title: How to add environment variable value to YAML file?
body: <p>I'm having <code>.env</code> file. which contains:</p>
  <pre><code>User_Name= username
  Pass_Word= password
  </code></pre>
  <p>How to add the above variable values <code>username</code> and <code>password</code> only to the yaml.</p>
  <p>I mentioned in this way:</p>
  <pre><code>Website:
     USER:
       Login: ${User_Name}
       Pass: ${Pass_Word}
  </code></pre>
  <p>Expected Result while parsed in python file:</p>
  <pre><code>Login = username
  Pass = password
  </code></pre>
  <p>But I'm getting strings like below while I actually need to get <code>username</code> and <code>password</code>:</p>
  <pre><code>Login = '${User_Name}'
  Pass = '${Pass_Word}'
  </code></pre>