title: Install pipenv using brew on Python 3.6
body: <p>I am trying to install pipenv using Homebrew as suggested in <a href="https://pipenv.readthedocs.io/en/latest/install/#installing-pipenv" rel="noreferrer">here</a>.</p>
  
  <p>First, I ran <code>$ brew install pipenv</code>. Then, brew install python 3.7 automatically and I can use pipenv properly. But, I want to use pipenv on Python 3.6, so I ran <code>$ brew switch python 3.7 3.6.5</code> and then when I tried <code>$ pipenv install</code> an error appeared as follow:</p>
  
  <pre><code>dyld: Library not loaded: @executable_path/../.Python
    Referenced from: /usr/local/Cellar/pipenv/2018.11.26/libexec/bin/python3.7
    Reason: image not found
  Abort trap: 6
  </code></pre>
  
  <p>Is there any solution to install pipenv along with Python 3.6.5?</p>
  
  <p>Thank you.</p>