ConfigParser 使用

 在程序中使用配置文件来灵活的配置一些参数是一件很常见的事情，配置文件的解析并不复杂，在python里更是如此，在官方发布的库中就包含有做这件事情的库，那就是ConfigParser，这里简单的做一些介绍。
ConfigParser解析的配置文件的格式比较象ini的配置文件格式，就是文件中由多个section构成，每个section下又有多个配置项，比如：

[db]
db_host=127.0.0.1
db_port=3306
db_user=root
db_pass=password
[concurrent]
thread=10
processor=20

假设上面的配置文件的名字为test.conf。里面包含两个section,一个是db, 另一个是concurrent, db里面还包含有4项，concurrent里面有两项。这里来做做解析：

# -*- encoding: gb2312 -*-
import ConfigParser
import string, os, sys

cf = ConfigParser.ConfigParser()
cf.read( " test.conf " )
# 返回所有的section
s = cf.sections()
print ' section: ' , s

o = cf.options( " db " )
print ' options: ' , o

v = cf.items( " db " )
print ' db: ' , v

print ' - ' * 60
# 可以按照类型读取出来
db_host = cf.get( " db " , " db_host " )
db_port = cf.getint( " db " , " db_port " )
db_user = cf.get( " db " , " db_user " )
db_pass = cf.get( " db " , " db_pass " )

# 返回的是整型的
threads = cf.getint( " concurrent " , " thread " )
processors = cf.getint( " concurrent " , " processor " )

print " db_host: " , db_host
print " db_port: " , db_port
print " db_user: " , db_user
print " db_pass: " , db_pass

print " thread: " , threads
print " processor: " , processors
# 修改一个值，再写回去
cf.set( " db " , " db_pass " , " zhaowei " )
cf.write(open( " test.conf " , " w " ))