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app (4).py

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+
+import gradio as gr
+import pandas as pd
+
+# ---------- Inventory ----------
+# ID -> (Name, Price per KG)
+INVENTORY = {
+    1: ("Apples", 250),
+    2: ("Cherry", 650),
+    3: ("Chickoo", 50),
+    4: ("Grapes", 90),
+    5: ("Mangoes", 150),
+}
+
+def inventory_markdown():
+    items = "\n".join([f"({pid}) **{name}**, {price}"
+                        for pid, (name, price) in INVENTORY.items()])
+    return f"### Inventory\n{items}"
+
+# ---------- Cart helpers ----------
+def summarize_cart(cart):
+    """Return (DataFrame, total_cost) for the cart.
+    Cart structure: list of dicts with keys: id, name, unit_price, qty
+    """
+    if not cart:
+        return pd.DataFrame(columns=["Index","Name","Quantity","Price Per KG"]), 0
+    rows = []
+    total = 0
+    for idx, item in enumerate(cart):
+        rows.append({
+            "Index": idx,
+            "Name": item["name"],
+            "Quantity": item["qty"],
+            "Price Per KG": f"${item['unit_price']:.2f}",
+        })
+        total += item["qty"] * item["unit_price"]
+    df = pd.DataFrame(rows)
+    return df, total
+
+def add_item_to_cart(pid, cart):
+    add_msg = ""
+    if pid is None:
+        return *summarize_cart(cart), add_msg, ""
+    if pid not in INVENTORY:
+        add_msg = f":warning: Invalid ID {pid}. Please use one of: {list(INVENTORY.keys())}"
+        return *summarize_cart(cart), add_msg, ""
+    name, price = INVENTORY[pid]
+    # Check if already in cart -> increment quantity
+    for item in cart:
+        if item["id"] == pid:
+            item["qty"] += 1
+            df, total = summarize_cart(cart)
+            add_msg = f">>>>>>>>>> The item '{name}' has been added to the cart. <<<<<<<<<<"
+            return df, total, add_msg, ""
+    # Otherwise append new
+    cart.append({"id": pid, "name": name, "unit_price": float(price), "qty": 1})
+    df, total = summarize_cart(cart)
+    add_msg = f">>>>>>>>>> The item '{name}' has been added to the cart. <<<<<<<<<<"
+    return df, total, add_msg, ""
+
+def remove_item_from_cart(index, cart):
+    rm_msg = ""
+    if index is None:
+        return *summarize_cart(cart), "", rm_msg
+    if not cart:
+        rm_msg = ":warning: Cart is empty."
+        return *summarize_cart(cart), "", rm_msg
+    if index < 0 or index >= len(cart):
+        rm_msg = f":warning: Invalid index {index}. Must be 0..{max(0,len(cart)-1)}"
+        return *summarize_cart(cart), "", rm_msg
+    removed = cart.pop(index)
+    df, total = summarize_cart(cart)
+    rm_msg = f"Removed '{removed['name']}' from the cart."
+    return df, total, "", rm_msg
+
+with gr.Blocks(title="Fruit Shopping Cart System") as demo:
+    gr.Markdown("## Fruit Shopping Cart System")
+
+    # App state: the cart
+    cart_state = gr.State([])
+
+    with gr.Row():
+        with gr.Column(scale=2):
+            pid_in = gr.Number(label="Enter Product ID to Add to Cart", value=2, precision=0)
+        with gr.Column(scale=2):
+            rm_index_in = gr.Number(label="Enter Index ID to Remove from Cart", value=0, precision=0)
+        with gr.Column(scale=1):
+            add_btn = gr.Button("Add to Cart", variant="primary")
+        with gr.Column(scale=1):
+            rm_btn = gr.Button("Remove from Cart", variant="secondary")
+
+    with gr.Row():
+        with gr.Column(scale=3):
+            gr.Markdown("### Your Cart\n_Use 0-based index for removal_ :shopping_trolley:")
+            cart_df = gr.Dataframe(headers=["Index","Name","Quantity","Price Per KG"],
+                                   interactive=False,
+                                   wrap=True,
+                                   height=220)
+            add_msg_out = gr.Textbox(label="Add Item Message", interactive=False)
+            rm_msg_out = gr.Textbox(label="Remove Item Message", interactive=False)
+            total_cost_out = gr.Textbox(label="Total Cost", interactive=False)
+        with gr.Column(scale=2):
+            inv_md = gr.Markdown(inventory_markdown())
+            gr.Markdown("""
+### Business Requirements
+1. **Add Products to the Shopping Cart**: Add by ID from the inventory; quantities aggregate automatically.  
+2. **Remove Unwanted Items**: Remove by 0-based index shown in the cart table.  
+3. **Calculate the Total Bill**: Total updates automatically after each action.
+""")
+
+    def handle_add(pid, cart):
+        df, total, add_msg, rm_msg = add_item_to_cart(int(pid), cart)
+        total_str = f"$ {total:,.2f}"
+        return df, add_msg, rm_msg, total_str, cart
+
+    def handle_remove(index, cart):
+        df, total, add_msg, rm_msg = remove_item_from_cart(int(index), cart)
+        total_str = f"$ {total:,.2f}"
+        return df, add_msg, rm_msg, total_str, cart
+
+    add_btn.click(
+        handle_add,
+        inputs=[pid_in, cart_state],
+        outputs=[cart_df, add_msg_out, rm_msg_out, total_cost_out, cart_state]
+    )
+
+    rm_btn.click(
+        handle_remove,
+        inputs=[rm_index_in, cart_state],
+        outputs=[cart_df, add_msg_out, rm_msg_out, total_cost_out, cart_state]
+    )
+
+if __name__ == "__main__":
+    demo.launch()

requirements (8).txt

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+gradio>=4.31.0
+pandas>=2.0.0