pages/1_page_1.py

import streamlit as st

form_fields = st.session_state['form_fields']
form_fields['page_1_a'] = st.text_input("Enter something", form_fields['page_1_a'] or "")
form_fields['page_1_b'] = st.text_input("Enter something else", form_fields['page_1_b'] or "")

count = 0
if form_fields['page_1_a'].strip():        
    count += 1
if form_fields['page_1_b'].strip():
    count += 1

f"Count for this page is {count}"

st.sidebar.progress(st.session_state['progress']())