题解 | 配置文件恢复

import re


while True:
    try:
        std = {("reset",): "reset what", 
        ("reset", "board"): "board fault",
        ("board", "add"): "where to add",
        ("board", "delete"): "no board at all",
        ("reboot", "backplane"): "impossible",
        ("backplane", "abort"): "install first"}
        s = input().split()
        if len(s) > 2:
            print("unknown command")
        else:
            res = {}
            if len(s) == 1:
                for k, v in std.items():
                    if len(k) == 1:
                        if re.match(s[0], k[0]):
                            res[k] = v
            else:
                for k, v in std.items():
                    if len(k) == 2:
                        if re.match(s[0], k[0]) and re.match(s[1], k[1]):
                            res[k] = v
            if len(res) == 1:
                print(list(res.values())[0])
            else:
                print("unknown command")
    except:
        break