title: using pipenv - cannot import packages (numpy, pandas etc) from pipfile from active environment
body: <p>this is a weird problem for me and now I have no clue what's wrong. I have my pipenv working but when I try to activate the environment using pipenv shell:</p>
  <ol>
  <li>first it does not show the environment name in (brackets) followed by the file path.</li>
  <li>but when I try pipenv shell again it says &quot;Shell for C:\Users\bupadhy.virtualenvs\trry-bbxJiZoF already activated&quot;</li>
  <li>Okay maybe the environment is active? then I install a package - say numpy, it gets installed and pipfile and pipfile.lock are created.</li>
  <li>But when I try to import numpy in a file in the directory, it says package not found.</li>
  </ol>
  <p>I tried reinstalling everything but did not work.</p>