Build a Book Recommendation SMS Bot

import os
from airtable import Airtable
from flask import Flask, request, session
from twilio.twiml.messaging_response import MessagingResponse

app = Flask(__name__)
app.config['SECRET_KEY'] = os.environ.get('FLASK_SECRET_KEY')

# This is required to read/write from AirTable base (GET/POST)
AIRTABLE_BASE_ID = os.environ.get("AIRTABLE_BASE_ID")

@app.route('/send-rec', methods=['POST'])
def send_rec():
   """
   a function that sends the SMS message
   """
   incoming_msg = request.values.get('Body', 'message error').lower()
      
   if not 'sms_count' in session:
       session['sms_count'] = 0
       session["1"] = get_authors("1")
      
   sms_count = session['sms_count']
    if sms_count == 0:
        sms_message = "Want a recommendation for a Black-authored book? Respond with the 
                                    number that corresponds with the genre you want:\n1 for Anti-racism 📕"
   else:
       try:
           book_dict = session[str(incoming_msg)]
           book_id_choice = next(iter(book_dict))

            # send back nicely formatted title, author, and book
sms_message = "{title} by {author}\nBuy it here: {link}\n\nGet another               
recommendation!\n1. Anti-racism 📕").format(
                                                       title = book_dict[book_id_choice]['book_title'],
                                                       author = book_dict[book_id_choice]['book_author'],
                                                       link = book_dict[book_id_choice]['book_link'])

           # delete that item from the dictionary
           del session[str(incoming_msg)][book_id_choice]
       except:
           # if there are no options left for this genre, let them know
           sms_message = "That's every book we have in that genre.\nTry another one.\n1.
Anti-racism 📕"

   session['sms_count'] += 1
   resp = MessagingResponse()
   msg = resp.message()
   msg.body(sms_message)

   return str(resp)

def get_authors(genre):
   """
   a function that gets the book data from airtable
   """
   airtable = Airtable(AIRTABLE_BASE_ID, genre)
   authors = {}

   for page in airtable.get_iter(view='books'):
       for record in page:
           fields = record['fields']
           authors[fields['ID']] = {'book_title' : fields['Title'],
                                    'book_author': fields['Author'],
                                    'book_link': fields['Link']}

   return authors