39812.html">4</a>]. Options are <a class="reference external" href="http://stackoverflow.com/a/7143496/554319">per user directories</a>, <a class="reference external" href="http://pypi.python.org/pypi/virtualenv">virtualenv</a>
or <a class="reference external" href="http://stackoverflow.com/a/4325047/554319">local installations</a>.</p>
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