magicenv

Simple way to parse common datatypes from env vars.

Setup

pip install magicenv

Usage

from magicenv import env

DB_HOST = env('DB_HOST', "localhost:1234")              # string var
DB_NUM_TRANSACTIONS = env('DB_NUM_TRANSACTIONS', 1234)  # int var
ENABLE_FEATURE_X = env('ENABLE_FEATURE_X', True)  # bool var

DB_SERVERS = env('DB_SERVERS', ['server1', "server2"])  # interprets a comma separated string as a list

env()

def env(key, default=None, return_type=None, list_element_type=str):

​ If key is not present in environment, and there is not provided a default value, ​ None will be returned.

Guidelines for settings in Environment

A couple of conventions exist when designing environment variables for settings.

1. All values are stored as strings in the environment variable

2. Booleans All boolean variables are encoded as one of "1", "True" or "true" if True, all other values are interpreted as False

3. Lists are encoded as a comma separated string in example: "a,b,c, d" (intentionally put whitespace in there. It is allowed)

4. Default Values are preffered to be set to the same type as the setting.

The type of the default value implicitly sets the datatype of the env var. May be overriden by setting return_type explicitly.

• list -> [],
• str -> ''
• int -> 0
• bool -> True or False