pages/page_1.py

# page_1.py inside 'pages' folder
import streamlit as st

def run(go_to_main, go_to_page_2):
    st.markdown("# Page 1 📄")
    st.button('Go to Main Page', on_click=go_to_main)
    st.button('Go to Page 2', on_click=go_to_page_2)
    # Rest of your page 1 code