Code Editor for app.py

import streamlit as st
import pandas as pd

def main():
    st.title("Order Management System")
    
    # Initialize session state for order list if not exists
    if "orders" not in st.session_state:
        st.session_state.orders = []
    
    col_input, col_table = st.columns([1, 2])
    
    with col_input:
        st.write("### Add Product")
        product_name = st.text_input("Product Name")
        product_price = st.number_input("Price", min_value=0.0, format="%.2f")
        product_priority = st.selectbox("Priority", ["high", "medium", "low"])
        
        if st.button("Add Product"):
            if not product_name:
                st.error("Please provide name")
            elif product_price <= 0:
                st.error("Price should be positive number")
            else:
                st.session_state.orders.append({"Product": product_name, "Price": product_price, "Priority": product_priority})
    
    with col_table:
        st.write("### Total Price: $", f"{sum([item['Price'] for item in st.session_state.orders]):.2f}")
        
        st.write("### Order Summary")
        if st.session_state.orders:
            priority_order = {"high": 1, "medium": 2, "low": 3}
            df = pd.DataFrame(st.session_state.orders)
            df = df.sort_values(by="Priority", key=lambda x: x.map(priority_order))
            
            for i, row in df.iterrows():
                col1, col2, col3, col4 = st.columns([3, 1, 1, 1])
                col1.write(row["Product"])
                col2.write(f"${row['Price']:.2f}")
                col3.write(row["Priority"].capitalize())
                if col4.button("❌", key=f"del_{i}"):
                    st.session_state.orders.pop(i)
                    st.rerun()
    
if __name__ == "__main__":
    main()