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import gradio as gr
# --- Data Structures ---
Inventory = [
("Apples", 250),
("Cherry", 650),
("Chickoo", 50),
("Oranges", 80),
("Mangoes", 150),
]
# Create a price lookup dictionary for convenience.
price_dict = {name: price for name, price in Inventory}
def format_cart(cart):
"""Return a formatted string of the cart contents and total bill."""
if not cart:
return "Your cart is empty."
summary = ""
total = 0
for i, (product, quantity) in enumerate(cart):
price = price_dict[product]
subtotal = price * quantity
summary += f"{i+1}. **{product}** x {quantity} @ {price} each = {subtotal}\n"
total += subtotal
summary += f"\n**Total Bill:** {total}"
return summary
def generate_remove_options(cart):
"""Generate options for the removal dropdown from the cart list."""
options = []
for i, (product, quantity) in enumerate(cart):
price = price_dict[product]
subtotal = price * quantity
options.append(f"{i}: {product} x {quantity} (Subtotal: {subtotal})")
return options
def add_to_cart(product, quantity, cart):
"""
Add the selected product and quantity to the cart.
Returns the updated cart state, a message, the cart summary,
and updated removal dropdown options.
"""
# Ensure the cart exists.
if cart is None:
cart = []
cart.append((product, int(quantity)))
message = f"Added {int(quantity)} **{product}**(s) to your cart!"
summary = format_cart(cart)
remove_options = generate_remove_options(cart)
# Use gr.Dropdown.update to update the choices for removal.
return cart, message, summary, gr.Dropdown.update(choices=remove_options)
def remove_from_cart(selected_option, cart):
"""
Remove the selected item from the cart.
Returns the updated cart state, a message, the cart summary,
and updated removal dropdown options.
"""
if not cart:
message = "Cart is empty."
return cart, message, format_cart(cart), gr.Dropdown.update(choices=[])
# Extract the index from the selected option.
index = int(selected_option.split(":")[0])
removed_item = cart.pop(index)
message = f"Removed {removed_item[1]} **{removed_item[0]}**(s) from your cart."
summary = format_cart(cart)
remove_options = generate_remove_options(cart)
return cart, message, summary, gr.Dropdown.update(choices=remove_options)
# --- Build the Gradio Interface ---
with gr.Blocks() as demo:
# Initialize an empty cart in state.
cart_state = gr.State([])
gr.Markdown("# Gradio Shopping Cart")
with gr.Row():
product_input = gr.Dropdown(
label="Select Product",
choices=[name for name, _ in Inventory],
value=Inventory[0][0]
)
quantity_input = gr.Number(
label="Quantity",
value=1,
precision=0
)
add_button = gr.Button("Add to Cart")
add_message = gr.Markdown("") # To display add-to-cart messages.
cart_display = gr.Textbox(
label="Cart Summary",
interactive=False,
lines=10,
value="Your cart is empty."
)
gr.Markdown("## Remove Items from Cart")
with gr.Row():
remove_dropdown = gr.Dropdown(
label="Select Item to Remove",
choices=[] # Updated dynamically after adding items.
)
remove_button = gr.Button("Remove Selected Item")
remove_message = gr.Markdown("") # To display removal messages.
# Set up interactions:
add_button.click(
fn=add_to_cart,
inputs=[product_input, quantity_input, cart_state],
outputs=[cart_state, add_message, cart_display, remove_dropdown]
)
remove_button.click(
fn=remove_from_cart,
inputs=[remove_dropdown, cart_state],
outputs=[cart_state, remove_message, cart_display, remove_dropdown]
)
demo.launch()
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