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+Very often though, a user or developer wants ``easy_install`` to install and manage python packages
+..  There are older ways to achieve custom installation using various ``easy_install`` and ``setup.py install`` options, combined with ``PYTHONPATH`` and/or ``PYTHONUSERBASE`` alterations, but all of these are effectively deprecated by the User scheme brought in by `PEP-370`_ in Python 2.6.
+..  Prior to Python2.6, Mac OS X offered a form of the User scheme. That is now subsumed into the User scheme introduced in Python 2.6.
+..  Prior to the User scheme, there was the Home scheme, which is still available, but requires more effort than the User scheme to get packages recognized.
+"virtualenv" is a 3rd-party python package that effectively "clones" a python installation, thereby
+creating an isolated location to intall packages. The evolution of "virtualenv" started before the existence
+scoped to the cloned python install and is used in the normal way. "virtualenv" does offer various features
+that the User installation scheme alone does not provide, e.g. the ability to hide the main python site-packages.