title: Reading in environment variables from an environment file
body: <p>I'd like to run in a local environment a Python script which is normally run in a Docker container. The <code>docker-compose.yml</code> specifies an <a href="https://docs.docker.com/compose/env-file/" rel="noreferrer">env_file</a> which looks (partially) like the following:</p>
  
  <pre><code>DB_ADDR=rethinkdb
  DB_PORT=28015
  DB_NAME=ipercron
  </code></pre>
  
  <p>In order to run this locally, I would like these lines to be converted to</p>
  
  <pre><code>os.environ['DB_ADDR'] = 'rethinkdb'
  os.environ['DB_PORT'] = '28015'
  os.environ['DB_NAME'] = 'ipercron'
  </code></pre>
  
  <p>I could write my parser, but I was wondering if there are any existing modules/tools to read in environment variables from configuration files?</p>