我们需要实现一个简单的服务器管理工具（命令行工具）,该工具只需要支持以下功能：添加服务器（add 命令）：支持以下参数 -h hostip，-u user，-p password列出服务器（list 命令）：没有参数，列出当前存储的所有服务器信息 删除服务器（delete）：支持参数 -h hostip。成功的话无输出。

server.py

import click
import os


@click.group()
def cli():
    pass


@cli.command()
@click.option('-h', help='host ip')
@click.option('-u', help='user')
@click.option('-p', help='password')
def add(h, u, p):
    if not h or not u or not p:
        click.echo('ERROR')
        return False
    string = '%s %s %s \n' % (h, u, p)
    if is_in_file(string):
        with open('store.txt', 'a') as f:
            f.write(string)
            f.close()


@cli.command()
@click.option('-h', help='host ip')
def delete(h):
    with open('store.txt', 'w+') as f:
        a_t = f.readlines()
        for i in a_t:
            if h in i:
                a_t.remove(i)
        f.writelines(a_t)
        f.close()


@cli.command()
def list():
    with open('store.txt', 'r') as f:
        for i in f.readlines():
            click.echo(i)


def is_in_file(hup):
    with open('store.txt', 'r') as f:
        if hup in f.read():
            click.echo('ERROR')
            return False
        f.close()
        return True


if __name__ == '__main__':
    if not os.path.isfile('store.txt'):
        open('store.txt', 'w').close()
    cli()