There are numerous part of this video but I try to explain how to install backtrader which I got running on Python.This can also be used in conjunction to build a out a complete algo trading system.  This project clearly is growing quickly to replace Quantopian and maybe Quantstart. It is 100% in Python with some great example Quick Start guides to get you up and running. I am sure the community is up to par by now

http://quantlabs.net/blog/2018/07/overview-of-backtrader-with-python-3-for-a-complete-algo-trading-system/