descriptors.py

#! /usr/bin/env python
"""
"Descriptors look weird. They're attached to the class and the methods
have a funky signature."

This is from a talk given by a hacker at twitter
This is for python 3 world

"""
class MyDescriptor(object):
    def __get__(self, obj, type):
        print self, obj, type
    def __set__(self, obj, val):
        print "Got %s" % val

class Myclass(object):
    x = MyDescriptor()  # Attached at class definition time!