app.py

import streamlit as st

# Initialize session state
if 'username' not in st.session_state:
    st.session_state.username = ''
if 'scratch_pad' not in st.session_state:
    st.session_state.scratch_pad = ''

def save_session():
    st.session_state.username = username
    st.session_state.scratch_pad = scratch_pad

st.title("Welcome to My App")

if st.session_state.username:
    st.subheader(f"Welcome back, {st.session_state.username}!")
    scratch_pad = st.text_area("Scratch Pad", value=st.session_state.scratch_pad, height=200)
    if st.button("💾 Save"):
        save_session()
else:
    username = st.text_input("Please enter your name:")
    if st.button("🔑 Login"):
        save_session()