Description
Reading: Chapter 8
Programming:
Submit a single file named hw8.py that contains the solutions to the two problems below. When you are
finished, test your solutions using doctest. Include the following code at the bottom of your module in order
to run the doctest:
if __name__==’__main__’:
import doctest
print( doctest.testfile( ‘hw8TEST.py’))
1. (Composition) Write a Pizza class so that this client code works. Please note that it is ok if
the toppings are listed in a different order.
>>> pie = Pizza()
>>> pie
Pizza(‘M’,set())
>>> pie.setSize(‘L’)
>>> pie.getSize()
‘L’
>>> pie.addTopping(‘pepperoni’)
>>> pie.addTopping(‘anchovies’)
>>> pie.addTopping(‘mushrooms’)
>>> pie
Pizza(‘L’,{‘anchovies’, ‘mushrooms’, ‘pepperoni’})
>>> pie.addTopping(‘pepperoni’)
>>> pie
Pizza(‘L’,{‘anchovies’, ‘mushrooms’, ‘pepperoni’})
>>> pie.removeTopping(‘anchovies’)
>>> pie
Pizza(‘L’,{‘mushrooms’, ‘pepperoni’})
>>> pie.price()
16.65
>>> pie2 = Pizza(‘L’,{‘mushrooms’,’pepperoni’})
>>> pie2
Pizza(‘L’,{‘mushrooms’, ‘pepperoni’})
>>> pie==pie2
True
The Pizza class should have two attributes(data items):
size – a single character str, one of ‘S’,’M’,L”
toppings – a set containing the toppings. If you don’t remember how to use a set, make
sure you look it up in the book. Please note that toppings may be listed in a different order,
but hw2TEST.py takes that into account.
The Pizza class should have the following methods/operators):
__init__ – constructs a Pizza of a given size (defaults to ‘M’) and with a given set of
toppings (defaults to empty set). I highly recommend you look at the Queue class in the
book to see how to get this to work correctly.
setSize – set pizza size to one of ‘S’,’M’or ‘L’
getSize – returns size
addTopping – adds a topping to the pizza, no duplicates, i.e., adding ‘pepperoni’ twice only
adds it once
removeTopping – removes a topping from the pizza
price – returns the price of the pizza according to the following scheme:
‘S’: $6.25 plus 70 cents per topping
‘M’: $9.95 plus $1.45 per topping
‘L’: $12.95 plus $1.85 per topping
__repr__ – returns representation as a string – see output sample above. Note that toppings
may be listed in a different order.
__eq__ – two pizzas are equal if they have the same size and same toppings (toppings don’t
need to be in the same order)
2. Write a function orderPizza that allows the user input to build a pizza. It then prints a thank
you message, the cost of the pizza and then returns the Pizza that was built.
>>> orderPizza()
Welcome to Python Pizza!
What size pizza would you like (S,M,L): M
Type topping to add (or Enter to quit): mushroom
Type topping to add (or Enter to quit): onion
Type topping to add (or Enter to quit): garlic
Type topping to add (or Enter to quit):
Thanks for ordering!
Your pizza costs $14.299999999999999
Pizza(‘M’,{‘mushroom’, ‘onion’, ‘garlic’})
>>> orderPizza()
Welcome to Python Pizza!
What size pizza would you like (S,M,L): L
Type topping to add (or Enter to quit): calamari
Type topping to add (or Enter to quit): garlic
Type topping to add (or Enter to quit):
Thanks for ordering!
Your pizza costs $16.65
Pizza(‘L’,{‘garlic’, ‘calamari’})
>>> p=orderPizza()
Welcome to Python Pizza!
What size pizza would you like (S,M,L): S
Type topping to add (or Enter to quit):
Thanks for ordering!
Your pizza costs $6.25
>>> p
Pizza(‘S’,set())
>>>
