Create app.py

app.py

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+import gradio as gr
+
+# ---------- Data ----------
+inventory = [
+    (101, "Hammer", 120),
+    (102, "Screwdriver Set", 350),
+    (103, "Drill Machine", 2500),
+    (104, "Pliers", 180),
+    (105, "Wrench", 220)
+]
+
+# Global cart
+cart = []
+
+# ---------- Helper Functions ----------
+def add_tool(tool_name):
+    for item in inventory:
+        if item[1] == tool_name:
+            cart.append(item)
+            break
+    return display_cart(), f"✅ Added {tool_name} to cart."
+
+def remove_tool(tool_name):
+    global cart
+    for item in cart:
+        if item[1] == tool_name:
+            cart.remove(item)
+            break
+    return display_cart(), f"🗑️ Removed {tool_name} from cart."
+
+def display_cart():
+    if not cart:
+        return "Cart is empty."
+    cart_display = "\n".join([f"{t[1]} - ${t[2]}" for t in cart])
+    return cart_display
+
+def calculate_total():
+    total = sum([t[2] for t in cart])
+    return f"💰 Total Bill: ${total}"
+
+# ---------- Interface Components ----------
+tool_names = [item[1] for item in inventory]
+
+with gr.Blocks() as demo:
+    gr.Markdown("## 🧰 Hardware Store Billing System\nAdd or remove tools and calculate your total.")
+
+    with gr.Row():
+        tool_dropdown = gr.Dropdown(tool_names, label="Select Tool to Add", interactive=True)
+        add_btn = gr.Button("Add Tool")
+
+    with gr.Row():
+        remove_dropdown = gr.Dropdown(tool_names, label="Select Tool to Remove", interactive=True)
+        remove_btn = gr.Button("Remove Tool")
+
+    cart_box = gr.Textbox(label="🛒 Cart Contents", lines=6)
+    total_btn = gr.Button("Calculate Total")
+    result_box = gr.Textbox(label="💵 Result", interactive=False)
+
+    add_btn.click(add_tool, inputs=tool_dropdown, outputs=[cart_box, result_box])
+    remove_btn.click(remove_tool, inputs=remove_dropdown, outputs=[cart_box, result_box])
+    total_btn.click(calculate_total, outputs=result_box)
+
+demo.launch()