我正在开发一个有 5 个选项的购物车，但我很难选择选项 3 来删除（弹出）一个项目。 现在，即使我向列表中添加了更多项目，它也只显示一项。我需要它向我显示所有项目，然后我可以输入一项的编号，然后将其弹出（未删除）。我但在一个无效的数字中，那么它应该循环并再次询问我，但在正确的数字中。
你如何通过代码看出我尝试了一些不同的事情。我输入了 whoöe 代码，因为我在选项 3 之外犯了错误
#shopping cart with the 5 options
items = []
prices = []
ite_pri = items + prices
index = 0
name = None
cost = 0
print('Welcome to the Shopping Cart Program!')
while name != 'quit':
print()
print('Please select one of the following: ')
print('1. Add item \n2. View cart \n3. Remove item \n4. Compute Total \n5. Quit')
option = input ('Please enter an action: ')
#1. option is to add a item stored in list items and prices, aks how for price and new: how many
if option == '1':
name = input('What item would you like to add? ')
cost = input(f"What is the price of '{name}'? ")
quantity = input(f"How many '{name}'? ")
print(f"'{name}' has been added to the cart. ")
items.append(name)
prices.append(float(cost) * int(quantity))
# 2. option is to show cart
elif option == '2':
print()
print('The content of the shopping cart are:')
for i in range(len(items)):
name = items[i]
cost = prices[i]
print(f'{i+1}.{name} - ${cost}')
# 3. option is to remove (pop) an item
# it only shows one item and befor that it poped the wrong item (when i press 2 it poped the 3. item)
elif option == '3':
print()
print('The content of the shopping cart are:')
for i in range(len(items)):
name = items[i]
cost = prices[i]
print(f'{i+1}.{name} - ${cost}')
pop_index = int(input('Which item would you like to remove? '))
if index == pop_index:
items.pop(int(pop_index))
break
print('Item removed.')
# how can i make it that if user tips in an invalit number that this print comes and he has to but in a new number
print('sorry, that is not a valid item number.')
# 4. option is to show total
elif option == '4':
running_total = 0
for total in prices:
running_total += float(total)
print(f'The total price of the items in the shopping cart is: {running_total:.2f}')
# 5. option is to stop the progress
elif option == '5':
print('Thank you. Goodbye.')
#name != 'quit'
break
为购物商品创建一个类，并将它们存储在 ShoppingItem 对象的购物车数组中，而不是使用 2 个数组。这个重构的代码应该可以解决您的问题
class ShoppingItem:
def __init__(self, name, price, quantity):
self.name = name
self.price = float(price)
self.quantity = int(quantity)
def total_price(self):
return self.price * self.quantity
def __str__(self):
return f"{self.name} - ${self.price:.2f} x {self.quantity} = ${self.total_price():.2f}"
class ShoppingCart:
def __init__(self):
self.items = []
def add_item(self, name, price, quantity):
self.items.append(ShoppingItem(name, price, quantity))
print(f"'{name}' has been added to the cart.")
def view_cart(self):
if not self.items:
print("Your cart is empty.")
else:
print("\nThe contents of the shopping cart are:")
for i, item in enumerate(self.items, 1):
print(f"{i}. {item}")
def remove_item(self, index):
if 0 <= index < len(self.items):
removed_item = self.items.pop(index)
print(f"Removed '{removed_item.name}' from the cart.")
else:
print("Sorry, that is not a valid item number.")
def compute_total(self):
total = sum(item.total_price() for item in self.items)
print(f"\nThe total price of the items in the shopping cart is: ${total:.2f}")
def is_empty(self):
return len(self.items) == 0
def main():
cart = ShoppingCart()
print('Welcome to the Shopping Cart Program!')
while True:
print()
print('Please select one of the following:')
print('1. Add item \n2. View cart \n3. Remove item \n4. Compute Total \n5. Quit')
option = input('Please enter an action: ')
# 1. Add item
if option == '1':
name = input('What item would you like to add? ')
price = input(f"What is the price of '{name}'? ")
quantity = input(f"How many '{name}'? ")
cart.add_item(name, price, quantity)
# 2. View cart
elif option == '2':
cart.view_cart()
# 3. Remove item
elif option == '3':
if cart.is_empty():
print("Your cart is empty. Nothing to remove.")
else:
cart.view_cart()
try:
pop_index = int(input('Which item would you like to remove? ')) - 1
cart.remove_item(pop_index)
except ValueError:
print("Invalid input. Please enter a valid item number.")
# 4. Compute total
elif option == '4':
cart.compute_total()
# 5. Quit
elif option == '5':
print('Thank you. Goodbye.')
break
else:
print("Invalid option. Please select a valid action.")
if __name__ == "__main__":
main()