NL Can is a local can-making company that makes cans using an eco-friendly material. Recently a number of new eco-friendly paint companies have started up in the area and they have been placing large orders for paint cans in which to put their eco-friendly paint. NL Can has asked you to design, implement and test a Python class, CanOrder, to generate order objects for cans with the following attributes (instance variables) and class variables
NL Can is a local can-making company that makes cans using an eco-friendly material. Recently a number of new eco-friendly paint companies have started up in the area and they have been placing large orders for paint cans in which to put their eco-friendly paint. NL Can has asked you to design, implement and test a Python class, CanOrder, to generate order objects for cans with the following attributes (instance variables) and class variables.
Class variables:
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NoOfOrders is a class variable that keeps track of the number of orders created (initially 0); NoOfOrders automatically increments with each new object created, i.e., when the first object is created, NoOfOrders should become 1, when the second object is created, NoOfOrders should change to 2, etc.
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NextOrderNoisaclassvariable,initializedto100,whichisusedtogeneratetheorderIDnumberfor each order as a sequence of even numbers, starting with 100; i.e., the first order would have an orderID of 100, the second order created would have an orderID of 102, etc.
Instance variables:
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orderID is a unique number identifying the can order and is set using the NextOrderNo class variable
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quantityOrderedisthenumberofcansordered(defaultvalue0)
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radiusistheradiusofthecanininches(defaultvalue0.0)
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heightistheheightofthecanininches(defaultvalue0.0)
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handleisaTrue/Falsevalueindicatingifthecansintheordershouldhaveahandle(True)ornot(False) (default value False)
Also include the following methods:
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a constructor method for the CanOrder class with default values for all 4 parameters (not including the self parameter)
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three accessor methods, one to retrieve the ID of the order, one for the radius, and one for the height
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two mutator methods, one to change the radius of the can, and one to change the height of the can
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a method called getTotalSurfaceArea to compute and return the total surface area of all cans
ordered; the formula for the surface area of a can is: 2πr 2 + 2πrh (note: use the math library to get the
constant variable pi and the pow function)
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a method called getTotalCost to compute and return the total cost of the order, where the cost of the
material used is half of a cent ($0.005) per square centimetre of surface area and if handles are required,
then an extra fifty cents ($0.50) is added for each can
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the special __str__() method to print the information about the order including the orderID, the radius
and the height of the can, the quantity ordered, the handle option (True/False), the total surface area of material used for the quantity of cans ordered, and the total cost of the order with appropriate descriptive labels, as shown in the sample output
Also include a main function to test the defined class as follows:
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create 2 CanOrder objects
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print information about each order using the special __str__() method
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change the height of the can in the second order and print the order ID, the updated height and the
updated total cost of the order with appropriate descriptive labels
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print the total number of orders with an appropriate descriptive label
• print the total cost of all the orders (both orders, including the effect of the changed height of the second order), with an appropriate descriptive label
Call the file containing your class and main function, nl_cans.py.
Sample input/output:
Order ID: 100 Can Radius: 5 cm Can Height: 10 cm Quantity Ordered: 100 cans Handle Needed? False Total Surface Area: 47123.89 sq.cm. Total Cost: $235.62 Order ID: 102 Can Radius: 7.5 cm Can Height: 20 cm Quantity Ordered: 300 cans Handle Needed? True Total Surface Area: 388772.09 sq.cm. Total Cost: $2093.86 The height of cans for Order ID 102 has been changed to 21.00. The new cost of for Order ID 102 is $2164.55. The total number of orders received was 2. The total cost of all orders received was $2400.17.
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