文件操作之增删改查应用

def delect():    ‘删除一行信息‘# m = www.oldboy2.org    while 1 :        flag = False        m = input(‘please input which url you want to delect:‘)        with open(‘haproxy.conf‘,encoding = ‘utf8‘) as f_read,open(‘delect‘,‘w‘,encoding = ‘utf8‘) as f_write:            for line in f_read:                if line.startswith(‘backend‘)and m in line :                    flag = True                    continue                if line.startswith(‘backend‘) and flag :                    flag = False                if flag :                        continue                f_write.write(line)        if m == ‘q‘:            exit()def select():    ‘查找一行信息‘    #m = www.oldboy2.org    while 3:        m = input(‘please input which url you want to selet:‘)        l = []        flag = False        with open(‘haproxy.conf‘, encoding=‘utf8‘)as f_read:            for line in f_read:                if line.startswith(‘backend‘) and m in line:                    flag = True                    continue                if line.startswith(‘backend‘) and flag:                    flag = False

if flag:                    l.append(line.strip())

for i in l:            print(i)        if m == ‘q‘:            exit()def insert():    ‘增加一些信息‘    while 1:        url =  input (‘please input the url‘)        ttt = input(‘please input what you what to insert:‘)        with open(‘haproxy.conf‘, encoding=‘utf8‘)as f_read,open(‘insert‘,‘a‘,encoding = ‘utf8‘)as f_write:            for line in f_read:                if line.startswith(‘backend‘) and url in line:                    f_write.write(line)                    f_write.write(‘\t\t‘+ttt+‘\n‘)                else:                    f_write.write(line)        if url == ‘q‘:            exit()def change():    ‘改变某一行的信息‘    l = []    flag = True    while 1:        url =  input (‘please input the url:‘)        with open(‘haproxy.conf‘, encoding=‘utf8‘)as f_read:            for line in f_read:

if line.startswith(‘backend‘) and url in line:                    flag = False                    continue                if line.startswith(‘backend‘) and flag == False:                    flag = True                if flag == False:                    l.append(line.strip())        print(l)        ttt = input(‘please input what you what to change:‘)        ccc = input(‘please input what you want to write:‘)        l[l.index(ttt)]= ccc        with open(‘haproxy.conf‘, encoding=‘utf8‘)as f_read,open(‘change‘, ‘a‘, encoding=‘utf8‘)as f_write:            for line in f_read:

if ttt in line:                    f_write.write(ccc+‘\n‘)                    continue                f_write.write(line)        if url == ‘q‘:            exit()def tell_msg():    print("""       ********************        删除 : delect        查找 : select        增加 : insert        改变 : change       ********************    """ )msg = {    ‘delect‘:delect,    ‘select‘:select,    ‘insert‘:insert,    ‘change‘:change}def main():    tell_msg()    m = input(‘please input your choice:‘)    msg[m]()    if m == ‘q‘:        exit()main()