Create app.py

app.py

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+import streamlit as st
+
+# --- Data Structures ---
+Inventory = [
+    ("Apples", 250),
+    ("Cherry", 650),
+    ("Chickoo", 50),
+    ("Oranges", 80),
+    ("Mangoes", 150),
+]
+
+# Convert Inventory into a dictionary for easier lookup: {"Apples": 250, "Cherry": 650, ...}
+price_dict = {item[0]: item[1] for item in Inventory}
+
+# Initialize the cart in session state if not already present
+if "cart" not in st.session_state:
+    st.session_state.cart = []  # Each element will be a tuple (product_name, quantity)
+
+# --- Streamlit Layout ---
+st.title("Shopping Cart Management System")
+
+# 1. Add Products to the Shopping Cart
+st.subheader("Add Items to Your Cart")
+product_list = [item[0] for item in Inventory]  # ["Apples", "Cherry", "Chickoo", "Oranges", "Mangoes"]
+selected_product = st.selectbox("Select a product", product_list)
+selected_quantity = st.number_input("Quantity", min_value=1, value=1, step=1)
+
+if st.button("Add to Cart"):
+    # Append (product, quantity) to the cart
+    st.session_state.cart.append((selected_product, selected_quantity))
+    st.success(f"Added {selected_quantity} {selected_product}(s) to your cart!")
+
+st.write("---")
+
+# 2. Display and Remove Items from the Shopping Cart
+st.subheader("Items in Your Cart")
+if len(st.session_state.cart) == 0:
+    st.info("Your cart is empty. Add some items!")
+else:
+    # List each item along with remove button
+    for i, (product, quantity) in enumerate(st.session_state.cart):
+        col1, col2, col3 = st.columns([3, 2, 1])
+        with col1:
+            st.write(f"**{product}** x {quantity} @ {price_dict[product]} each")
+        with col2:
+            st.write(f"Subtotal: {price_dict[product] * quantity}")
+        with col3:
+            # Create a dynamic remove button
+            remove_button_label = f"Remove-{i}"
+            if st.button("Remove", key=remove_button_label):
+                st.session_state.cart.pop(i)
+                st.experimental_rerun()  # Refresh the app so the item disappears immediately
+
+    # 3. Calculate the Total Bill
+    total_bill = sum(price_dict[p] * q for p, q in st.session_state.cart)
+    st.write("---")
+    st.subheader(f"**Total Bill: {total_bill}**")