Python descriptors made simple – SmallSureThing

old-style and new-style classes in Python 2.7? – Stack Overflow

What is the difference between old style and new style classes in Python? – Stack Overflow

What is the difference between old style and new style classes in Python? – Stack Overflow

How can I intercept calls to python’s “magic” methods in new style classes? – Stack Overflow

The History of Python: The Inside Story on New-Style Classes

eol – When do I use the PHP constant “PHP_EOL”? – Stack Overflow