Equivalent of “Effective Python” no where to be found

Maybe I just haven’t found the correct place to look, but I couldn’t find all of the info I was looking for on Python metaclasses all in one place. I ended up referencing:

the last chapter of the Python Cookbook
the wikipedia entry for Metaclasses
Unifying types and classes in Python 2.2
A Primer on Python Metaclass Programming
the [...]