Answer:
class ShoppingCart:
def __init__(self):
self.products = {}
def add_product(self, product_id, quantity):
if product_id in self.products:
self.products[product_id] += quantity
else:
self.products[product_id] = quantity
def remove_product(self, product_id, quantity=None):
if product_id in self.products:
if quantity is None or self.products[product_id] <= quantity:
del self.products[product_id]
else:
self.products[product_id] -= quantity
def update_quantity(self, product_id, quantity):
if product_id in self.products:
self.products[product_id] = quantity
def view_cart(self):
for product_id, quantity in self.products.items():
# Display product details (name, price, etc.) based on the product_id
print(f"Product ID: {product_id}, Quantity: {quantity}")
def apply_discount(self, discount_amount):
# Apply the given discount amount to the total cost of the items in the cart
pass
def calculate_total(self):
total = 0
for product_id, quantity in self.products.items():
# Calculate the total cost of the products based on their individual prices
# Add any applicable taxes or shipping charges
# Consider any discounts or coupons applied
total += quantity * get_product_price(product_id)
return total
def checkout(self):
# Handle the checkout process, including collecting user information, payment details, etc.
pass
def empty_cart(self):
self.products = {}
# Example usage:
cart = ShoppingCart()
# Add products to the cart
cart.add_product('p1', 2)
cart.add_product('p2', 1)
# Update the quantity of a product
cart.update_quantity('p1', 3)
# View the cart contents
cart.view_cart()
# Remove a product from the cart
cart.remove_product('p2')
# Calculate the total cost
total_cost = cart.calculate_total()
print(f"Total Cost: {total_cost}")
# Proceed to checkout
cart.checkout()
# Empty the cart
cart.empty_cart()