('where to add')
                if a[1] == 'delete'[:len(a[1])]:
                    s.append('no board at all')
            if a[0] == 'reboot'[:len(a[0])]:
                if a[1] == 'backplane'[:len(a[1])]:
                    s.append('impossible')
            if a[0] == 'backplane'[:len(a[0])]:
                if a[1] == 'abort'[:len(a[1])]:
                    s.append('install first')
        if len(s)==0 or len(s)>1:
            print('unknown command')
        else:
            print(s[0])