can not override environment settings that already have value with a file

I have

env = environ.Env(
    DEBUG=(bool, False),
)
ENV_FILE = str(env.path('ENV_FILE', default='/'))
if os.path.isfile(ENV_FILE):
    overrides = {'DATABASE_URL': os.environ.pop('DATABASE_URL', '')}
    env.read_env(env_file=ENV_FILE, **overrides)
else:
    # unset if no file was found
    ENV_FILE = None

Problem is that in my ENV_FILE, I want to set DATABASE_URL that already has a value when reading the ENV_FILE.

But because def read_env(env_file=None, **overrides) uses setdefault(key, str(val)) this value can not be overwritten.

Is it possible to extend def read_env with an extra boolean argument to decide whether or not to override existing environment variables?

[patrickjrm]

+1 for merging PR #191.

The similar python-dotenv project does have an override=True option.

https://github.com/theskumar/python-dotenv#getting-started

[mpochron]

Simple to load env file to override environments from settings:

overrides = {key: os.environ.pop(key, value) for key, value in os.environ.items()}
environ.Env.read_env(env_file=str(ROOT_DIR.path('.env')), **overrides)