Use different Python version with virtualenv

<span class="pln">virtualenv </span><span class="pun">-</span><span class="pln">p </span><span class="pun">/</span><span class="pln">usr</span><span class="pun">/</span><span class="pln">bin</span><span class="pun">/</span><span class="pln">python2</span><span class="pun">.</span><span class="lit">6</span> <span class="pun"><</span><span class="pln">path</span><span class="pun">/</span><span class="pln">to</span><span class="pun">/</span><span class="pln">new</span><span class="pun">/</span><span class="pln">virtualenv</span><span class="pun">/></span>