python--------文件处理之增删改查--------作业用函数

1，刚学到函数，用的还不熟练，只能以简单的函数调用来实现.

2，  还是有bug。

3，代码：

def add():
    '''
    添加一条语句

    '''

    choice = input("please your input is {}  : ")
    # {"backend":"www.oldboy20.org","record":{"server":1111,"weight":2222,"maxconn":3333}}
    dic = eval(choice)  # 把字符串转成字典
    title = dic['backend']  # "www.oldboy20.org"
    record = dic['record']
    r_s = '        server %s weight %s maxconn %s
' 
          % (record['server'], record['weight'], record['maxconn'])

    with open("haproxy.conf", encoding="utf-8") as f_read, open("test3", mode="w", encoding="utf-8") as w_read:
        for line in f_read:
            w_read.write(line)
            if line.startswith('backend') and title in line:
                # print('11111>')
                w_read.write(r_s)
                # w_read.write('=====>')
        w_read.flush()



def search():
    '''
    查询
     
    '''

    list = []
    flag = False
    input1 = input("plesae input 'www.oldboy1.org' :")
    with open("haproxy.conf", encoding="utf-8") as f_read:
        for line in f_read:
            if line.startswith("backend") and input1 in line:
                flag = True

                continue

            if line.startswith("backend"):
                break
            if flag:
                list.append(line.strip())
    print("hello".center(50, "-"))

    for i in list:
        print(i)



def delete():
    '''
    删除
    
    '''

    choice = input("please your input  is {} :")
    # {"backend":"www.oldboy20.org","record":{"server":1111,"weight":2222,maxconn:3333}}
    dic = eval(choice)  # 把输入的字符串转成字典
    tltle = dic["backend"]
    tetle1 = dic["record"]  #这个没有用
    with open("haproxy.conf", encoding="utf-8") as f_read, open("test5", "w", encoding="utf-8") as w_write:

        for line in f_read:
            w_write.write(line)
            if line.startswith("backend") and tltle in line:
                # w_write.write(line)
                break


def change():
    '''
    修改一条语句
     
    '''

    choice = input("please your input is {} :")
    # {"backend":"www.oldboy20.org","record":{"server":1111,"weight":2222,"maxconn":3333}}
    dic = eval(choice)  #把输入的字符串转成字典
    tltel = dic["backend"]
    tltel1 = dic["record"]
    dic["record"]["server"] = "0000"
    dic["record"]["weight"] = "0000"
    dic["record"]["maxconn"] = "0000"
    # print(dic)
    #格式化字符串
    r_s = "        server %s weight %s maxconn %s" % (tltel1["server"], tltel1['weight'], tltel1["maxconn"])
    with open("haproxy.conf", encoding="utf-8") as f_read, open("test6", mode="w", encoding="utf-8") as w_write:
        for line in f_read:
            w_write.write(line) # 把line中的字符串写到w_write中
            if line.startswith("backend") and tltel in line: #判断 line中字符串否以“backend”开头，并且满不满足tetle在这行
                w_write.write(r_s)  #把字符串写入到w_rite中
                break   #跳出循环


def can_msg():
    '''
    菜单
     
    '''
    msg = '''
     1,search: 查询
     2,add   : 添加
     3,delete: 删除
     4,change: 修改
     0,exit(0):退出
    
    '''
    print(msg)

def main1():
    '''
    主函数
     
    '''
    while True :
        can_msg()
        choice = input("please your input choice  or exit(0):")
        if choice == "0" :
            print("good bye".center(50,"-"))
            print("再_见".center(50,"-"))
            exit()
        elif choice == "1":
            search()
        elif choice == "2":
            add()
        elif choice == "3":
            delete()
        elif choice == "4":
            search()
        else:
            print("请输入数字 谢谢 ".center(50, "-"))
            continue





if __name__ == '__main__':
     main1()