An incomplete configuration shall not pass.
pip install wizconfig
class TestConfig(WizConfig):
TEST_KEY = os.getenv("TEST_KEY") # mandatory
TEST_API_KEY = os.getenv("TEST_API_KEY"), False # optional
TEST_DEBUG = os.getenv("TEST_DEBUG"), True # mandatory (verbose)
TEST_MODE = os.getenv("TEST_MODE", "DEV") # mandatory with default value