I'm using the library called psutil to get system/network stats, but I can only get the total uploaded/downloaded bytes on my script. 
What would be the way to natively get the network speed using Python?
The (effective) network speed is simply bytes transferred in a given time interval, divided by the length of the interval.  Obviously there are different ways to aggregate / average the times and they give you different "measures" ... but it all basically boils down to division.
Get upload/download kbps speed