title: Fixing PATH for Python libraries using Bash
body: <p>I am attempting to install some Python libraries by executing variations of the following command in Bash:</p>
  <pre><code>pip install --user -U numpy
  </code></pre>
  <p>I installed Python3 using Homebrew.</p>
  <p>I then get variations of the following message each time:</p>
  <blockquote>
  <p>WARNING: The scripts f2py, f2py3 and f2py3.7 are installed in '/Users/x/Library/Python/3.7/bin' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.</p>
  </blockquote>
  <p>How can I fix this issue to avoid problems in the future?</p>