Question

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

class Pizza:
def __init__(self, s = 'M', t = []):
self.setSize(s)
self.toppings = t

def setSize(self, s):
self.size = s

def getSize(self):
return self.size
  
def addTopping(self, t):
self.toppings.add(t)

def removeTopping(self, t):
self.toppings.remove(t)

def price(self):
if self.size == 'S':
return 6.25 + (0.7 * len(self.toppings))
elif self.size == 'S':
return 9.95 + (1.45 * len(self.toppings))
else:
return 12.95 + (1.85 * len(self.toppings))

def __repr__(self):
ret = 'Pizza('
ret += ('\'' + self.size + '\'')
ret += ','
ret += str(self.toppings)
ret += ')'
return ret

def __eq__(self, other):
return self.size == other.size and (self.toppings - other.toppings == set())

How do I make sure the list for toppings gets cleared for new pizza. Doc test shows me failing by keeping toppings from prior pizza...?

Answer 1

Implemented in python

Note: I actually solved this problem prior

code:

class Pizza():
def __init__(self, size = 'M', toppings = set()):
self.s = size
self.t = set(toppings)

def __repr__(self):
return("Pizza('{}',{})".format(self.s, self.t))

def setSize(self, size):
self.s = size

def getSize(self):
return self.s

def addTopping(self, toppings):
self.t.add(toppings)

def removeTopping(self, toppings):
self.t.remove(toppings)

def price(self):
if self.s == 'S':
return(6.25 + (len(self.t) * 0.70))
elif self.s == 'M':
return(9.95 + (len(self.t) * 1.45))
elif self.s == 'L':
return(12.95 + (len(self.t) * 1.85))

def __eq__(self, other):
return self.s == other.s and set(self.t) == set(other.t)

def orderPizza():
pie = Pizza()
print("Welcome to Python Pizza!")

size = str(input("What size pizza would you like (S,M,L): "))
pie.setSize(size)

while True:
topping = str(input("Type topping to add (or Enter to quit): "))
pie.addTopping(topping)
if topping == '':
pie.removeTopping('')
break

print("Thanks for ordering!")
print("Your pizza costs ${}".format(pie.price()))
return pie

if __name__=='__main__':
import doctest
print(doctest.testfile( 'test.py'))

#Note:Replace the doctest file with your file.

Code Screenshots: