pages/2_🎖️_Ranking.py

import streamlit as st
import numpy as np
import pandas as pd
from streamlit_extras.switch_page_button import switch_page

if __name__ == "__main__":
    st.set_page_config(page_title="Personal Image Ranking", page_icon="🎖️️", layout="wide")

    if 'user_id' not in st.session_state:
        st.warning('Please log in first.')
        home_btn = st.button('Go to Home Page')
        if home_btn:
            switch_page("home")

    else:
        all_checked = 0
        for key, value in st.session_state.selected_dict.items():
            for v in value:
                all_checked += 1

        if all_checked == 0:
            st.info('You have not checked any image yet. Please go back to the gallery page and check some images.')
            gallery_btn = st.button('Go to Gallery')
            if gallery_btn:
                switch_page('gallery')
        else:
            st.write('You have checked ' + str(all_checked) + ' images.')