An interesting way of laying out configurations for different deployment modes, such as production, testing, staging, and so on, can be cleanly done using the inheritance pattern of classes. As the project gets bigger, you can have different deployment modes such as development, staging, production, and so on, where each mode can have several different configuration settings, and some settings will remain the same.
We can have a default setting base class, and other classes can inherit this base class and override or add deployment-specific configuration variables.
The following is an example of our default setting base class:
class BaseConfig(object):
'Base config class'
SECRET_KEY = 'A random secret key'
DEBUG = True
TESTING = False
NEW_CONFIG_VARIABLE = 'my value'
class ProductionConfig(BaseConfig):
'Production specific config'
DEBUG = False
SECRET_KEY = open('/path/to/secret/file').read()
class StagingConfig(BaseConfig):
'Staging specific config'
DEBUG = True
class DevelopmentConfig(BaseConfig):
'Development environment specific config'
DEBUG = True
TESTING = True
SECRET_KEY = 'Another random secret key'Now, we can use any of the preceding classes while loading the application's configuration via from_object(). Let's say that we save the preceding class-based configuration in a file named configuration.py:
app.config.from_object('configuration.DevelopmentConfig')So, overall, this makes the management of configurations for different deployment environments flexible and easier.
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