#增删改查之查
def look():
    while 1 :
        enter = input("查看:如www.oldboy.org\n")
        l = []
        flag = False
        with open("haproxy.conf") as enter_read:
            for line in enter_read:
                if line.startswith("backend") and enter in line:
                    flag = True
                    continue
                if line.startswith("backend") and flag:
                    break
                if flag:
                    l.append(line.strip())
            for out in l:
                print(out)
#增删改查之删
def delete():
    dels = input("删除:如www.oldboy.org\n")
    with open("haproxy.conf") as dels_read,open("text",mode="w") as dels_del:
        for line in dels_read:
            dels_del.write(line)
            if line.startswith("backend") and dels in line:
                break
#增删改查之改
def amend():
    modify = input("修改:如www.oldboy.org\n")
    servers = "        server 1111 weight 2222 maxconn 3333"
    with open("haproxy.conf") as modify_read,open("text",mode="w") as modify_m:
        for line in modify_read:
            modify_m.write(line)
            if line.startswith("backend") and modify in line:
                modify_m.write(servers)
                break
#增删改查之增
def add():
    agg = input("增加:如www.oldboy.org\n")
    servers = "        server 1111 weight 2222 maxconn 3333\n"
    with open("haproxy.conf") as agg_read, open("text", mode="w") as agg_a:
        for line in agg_read:
            agg_a.write(line)
            if line.startswith("backend") and agg in line:
                agg_a.write(servers)

#列表
def  list():
    user_list = ‘‘‘
        1.look 查看：
        2.delete 删除：
        3.amend 修改：
        4.add 增加：
        0.exit 退出：
        ‘‘‘
    print(user_list)

def mains():
    list()
    judge = input("弄什么:")
    if judge==1:
        look()
    if judge==2:
        delete()
    if judge==3:
        amend()
    if judge==4:
        add()
    if judge==0:
        exit()
mains()

04-09，Work-对文件的增删改查（函数）