python读取配置文件

从/mnt目录下读取section配置文件sample.ini

[db]
host=192.168.1.116
hostaddr=192.168.1.116
port=5432
dbname=class4_db
user=class4_user
password =
[web_db]
host=db.$hostaddr
port=db.$port
dbname=db.$dbname
user=db.$user
password=db.$password

代码：

import os
import ConfigParser
os.chdir('/mnt')
config=ConfigParser.ConfigParser()
cfgfile=open("sample.ini","rw")
config.readfp(cfgfile)
db_host=config.get("db","host")
db_user=config.get("db","user")
print(db_host)
print(db_user)
config.set("db","host","192.168.1.1")
config.set("db","port","")
db_host=config.get("db","host")
db_port=config.get("db","port")
print(db_host)
print(db_port)
cfgfile.close()

执行结果：

/usr/bin/python2.7 /home/alex/PycharmProjects/py2_practise/ini_modify.py
192.168.1.116
class4_user
192.168.1.1
21Process finished with exit code 0