title: No module named antlr4 in python 2.7
body: <p>I would like to use ANTLR4 with Python 2.7 and for this I did the following:</p>
  
  <ol>
  <li><p>I installed the package <code>antlr4-4.6-1</code> on Arch Linux with <code>sudo pacman -S antlr4</code>.</p></li>
  <li><p>I wrote a <code>MyGrammar.g4</code> file and successfully generated Lexer and Parser Code with <code>antlr4 -Dlanguage=Python2 MyGrammar.g4</code></p></li>
  <li><p>Now executing for example the generated Lexer code with <code>python2 MyGrammarLexer.py</code> results in the error <code>ImportError: No module named antlr4</code>. </p></li>
  </ol>
  
  <p>What could to be the problem? FYI: I have both Python2 and Python3 installed - I don't know if that might cause any trouble.</p>