app.py

import streamlit as st
from PIL import Image
import io

x = st.slider('Select a value')
st.write(x, 'square is ', x*x)

uploaded_file = st.file_uploader('Enter an input sketch')

if uploaded_file is None:
    st.write('No Input file found. Please contact administrator')

bytes_data = uploaded_file.getvalue()
img = Image.open(io.BytesIO(bytes_data))

st.image(img, caption='retrieved image')