So, you’re developing a Python application.
And, you have needs for “production” versus “development” configs.
If you’re using a web framework, you might have some support for doing this, but what about your other modules that you’d like to configure in a similar way?
What you sort of want to be able to say, anywhere, is something like this:
import config
if config.MODULE['parameter'] == 'value':
# do something
else:
# do something else
And, you want “import config” to automatically decide (via some means) if it’s in production or development.
Great, here’s a really simple pattern for you.
Make a directory named “config” put it somewhere on your python import path. (It’s okay if this is app.config or some_module.config, whatever you want.) Make the __init__ look like this:
class Config(object):
pass
if some_condition:
from config.production import ProductionConfig
config = ProductionConfig
else:
config = DevelopmentConfig
You need to write some_condition yourself. You’ll probably do something like check for existance of a file, check the hostname, look at an environment variable, whatever.
Then, create config/production.py and config/development.py and make them look pretty much like this:
from config import Config
class DevelopmentConfig(Config):
MODULE = { 'param': 'value' }
OTHER_MODULE = { 'other_param': 'other_value' }
# etc.
Make sure that production and development configs both specify the same arguments. If you have shared things you want to configure, then you can make “base.py” or “shared.py” and derive from that.
Happy hacking!
