title: Pip freeze for packages installed with --target
body: <p>I would like to use for a small Python project this way of managing dependent modules:
  <a href="http://blog.zoomeranalytics.com/pip-install-t/" rel="noreferrer">http://blog.zoomeranalytics.com/pip-install-t/</a></p>
  
  <p>In brief, I would do:</p>
  
  <p><code>cd myproject</code></p>
  
  <p><code>pip install --target ./pip-libs --upgrade -r requirements.txt</code></p>
  
  <p>then add ./pip-libs to PYTHONPATH and run my script.</p>
  
  <p>This seems but I like to use use pip freeze and it does not allow me to do anything like </p>
  
  <p><code>pip freeze --target pip-libs</code></p>
  
  <p>to see packages installed in the folder. Of course, I can take a look inside but what is a standard way to show packages installed in a folder with --target? The only way I can think of is doing <code>ls</code> of pip-libs and then playing with grep, awk... Does not seem right.</p>
  
  <p>I am not sure if there is a way, maybe it's not a good idea or I should request such functionality for pip.</p>
  
  <p>Python 2.7.9.</p>