查询

def fecth(data):
   print('33[1:43m这是查询33[0m')
   print('用户数据是',data)
   backdata='backend %s'%data
   with open('dog.txt','r')as read:
       for readline in read:
           if readline.strip()==backdata:
               continue
def add():
    pass
def change():
    pass
def delete():
    pass

#__name__='__main__'
if __name__=='__main__':
    # print('test')
    msg=''
    #1查询 2 添加 3修改 4删除
    msgdic={
        '1':fecth,
        '2':add,
        '3':change,
        '4':delete,
    }
    while True:
        print(msg)
        choice=input('输入你的选项：').strip()#。strip函数就是去除输入当中的空格、回车等
        #也可以制定去除x.strip('*')
        if not choice :continue
        if choice=='5':break
        data=input('请输入你的数据：').strip()

        msgdic[choice](data)

def fecth(data):
   print('33[1:43m这是查询33[0m')
   print('用户数据是',data)
   backdata='backend %s'%data
   with open('dog.txt','r')as read:#read代表文件的行
       tag=False
       for readline in read:
           if readline.strip()==backdata:
               tag=True
               continue#匹配到了直接下一次操作
               if readline.startswith('backend'):
                   # tag=False
                   break
               if tag:  # 为true
                print('33[1:43m%s33[0m'%readline,end='')#打印当前行

def add():
    pass
def change():
    pass
def delete():
    pass

#__name__='__main__'
if __name__=='__main__':
    # print('test')
    msg=''
    #1查询 2 添加 3修改 4删除
    msgdic={
        '1':fecth,
        '2':add,
        '3':change,
        '4':delete,
    }
    while True:
        print(msg)
        choice=input('输入你的选项：').strip()#。strip函数就是去除输入当中的空格、回车等
        #也可以制定去除x.strip('*')
        if not choice :continue
        if choice=='5':break

        data=input('请输入你的数据：').strip()

        msgdic[choice](data)