Where is the Python documentation for the special methods? (__init__, __new__, __len__, …)

Question

Where is a complete list of the special double-underscore/dunder methods that can be used in classes? (e.g., __init__, __new__, __len__

Answer 1

For somebody who is relatively new to Python, and for whom the documentation is often not quite accessible enough (like myself): somebody wrote a nice introduction with lots of examples on how the special (magic) methods work, how to use them, etc.