How to include libraries through the python local server
The SimpleHTTPServer module will only serve things that are within the directory you're telling it to serve and folders beneath that directory, for security reasons. (Otherwise a visitor could ask it for e.g. ../../../../etc/passwd or similar.)
If you want to serve scripts and other assets, you'll need to put them in a subfolder of the directory you're running SimpleHTTPServer in.
I'm currently running an html and jsp file locally and hosting it by running this command through the terminal: python -m SimpleHTTPServer 8888 &.
This has been going smoothly, but I recently ran into an issue where I have to include library files (d3, jQuery, ajax, etc.)
I've included the following command in my html file <script src="../libs/d3.v3.min.js"> 
but noticed that it was pulling up a 404 error.  I've tried to remedy it with a change in script to : <script src="http://d3js.org/d3.v3.min.js">.
But I actually feel that it doesn't go to the root of the problem.  Why am I unable to include the files I have in my lib?  
Edited wording to question thanks for the heads up Amber:  The lib file is located one directory up from the html file.