button_pages.py

import SessionState
import streamlit as st

st.beta_set_page_config(
    page_icon=":shark:",
    layout="wide",

)



sesh = SessionState.get(curr_page = 0)


def pageZero():
    st.title('This is page zero! welcome')
    st.write('some text for zeroth page. Welcome to the app. Follow the nav buttons above to move forward and backwards one page')

def pageOne():
    st.title('page ONE')
    st.write('two')

def pageTwo():
    st.title('TWO')
    st.write('three')


sesh = SessionState.get(curr_page = 0)
PAGES = [pageZero, pageOne, pageTwo]


def main():
    ####SIDEBAR STUFF
    st.sidebar.title("this is an app:")

    st.sidebar.markdown('Note that as you press Next page, the page numbers go `0, 1, 3!`')

    #####MAIN PAGE NAV BAR:
    st.title('Navigation')
    st.markdown('Click Next to go to the next page')
    if st.button('Back:'):
        sesh.curr_page = max(0, sesh.curr_page-1)
    if st.button('Next page:'):
        sesh.curr_page+= min(len(PAGES), sesh.curr_page+1)
    st.markdown('----------------------------------')


    #####MAIN PAGE APP:
    st.write('PAGE NUMBER:', sesh.curr_page)
    PAGES[sesh.curr_page]()




if __name__=='__main__':
    main()