"""Environment.

==========================
Module to to make it easy to determine environment based on what the
system's environment variable is set to (default to 'dev' if none set).
"""

import os

DEV = 'dev'
PROD = 'prod'
SHADOW = 'shadow'
TEST = 'test'
QA = 'qa'

name = os.environ.get('Environment', DEV)
if name not in [DEV, PROD, TEST, SHADOW, QA]:
    raise Exception(
        'Environment value ({env}) is not valid.'.format(env=name))