``virtualenv`` is a tool to create isolated Python environments.
It creates an environment that has its own installation directories,
that doesn't share libraries with other virtualenv environments
(and optionally doesn't use the globally installed libraries either).
Usage: virtualenv YOUR_NEW_PYTHON_ENV
WWW: https://virtualenv.pypa.io
===> The following configuration options are available for py36-virtualenv-15.1.0:
DOCS=on: Build and/or install documentation
===> Use 'make config' to modify these settings
Convert Python ports to FLAVORS.
Ports using USE_PYTHON=distutils are now flavored. They will
automatically get flavors (py27, py34, py35, py36) depending on what
versions they support.
There is also a USE_PYTHON=flavors for ports that do not use distutils
but need FLAVORS to be set. A USE_PYTHON=noflavors can be set if
using distutils but flavors are not wanted.
A new USE_PYTHON=optsuffix that will add PYTHON_PKGNAMESUFFIX has been
added to cope with Python ports that did not have the Python
PKGNAMEPREFIX but are flavored.
USES=python now also exports a PY_FLAVOR variable that contains the
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