title: Check Python 3 source with Pylint running with Python 2
body: <p>Some checks of Pylint are depending on whether the checked source code is of kind Python 2 or Python 3. E.g., see <a href="https://stackoverflow.com/questions/22235021/how-to-avoid-pylint-warnings-for-constructor-of-inherited-class-in-python-3">How to avoid Pylint warnings for constructor of inherited class in Python 3?</a>.</p>
  
  <p>In my setup I run Pylint on a development server, which is using Python 2.7. However, I use Pylint to automatically check Python 3 code on each commit.</p>
  
  <p>How can I configure Pylint to perform checking for Python 3, even if it runs under Python 2?</p>