Code Editor for app.py

import streamlit as st
import random

# Initialize session state for the options if not exists
if 'options' not in st.session_state:
    st.session_state.options = [
        "Red Apple", 
        "Blue Sky", 
        "Green Grass",
        "Yellow Sun",
        "Purple Mountains",
        "Orange Sunset",
        "Pink Flowers",
        "Brown Earth"
    ]

st.title("Selection and Cleanup Demo")

# Create the dropdown
selected_item = st.selectbox(
    "Choose an item:",
    st.session_state.options,
    index=None,
    placeholder="Select an item..."
)

# Create the button
if st.button("Show and Clear Selection"):
    if selected_item:
        st.success(f"You selected: {selected_item}")
        # Remove the selected item from the options
        st.session_state.options = [opt for opt in st.session_state.options if opt != selected_item]
        # Rerun the app to update the dropdown
        st.rerun()
    else:
        st.warning("Please select an item first!")