app.py

import streamlit as st
import textract
from pathlib import Path
import spacy
from spacy.matcher import Matcher

st.title('Find 13-digit ISBN Numbers')
st.image('https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/A_Small_Book_of_Designs_copy_A_object_21_The_First_Book_of_Urizen_plate_5.jpg/640px-A_Small_Book_of_Designs_copy_A_object_21_The_First_Book_of_Urizen_plate_5.jpg')

nlp = spacy.blank('xx')
nlp.max_length = 1200000
matcher = Matcher(nlp.vocab)
pattern = [{'IS_DIGIT': True},
           {'ORTH': '-'},
           {'IS_DIGIT': True},
           {'ORTH': '-'},
           {'IS_DIGIT': True},
           {'ORTH': '-'},
           {'IS_DIGIT': True},
           {'ORTH': '-'},
           {'IS_DIGIT': True}]
matcher.add("ISBN",[pattern])

isbn = """"""
uploaded_files = st.file_uploader("Select files to process", accept_multiple_files=True)

for uploaded_file in uploaded_files:
    file_type = uploaded_file.type
    #TODO process file in memory without writing to disk or write tempfile.NamedTemporaryFile
    Path(uploaded_file.name).write_bytes(uploaded_file.read())
    text = textract.process(uploaded_file.name)
    text = text.decode('utf-8')
    doc = nlp(text)
    matches = matcher(doc)
    st.write(f'Found {len(matches)} ISBN numbers')    
    for match_id,start,end in matches:
        isbn += f"{doc[start:end]}\n"

st.download_button('Download', isbn, 'text/plain')