python-envcfg 0.2.0

定义带有前缀的环境变量

$ cat .env  # should not checked into VCS
# values are valid JSON expressions
MYAPP_DEBUG=true
MYAPP_SECRET_KEY='"7950ad141c7e4b3990631fcdf9a1d909"'
MYAPP_SQLALCHEMY_DATABASE_URI='"sqlite:///tmp/myapp.sqlite3"'

创建Flask应用并从python-envcfg加载配置

$ cat myapp.py
...
app = Flask(__name__)
app.config.from_object('envcfg.json.myapp')  # MYAPP_ -> .myapp
...

使用这些环境变量进入您的应用

$ env $(cat .env | xargs) python myapp.py

创建一个Django项目，并将所有敏感配置项移动到环境变量中

$ cat djapp/settings.py  # codebase-scope config
...
INSTALLED_APPS = (
    'django.contrib.admin',
)
...

$ cat .env  # environment-scope config, should not checked into VCS
# values are valid JSON expressions
DJAPP_SECRET_KEY='"wo9g2o#jws=u"'
DJAPP_DEBUG=true
DJAPP_TEMPLATE_DEBUG=true

在settings.py模块的末尾添加导入语句

$ tail -n 2 djapp/settings.py
# importing all config items stored in the environment variables
from envcfg.json.djapp import *  # noqa

使用环境变量运行您的Django应用程序

$ env $(cat .env | xargs) python manage.py runserver

定义带有前缀的环境变量

$ cat .env
export TORAPP_PORT='8888'
export TORAPP_MYSQL_HOST='"127.0.0.1"'
export TORAPP_MYSQL_DATABASE='"database"'

创建一个Tornado项目并加载配置

$ cat torapp/server.py

from tornado.web import Application, RequestHandler
from tornado.ioloop import IOLoop
from tornado.options import define, options
from tordb import Connection


def options_from_object(*args, **kwargs):
    module = __import__(*args, **kwargs)
    for name, value in vars(module).items():
        name = name.lower()
        if name in options._options:
            options._options[name].set(value)


class IndexHandler(RequestHandler):
    def initialize(self):
        self.db = Connection(options.mysql_host, options.mysql_database)

    def get(self):
        pass  # some database operations with ``self.db``


application = Application([
    (r'/', IndexHandler),
])

define('port', type=int)
define('mysql_host', type=unicode)
define('mysql_database', type=unicode)
options_from_object('envcfg.json.torapp', fromlist=['torapp'])


if __name__ == '__main__':
    application.listen(options.port)
    IOLoop.instance().start()

运行您的Tornado应用程序

$ env $(cat .env | xargs) python server.py