title: PyLint "Unable to import" error - how to set PYTHONPATH?
body: <p>I'm running PyLint from inside Wing IDE on Windows. I have a sub-directory (package) in my project and inside the package I import a module from the top level, ie.</p>
  
  <pre><code>__init__.py
  myapp.py
  one.py
  subdir\
      __init__.py
      two.py
  </code></pre>
  
  <p>Inside <code>two.py</code> I have <code>import one</code> and this works fine at runtime, because the top-level directory (from which <code>myapp.py</code> is run) is in the Python path. However, when I run PyLint on two.py it gives me an error:</p>
  
  <pre><code>F0401: Unable to import 'one'
  </code></pre>
  
  <p>How do I fix this?</p>