Answered: Create a class that models a store. You…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Car Class

Create a class that represents a car. This car object has a brand, a model, a year, mileage, available gas, and a gas efficiency constant. To modify this object create functions that:

checks if the car can travel a given distance
- if the car has 4 gallons and an efficiency of 4 miles per gallon, can it travel 10 miles?
increases the mileage by an amount
updates the consumed fuel by a given mileage
- if I have 10 gallons, an efficiency of 5 miles per gallon, and I traveles 3 miles, how many gallons do I have left?

class Car:

def__init__(self, brand, model, year, mileage, gasInTank, gasEfficiency):

self.brand = brand

self.model = model

self.year = year

self.mileage = mileage

self.gasInTank = gasInTank

self.gasEfficiency = gasEfficiency

defisThereEnoughGas(self, milesToTravel):

maxNoMiles = self.gasInTank * self.gasEfficiency

if milesToTravel > maxNoMiles:

returnFalse

else:

returnTrue

defincreaseMileage(self, miles):

self.mileage = self.mileage + miles

defupdateGasinTank(self, milesTraveled):

gasConsumed = milesTraveled * 1/self.gasEfficiency

self.gasInTank = self.gasInTank - gasConsumed

deftravel(self,milesToTravel):

ifself.isThereEnoughGas(milesToTravel):

self.increaseMileage(milesToTravel)

self.updateGasinTank(milesToTravel)

else:

print('There is not enought has in the tank to make this travel')

deftravelUgly(self,milesToTravel):

maxNoMiles = self.gasInTank * self.gasEfficiency

if milesToTravel > maxNoMiles:

print('There is not enough gas in the tank to make this travel')

else:

self.mileage = self.mileage + milesToTravel

gasConsumed = milesToTravel * 1/self.gasEfficiency

self.gasInTank = self.gasInTank - gasConsumed

# TEST DRIVEN DEVELOPMENT

myCar = Car('Nissan','Rogue',2015,1000,40,12)

'''

TEST 1

With 40 gallons in the tank and 12 miles per gallon, the max miles that can be traveled is 40*12 =480

'''

#output should be True

print('Can my car tavel 100 miles?',myCar.isThereEnoughGas(100))

# output should be False

print('Can my car tavel 100 miles?',myCar.isThereEnoughGas(600))

'''

TEST 2

'''

print('Current mileage:',myCar.mileage)

myCar.increaseMileage(100)

# the result should be 100 more

print('New mileage:',myCar.mileage)

'''

TEST 3

If I travel 24 miles I should have consumed 2 gallons of gas

'''

print('Gas in tank before travel:',myCar.gasInTank)

myCar.updateGasinTank(24)

# the result should be 24 less

print('Gas in tank after travel:',myCar.gasInTank)

'''

TEST 4

'''

print('--------------------------------------------')

myCar = Car('Nissan','Sentra',2015,1000,40,12)

print('Mileage before travel:',myCar.mileage)

print('Gas in tank before travel:',myCar.gasInTank)

myCar.travel(200)

print('Mileage after travel:',myCar.mileage)

print('Gas in tank after travel:',myCar.gasInTank)

'''

TEST 5

'''

print('--------------------------------------------')

myCar = Car('Nissan','Sentra',2015,1000,40,12)

print('Mileage before travel:',myCar.mileage)

print('Gas in tank before travel:',myCar.gasInTank)

myCar.travelUgly(200)

print('Mileage after travel:',myCar.mileage)

print('Gas in tank after travel:',myCar.gasInTank)

output:

Can my car tavel 100 miles? True

Can my car tavel 100 miles? False

Current mileage: 1000

New mileage: 1100

Gas in tank before travel: 40

Gas in tank after travel: 38.0

--------------------------------------------

Mileage before travel: 1000

Gas in tank before travel: 40

Mileage after travel: 1200

Gas in tank after travel: 23.333333333333332

--------------------------------------------

Mileage before travel: 1000

Gas in tank before travel: 40

Mileage after travel: 1200

Gas in tank after travel: 23.333333333333332

NEED HELP HERE:

Store Class

Create a class that models a store. You store has some number of products, for example cookies, chips, soda, and coffee (you get to decided how many products you have). Each product has a price and a stock (that is, how many products you have in the shelf). To modify this object create functions that:

model someone making a purchase, where a purchase is composed of a list of items and the quantity to buy. The function should return the total amount to pay and should update the stock of the products. (As a sugestion (and added challenge) you can model the purchase as a class).S
model a resupply truck that comes to restock your store

WHAT I GOT SO FAR

class Store:

def__int__ (store, milk, cookies, books, coleslaw, staples, blue_paint, franklin_badge, wallet, vcr, eraser):

store.milk = 7

store.cookies = 8

store.books = 12

store.coleslaw = 5

store.staples = 15

store.blue_paint = 30

store.franklin_badge = 2000

store.wallet = 8

store.vcr = 100

store.eraser = 2

defstoreStock(self, )

print('Welcome to the store, please purchase from our great inventory of 10 items')

Expert Solution

Note :

1. Because we only get 2:30 hours to solve, I am unable to explain the code but I have added the comments in code.

These comments will help you to understand the code and its logic.

2. As mentioned, code is about Store class.

3. To save time I have only used cookies, chips, soda, and coffee. You can easily add others by using the copy-paste mechanism.

4. Output screenshots explanation:

A: If stocks are already full, according to that message will get printed.

B: Shows updated stock and our total price.

C: Shows message if we try to purchase out of the stock product.

D: Shows message if we try to give a negative value.

E: Shows invoice.

F: Shows that even if you try to purchase again then stocks are not updated because we haven't refilled our stocks.

At the same time, our invoice gets reset to 0.

G: Shows stocks get reset after refilling the stocks.

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