title: How to install modules through paver in python?
body: <p>When using paver for python build, how can I write a conditional for checking if my user has the required installed modules? If not then to be able to install it through the script. This should be written in pavement.py.</p>
  
  <p>For an example, I am working with requests. When my user runs the build through paver, I want to be able to check to see if requests needs to be installed. It is like using pip, but in a paver script. </p>