Use the flag -p with virtualenv command to specify the python version that you would want to use $ virtualenv -p /usr/bin/python/2.7 For windows environment, use c:\> virtualenv --python=c:\Python27\python.exe myenv

Different projects in python may require different modules and its dependencies. Also, there may be a necessity that certain projects be run on newer/older python releases hence introducing version conflicts. Virtual environment is a tool that helps you manage these scenarios. To install virtualenv, use pip $ pip install virtualenv Now, create a virtual environment "myenv" $ virtualenv myenv To use the virtual environment, key in $ source myenv/bin/activate (if in windows, key in "myenv\Scripts\activate") The name of your virtual environment will appear on the left of the prompt (myenv) ...$ To exit out of the virtual environment, key in $ deactivate