Map a python configuration from environment variables
Map a python configuration from environment variables.
environmental allows you to map class properties to environment variables.
By using environmental you can keep your configuration in a single class your IDE understands and have convenient and safe type conversions between the strings stored in your environment and python types.
The created properties are also writable so if you assign to them they will change on your environment and will be available to your child processes.
$ sudo pip3 install --upgrade environmental
import environmental import os class Configuration: port = environmental.Int('MY_APPLICATION_HTTP_PORT', 80) name = environmental.Str('MY_APPLICATION_NAME', 'Name') config = Configuration() config.port = 8080 assert os.environ['MY_APPLICATION_HTTP_PORT'] == '8080' assert isinstance(os.environ['MY_APPLICATION_HTTP_PORT'], str) assert config.port == 8080 assert isinstance(config.port, int)
Modifying mutable objects in the configuration (like lists) will not work:
import os, environmental class Configuration: list = environmental.List('LIST') os.environ['LIST'] = "" assert config.list ==  config.list.append('test') assert config.list == 
But doing something that reassigns the variable will:
config.list += ['test'] assert config.list == ['test']
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