% pyenv versions
  system
  2.7.6
% pyenv virtualenv 2.7.6 test-env
% pyenv virtualenvs
  * test-env (created from $PYENV_ROOT/versions/2.7.6)
% pyenv activate test-env
% pyenv version
  * test-env (set by $PYENV_ROOT/versions/2.7.6)
% pyenv uninstall test-env
% pyenv virtualenvs
% pyenv versions
% pip install nose
% pip list
  nose (x.x.x)
% pip freeze > pip.list
% cat pip.list
  argparse==1.2.1
  configobj==5.0.6
  coverage==3.7.1
  logging==0.4.9.6
  mysql-connector-python==2.0.1
  nose==1.3.4
  six==1.8.0
  unittest-xml-reporting==1.9.2
  wsgiref==0.1.2
% pip install -r pip.list
% pip uninstall nose
% pip list
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