config 写入

d代码：

# __author__ = liukun
# coding:utf-8
line = input("please input the config \n :")
#提示输入字符
#输入{"backend":"www.oldboy.org","record":{"server":"100.1.70.9","weight":20,"maxconm":3000}}
a_dict  = eval(line)#转换为字典
dict_b = a_dict['record']
line_b = a_dict['backend']
file_Read = open("config")#打开配置文件
file_Write = open("config.bak", 'w')#打开临时文件
file_test = file_Read.readline()#按行读取配置文件
while ('' != file_test):
    line = file_test.split()
    if line.count('backend') == 1 and line.count(a_dict['backend']) == 1 : #匹配域名所在行
        file_Write.write('\n' + file_test)
        string = "server %s weight %s maxconn %s" %(dict_b['server'], dict_b['weight'],dict_b['maxconm'])
        #写入值太长,先用变量格式化.
        file_Write.write('\t'*2 + string + '\n')#添加 两个tab保持缩进对齐,末尾换行
        file_test = file_Read.readline()
    else:
        file_Write.write(file_test)
        file_test = file_Read.readline()
file_Read.close()
file_Write.close()#遍历完毕,关闭文件
file_Read_2 = open("config.bak") #将 bak 文件内容回写源文件 config
file_Write_2 = open("config", 'w')
file_test_2 = file_Read_2.readline()
while ('' != file_test_2):
    file_Write_2.write(file_test_2)
    file_test_2 = file_Read_2.readline()
file_Read_2.close()
file_Write_2.close()

config：

global
        log 127.0.0.1 local2
        daemon
        maxconn 256
        log 127.0.0.1 local2 info
defaults
        log global
        mode http
        timeout connect 5000ms
        timeout client 50000ms
        timeout server 50000ms
        option  dontlognull

listen stats :8888
        stats enable
        stats uri       /admin
        stats auth      admin:1234

frontend oldboy.org
        bind 0.0.0.0:80
        option httplog
        option httpclose
        option  forwardfor
        log global
        acl www hdr_reg(host) -i www.oldboy.org
        use_backend www.oldboy.org if www

backend www.oldboy.org
		server 100.1.70.9 weight 20 maxconn 31111
		server 100.1.70.9 weight 20 maxconn 3000
		server 100.1.70.9 weight 20 maxconn 3000
		server 100.1.70.9 weight 20 maxconn 344444
		server 100.1.70.9 weight 20 maxconn 3000
		server 100.1.70.9 weight 20 maxconn 3000
        server 100.1.7.9 100.1.7.9 weight 20 maxconn 3000