issue of example1.py of chapter 8

[zangetsudo]

hi, David

i have just tested
python-cookbook/src/8/lazily_computed_attributes/example1.py
but happened to findout it does not workout like what the book tell, which i meam python cookbook, 3rd.
After a little research, i found that you need to put a object there, like this :
class lazyproperty(object):
but i dont konw why.
please tell me if you know.

PS:

TEST based on

PyCharm 2016.3.1
Build #PY-163.9735.8, built on December 15, 2016
Subscription is active until February 25, 2017
JRE: 1.8.0_111-b14 amd64
JVM: Java HotSpot(TM) 64-Bit Server VM by Oracle Corporation

Python
2.7.11 (v2.7.11:6d1b6a68f775, Dec 5 2015, 20:40:30) [MSC v.1500 64 bit (AMD64)] on win32

[dabeaz]

The cookbook is written for Python 3. If using Python 2, you'll need to use new-style classes (i.e., inherit from object as you've noted).