Streamlit pagination

app.py

import streamlit as st
import numpy as np

#------------------------------------------------------
#-- Side bar
#------------------------------------------------------
st.sidebar.markdown('## Pagination')
pagSelected = st.sidebar.radio('Choose a page: ', ['A','B','Crash'])

#------------------------------------------------------
#-- Web App
#------------------------------------------------------
st.write('# Pagination Example')


def pageA():
    st.write('## Page A')
    st.write('Example..')


def pageB():
    st.write('## Page B')
    st.write('Example.. Again?')


#-- Main pagination
def main(selection):
    if selection == 'A':
        pageA()
    elif selection == 'B':
        pageB()
    else:
        st.write('## Error 404')
        st.write('Thanks for testing!')


if __name__ == '__main__':
    main(pagSelected)