How to read environment variables from Python env file?

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How can I read in environment variables from a python env file for a script that is typically run in a Docker container?

In the Docker setup, the docker-compose.yml specifies an env_file with entries like:

DB_ADDR=rethinkdb
DB_PORT=28015
DB_NAME=ipercron

To run this locally, I want to convert these lines into:

os.environ['DB_ADDR'] = 'rethinkdb'
os.environ['DB_PORT'] = '28015'
os.environ['DB_NAME'] = 'ipercron'

Rather than writing a custom parser, are there any existing Python modules or tools to read environment variables from a python env file?