title: Using pip on Windows installed with both python 2.7 and 3.5
body: <p>I am using Windows 10. Currently, I have Python 2.7 installed. I would like to install Python 3.5 as well. However, if I have both 2.7 and 3.5 installed, when I run <code>pip</code>, how do I get the direct the package to be installed to the desired Python version?</p>