It's Pythons all the way down

Python types & metaclasses made simple. (Har har)

References

• The Python Data Model describes pretty much everything, in great detail.
• Understanding Python Metaclasses was hugely useful, especially highlighting some important but subtle details.
• Change Python MRO at Runtime taught me an awesome hack for dynamically changing the MRO of a class.
• The abc Module Docs describes a custom metaclass in the core library.
• The Descriptor HowTo describes how descriptors work in a prosaic style.