练习-文本日志增加删除(指定字符串格式)

backend test.oldboy.orgb1

backend buy.oldboy.org

import json

s = ‘‘‘{"backend":"%s",
        "record":{
            "server":"%s",
            "weight":"%s",
            "maxcoon":"%s"
                }
        }‘‘‘


# 显示一级菜单
def p_1():
    print(‘1:增加一条记录‘,‘      2:删除一条记录‘)



# 显示二级菜单
def p_2():
    print(‘1:test.oldboy.org‘,‘     2:buy.oldboy.org‘)



#计算开始和结束位置
def ins_del(readlines):
    mstart = mend = None
    for i in readlines:
        if dic[‘backend‘] in i:
            mstart = readlines.index(i)
        elif None != mstart and i.strip() == ‘‘:
            mend = readlines.index(i,mstart)
            break
    else:
        mend = len(readlines)
        if not ‘\n‘ in readlines[mend - 1]:#如果结束行没有换行,就添加换行符
            readlines[mend - 1] += ‘\n‘
    return mstart,mend




while True:
    p_1()
    pt = input(‘选择增加还是删除:‘)
    if pt == ‘q‘:
        print(‘退出操作‘)
        exit()
    elif pt.isdigit() and int(pt) > 0 and int(pt) < 3:
        p_2()
        if int(pt) == 1:#增加
            while True:
                pt = input(‘选择要增加的类型:‘)
                if pt == ‘q‘:
                    print(‘退出操作‘)
                    exit()
                elif pt == ‘b‘:
                    break
                elif pt.isdigit() and int(pt) > 0 and int(pt) < 3:
                    server = input(‘输入server信息:‘)
                    weight = input(‘输入weight信息:‘)
                    maxcoon = input(‘输入maxcoon信息:‘)
                    if int(pt) == 1:
                        ts = s % (‘test.oldboy.org‘,server,weight,maxcoon)
                    else:
                        ts = s % (‘buy.oldboy.org‘,server,weight,maxcoon)
                    dic = json.loads(ts)#将字典格式字符串转换成字典(字符串内需用双引号)
                    with open(‘file.txt‘,‘r+‘) as f:
                        r = f.readlines()
                        mstart,mend = ins_del(r)
                        r.insert(mend,
                                 (‘\tserver {server} weight {weight} maxcoon {maxcoon}\n‘.format(**dic[‘record‘])))
                        f.seek(0)#readlines后指针的文件尾部,所以要移动指针到首部
                        f.writelines(r)#新增比原来行数多,会直接覆盖,所以不用清空原文件
                        break #跳出此次操作
                else:
                    print(‘未定义%s‘ % pt)

        else:#删除
            while True:
                pt = input(‘选择要删除的类型:‘)
                if pt == ‘q‘:
                    print(‘退出操作‘)
                    exit()
                elif pt == ‘b‘:
                    break
                elif pt.isdigit() and int(pt) > 0 and int(pt) < 3:
                    with open(‘file.txt‘,‘r‘) as f:
                        r = f.readlines()
                        if int(pt) == 1:
                            dic = {"backend": "test.oldboy.org",}
                        else:
                            dic = {"backend": "buy.oldboy.org",}
                        mstart,mend = ins_del(r)
                        tlist = list(r[mend:mstart:-1])#倒序切片列表
                        rcount = 1#倒序步进值,因为mend=空行或列表总行数,比实际下标多1,所以从1开始
                        for i in tlist:
                            if ‘server‘ in i:#判断是否是要删除的内容
                                #内容是倒的,所有查找索引也要从倒着开始,不然index默认找第一次出现的值
                                r.pop(r.index(i,mend - rcount))
                                break
                            rcount += 1
                    with open(‘file.txt‘,‘w‘) as f:#清空原始文本
                        f.writelines(r)
                        break
                else:
                    print(‘未定义%s‘ % pt)
    else:
        print(‘未定义%s‘ % pt)