Upgrade Python 2.7 virtualenv under Homebrew

upgrade.sh

#!/bin/bash

if [ $# -ne 1 ]; then
    echo "Usage: $0 <venv_dir>"
else
    rm $1/bin/pip
    rm $1/bin/pip2
    rm $1/bin/pip2.7
    rm $1/bin/python
    rm $1/bin/python2
    rm $1/bin/python2.7
    rm -r $1/include/python2.7
    rm $1/lib/python2.7/*
    rm -r $1/lib/python2.7/distutils
    rm $1/lib/python2.7/site-packages/easy_install.*
    rm -r $1/lib/python2.7/site-packages/pip
    rm -r $1/lib/python2.7/site-packages/pip-*.dist-info
    rm -r $1/lib/python2.7/site-packages/setuptools
    rm -r $1/lib/python2.7/site-packages/setuptools-*.dist-info
    rm $1/.Python

    virtualenv $1
fi