1. sudo find / -name "virtualenv"

Then I find the executable file path is:

/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/bin/virtualenv

2. Touch a soft link in the or add the path to .bash_profile, I prefer the former:

   sudo ln -s /usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/bin/virtualenv /usr/local/bin/virtualenv
   

1. sudo find / -name "virtualenv"

Then I find the executable file path is:

/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/bin/virtualenv

2. Touch a soft link in the /usr/local/bin/ directory or add the path to .bash_profile, I prefer the former:

   sudo ln -s /usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/bin/virtualenv /usr/local/bin/virtualenv
   

1. sudo find / -name "virtualenv"

Then I find the executable file path is: /usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/bin/virtualenv

2)touch a soft link in the or add the path to .bash_profile, I prefer the former:

sudo ln -s /usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/bin/virtualenv /usr/local/bin/virtualenv

1. sudo find / -name "virtualenv"

Then I find the executable file path is:

/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/bin/virtualenv

2. Touch a soft link in the or add the path to .bash_profile, I prefer the former:

   sudo ln -s /usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/bin/virtualenv /usr/local/bin/virtualenv