notenow the research organization wants that the 'areashould be calculated based on the 'perimetermore specificallythey will provide the 'diameter'then we need to calculate the 'perimeter'then based on the 'perimeter'calculate the 'radiusand finally calculate the 'areabased on this new radius this may look sillybut if we look closelythe radius will change slightly during this conversion processas there will be some difference between (diameter/ and (math pi*diameter)/ *math pithe reason for difference ison computer we do not cancel the math pi at numerator with math pi at denominatorbut solve the numerator first and then divide by the denominatorand hence get some rounding errors wrong solution the solution to this problem may look pretty simplei modify the 'areamethod in the following way 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 multiple constructor below constructor is added for the 'research organizationwho are doing their work based on diameters@classmethod def diameter_init(clsdiameter)radius diameter/ change diameter to radius return cls(radiusreturn radius @staticmethod meter to centimeter conversion (continues on next page micro-managing