title: runnig python tests via teamcity: Error: Source not found
body: <p>I want to use teamcity as CI for my python project. My project use virtualenv to store project related dependencies. So I create venv folder under project root and put env. related stuff there.</p>
  
  <p>But when I trying to create build step with <code>source venv/bin/activate</code> as custom script - it fails with <code>source: not found</code>, if i creating this step also as command line, but executable file and put <code>source</code> as file and <code>venv/bin/activate</code> as parameter, then it fails with <code>Cannot run process source venv/bin/activate : file not found</code></p>
  
  <p>How to solve this?</p>