Test __getattribute__ and descriptor __set__

getattribute_and_set_descriptor.py

class MyDescriptor(object):
	def __init__(self, name, val):
		self.name = name
		self.theVal = val

	def __get__(self, instance, owner):
		print "Getting {} from {} (owner: {})".format(self.name, instance, owner)
		return self.theVal

	def __set__(self, instance, val):
		print "Setting {} from {} to {!r}".format(self.name, instance, val)
		self.theVal = val

class TestClass(object):
	def __repr__(self):
		return "TestClass<{}>".format(id(self))
	def __getattribute__(self, item):
		print "TestClass.__getattribute__: {!r}".format(item)
		return object.__getattribute__(self, item)

	foo = MyDescriptor("foo", 3)

myObj = TestClass()
print "-- myObj.foo = 7 --"
myObj.foo = 7
print "-- myObj.foo --"
print myObj.foo