HELP ME ...............OBJECT ORIENTED PROGRAMMING Create a class called ShoppingCart

Question

could some one tell me whats wrong with my code especially the function remove_item

class ShoppingCart(object):

def __init__(self,total=0,items = {} ):
self.total = total
self.items = items
def add_item(self,item_name="",quantity =0,price = 0):
self.total += price*quantity
self.items = {item_name:quantity}

def remove_item(self, item_name="", quantity =0, price=0):
self.total -= price*quantity
if self.items[item_name] <= quantity:
del self.items
else:
self.items[item_name] -= quantity
def checkout(self,cash_paid):
balance = 0
if cash_paid < self.total:
return "Cash Paid Not Enough"
else:
balance = cash_paid -self.total
return balance

class Shop(ShoppingCart):

def __init__(self,quantity=100):
self.quantity = quantity

def remove_item(self):
self.quantity -= 1

Answer 1

What's the problem exactly? I tried this code in the playground and it ran without errors.

Answer 2

you have the same post:
https://www.sololearn.com/discuss/299014/?ref=app

Answer 3

We can help you better, if you present your code.
Sugestion: Post your code in the Code Playground. Then come back and tell us its name.

Answer 4

checkout my test with your code: (I comented the points I changed and why)

https://code.sololearn.com/cm1Si2NfqrwS/?ref=app

Answer 5

thank you Cruz wel it passed all the tests but am getting this error i really wonder why
THERE IS AN ERROR/BUG IN YOUR CODE

Here is the relevant part of the stack trace:

KeyError('Mango',),

Answer 6

the problem is on the checkout method i get this error

1 . test_checkout_returns_correct_balance
Failure in line 35, in test_checkout_returns_correct_balance self.assertEqual(self.cart.checkout(25), 'Cash paid not enough', msg='Balance of checkout not correct') AssertionError: Balance of checkout not correc

after the unitest

import unittest

class ShoppingCartTestCases(unittest.TestCase):
def setUp(self):
self.cart = ShoppingCart()
self.shop = Shop()

def test_cart_property_initialization(self):
self.assertEqual(self.cart.total, 0, msg='Initial value of total not correct')
self.assertIsInstance(self.cart.items, dict, msg='Items is not a dictionary')

def test_add_item(self):
self.cart.add_item('Mango', 3, 10)

self.assertEqual(self.cart.total, 30, msg='Cart total not correct after adding items')
self.assertEqual(self.cart.items['Mango'], 3, msg='Quantity of items not correct after adding item')

def test_remove_item(self):
self.cart.add_item('Mango', 3, 10)
self.cart.remove_item('Mango', 2, 10)

self.assertEqual(self.cart.total, 10, msg='Cart total not correct after removing item')
self.assertEqual(self.cart.items['Mango'], 1, msg='Quantity of items not correct after removing item')

def test_checkout_returns_correct_balance(self):
self.cart.add_item('Mango', 3, 10)
self.cart.add_item('Orange', 16, 10)

self.assertEqual(self.cart.checkout(265), 75, msg='Balance of checkout not correct')
self.assertEqual(self.cart.checkout(25), 'Cash paid not enough', msg='Balance of checkout not correct')

def test_shop_is_instance_of_shopping_cart(self):
self.assertTrue(isinstance(self.shop, ShoppingCart), msg='Shop is not a subclass of ShoppingCart')

def test_shop_remove_item_method(self):
for i in range(15):
self.shop.remove_item()

self.assertEqual(self.shop.quantity, 85)