[Python] Config Parser 사용법

Create Config Parser 

# config_file_create.py

from configparser import ConfigParser

config = ConfigParser()

config['settings'] = {
    'debug': 'true',
    'secret_key': 'abc123',
    'log_path': '/my_app/log'
}

config['db'] = {
    'db_name': 'myapp_dev',
    'db_host': 'localhost',
    'db_port': '8889'
}

config['files'] = {
    'use_cdn': 'false',
    'images_path': '/my_app/images'}
    
with open('./dev.ini', 'w') as f:
   config.write(f)

dev.ini

 

# dev.ini

[settings]
debug = true
secret_key = abc123
log_path = /my_app/log

[db]
db_name = myapp_dev
db_host = localhost
db_port = 8889

[files]
use_cdn = false
images_path = /my_app/images

Read Config Parser

 

# config_file_read.py

from configparser import ConfigParser

parser = ConfigParser()
parser.read('dev.ini')

print(parser.sections())  # ['settings', 'db', 'files']
print(parser.get('settings', 'secret_key'))  # abc123
print(parser.options('settings'))  # ['debug', 'secret_key', 'log_path']
print('db' in parser)  # True
print(parser.get('db', 'db_port'), type(parser.get('db', 'db_port')))  # 8889 <class 'str'>
print(int(parser.get('db', 'db_port')))  # 8889 (as int)
print(parser.getint('db', 'db_default_port', fallback=3306))  # 3306print(parser.getboolean('settings', 'debug', fallback=False))  # True

Using String Interpolation

 

# config_file_create.pyfrom configparser import ConfigParser

config['settings'] = {
    'debug': 'true',
    'secret_key': 'abc123',
    'log_path': '/my_app/log',
    'python_version': '3',
    'packages_path': '/usr/local'
}


config['files'] = {
    'use_cdn': 'false',
    'images_path': '/my_app/images',
    'python_path': '${settings:packages_path}/bin/python${settings:python_version}'
}

${<section name>:<option name>} 형태로 path 잡아주기 

 

# config_file_read.py

from configparser import ConfigParser, ExtendedInterpolation

parser = ConfigParser(interpolation=ExtendedInterpolation())
parser.read('dev.ini')

print(parser.get('files', 'python_path'))  # /usr/local/bin/python3