Create app.py

app.py

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+import gradio as gr
+
+# -----------------------------
+# Inventory Data
+# -----------------------------
+inventory = [
+    (101, "Hammer", 120),
+    (102, "Screwdriver Set", 350),
+    (103, "Drill Machine", 2500),
+    (104, "Pliers", 180),
+    (105, "Wrench", 220)
+]
+
+# Convert inventory into dictionary for quick lookup
+inventory_dict = {item[0]: {"name": item[1], "price": item[2]} for item in inventory}
+
+# Cart
+my_cart = []
+
+# -----------------------------
+# Functions
+# -----------------------------
+
+def add_to_cart(item_id):
+    if item_id is None:
+        return my_cart, "Please select an item"
+
+    item = inventory_dict[item_id]
+    my_cart.append(item)
+
+    return my_cart, f"{item['name']} added to cart"
+
+def remove_from_cart(index):
+    if index is None or index >= len(my_cart):
+        return my_cart, "Invalid selection"
+
+    removed_item = my_cart.pop(index)
+    return my_cart, f"{removed_item['name']} removed from cart"
+
+def display_cart():
+    if not my_cart:
+        return "Cart is empty"
+
+    cart_text = ""
+    for i, item in enumerate(my_cart):
+        cart_text += f"{i}. {item['name']} - ${item['price']}\n"
+
+    return cart_text
+
+def calculate_total():
+    total = sum(item["price"] for item in my_cart)
+    return f"Total Bill: ${total}"
+
+# -----------------------------
+# Gradio Interface
+# -----------------------------
+
+with gr.Blocks() as demo:
+    gr.Markdown("# 🧾 Hardware Store Billing System")
+
+    # Dropdown to select inventory item
+    item_dropdown = gr.Dropdown(
+        choices=[(f"{item[1]} (${item[2]})", item[0]) for item in inventory],
+        label="Select Item from Inventory"
+    )
+
+    add_button = gr.Button("Add to Cart")
+
+    # Dropdown for cart items (by index)
+    remove_dropdown = gr.Dropdown(label="Select Cart Item Index to Remove")
+    remove_button = gr.Button("Remove from Cart")
+
+    cart_display = gr.Textbox(label="Cart Contents", lines=8)
+    total_output = gr.Textbox(label="Total Bill")
+    status_output = gr.Textbox(label="Status")
+
+    # -----------------------------
+    # Event Handlers
+    # -----------------------------
+
+    def update_remove_dropdown(cart):
+        return gr.Dropdown(
+            choices=[(f"{i}: {item['name']}", i) for i, item in enumerate(cart)]
+        )
+
+    add_button.click(
+        add_to_cart,
+        inputs=item_dropdown,
+        outputs=[remove_dropdown, status_output]
+    ).then(display_cart, outputs=cart_display).then(update_remove_dropdown, inputs=remove_dropdown, outputs=remove_dropdown)
+
+    remove_button.click(
+        remove_from_cart,
+        inputs=remove_dropdown,
+        outputs=[remove_dropdown, status_output]
+    ).then(display_cart, outputs=cart_display).then(update_remove_dropdo