test.py

import streamlit as st

# Initialize session state to track the active tab
if 'active_tab' not in st.session_state:
    st.session_state.active_tab = 0  # Set default tab (0 for first tab)

# Create tabs using st.radio or st.selectbox
tab_options = ['Tab 1', 'Tab 2', 'Tab 3']
selected_tab = st.radio('Select a tab', tab_options, index=st.session_state.active_tab)
# Some condition to trigger the tab change (for example, based on user input or action)
def some_condition():
    # Define your condition, for example, a button press or other condition
    return st.button('Switch to Tab 2')
# Conditionally switch tabs based on a condition
if some_condition():
    st.session_state.active_tab = 1  # Switch to Tab 2 (index 1)

# Render content based on the selected tab
if selected_tab == 'Tab 1':
    st.write("You are on Tab 1")
elif selected_tab == 'Tab 2':
    st.write("You are on Tab 2")
else:
    st.write("You are on Tab 3")