title: how to download pip dependencies locally?
body: <p>I am running my python application that has <code>requirements.txt</code> file which contains various dependencies. I am deploying this application in a Pivotal Cloud Foundry environment. However, the environment I am deploying in it airgapped. Therefore I can't seem to get the dependencies. </p>
  
  <p>The Git repo for python CF buildpack suggests that if an application has a <code>vendor</code> directory then it might get the dependencies from there: <a href="https://github.com/cloudfoundry/python-buildpack/blob/master/bin/steps/pip-install#L18" rel="noreferrer">https://github.com/cloudfoundry/python-buildpack/blob/master/bin/steps/pip-install#L18</a></p>
  
  <p>My question is, how can I download the dependencies mentioned in my <code>requirements.txt</code> file locally into a <code>vendor</code> folder?</p>