__dict__ {'date''''metal''copper''radius' 'price' 'quantity' 'center' shipping product and agile methodology in previous sectionwe create the object of the class in the python shell nowwe will create object of the class in the file itselfas show belowimportantnote thatat this momentwe did not add to many features to class in listing we added only two methods here 'areaand 'costnowwe are ready to ship this product to our customers we will add more features according to feedback provided by the costumers as shown in subsequent sections this is called the 'agilemethodology this will give us chance to understand the psychology behind the several elements of the python language listing shipping product is ready pythonic py import math import time class ring(object)""here we will see the actual logic behind various pieces of python language instancesvariablesmethod and @property etc alsowe will see the combine usage of these pieces to complete design with agile methodology ""class variables date time strftime("% -% -% "time gmtime()today' date "yyyy-mm-ddcenter center of the ring def __init__(selfdate=datemetal="copper"radius= price= quantity= )""init is not the constructorbut the initializer which initialize the instance variable self is the instance __init__ takes the instance 'selfand populates it with the radiusmetaldate etc and store in dictionary self radiusself metal etc are the instance variable which must be unique ""self date date self metal metal self radius radius self price price self quantity quantity def cost(self)return self price self quantity (continues on next page shipping product and agile methodology