title: Solving the invalid name for Python module warning in PyDev
body: <p>I encountered the <code>Invalid name for Python module: ...filename (it'll not be analyzed)</code> warning message in PyDev and I tried to resolve it by replacing <code>-</code> in the filename with <code>_</code> but the warning didn't disappeared. </p>
  
  <p>One of the problems is that in fact this is not a module, it's just a python script, still I get the warning and the warning says nothing about how to solve the issue.</p>
  
  <p>What are the real requirements for filenames (not necessary modules) and where are they specified (PIP)? </p>
  
  <p>How do I solve this problem in PyDev?</p>