almost working, need to deploy or ngrok

sitter_bot.py

@@ -1,4 +1,6 @@
+import datetime
 import os
+from typing import Optional
 
 import hug
 from twilio.rest import Client as TwilioClient
@@ -13,17 +15,25 @@ timeout_minutes = 120
 sitters = {}
 
 
+class CouldntParse(Exception):
+    pass
+
+
+class NoneAvailable(Exception):
+    pass
+
+
 def say_hi_ask_for_sitters():
     message = "Hey, can you tell me your sitters' info one at a time?"
-    twilio_client.api.account.messages.create(to=my_cell, from_=my_twilio_num, body=message)
+    twilio_client.api.account.messages.create(to=my_cell, from_=booker_num, body=message)
 
 
 @hug.post('/')
-def booker(incoming_message):
+def booker(incoming_message: str) -> str:
     from_num = incoming_message['From']
     print(vars(incoming_message))
 
-    if from_num not in [list(sitters.values()) += [my_cell]]:
+    if from_num not in list(sitters.values()) + [my_cell]:
         # unknown number
         return
 
@@ -44,22 +54,28 @@ def booker(incoming_message):
                 response = f'Darn, I wasn\'t able to book a sitter.  I waited {timeout_minutes} minutes.'
 
 
-def syndicate_and_book(session_start, session_end):
+def syndicate_and_book(session_start: datetime.datetime, session_end: datetime.datetime) -> Optional[str]:
     # blast out to all sitters
     # give it to the first 'yes'
     # handle late 'yeses' and all 'noes'
     # wait until everyone says no or timeout_minutes runs out
+    pass
 
 
-def book_sitter(in_message):
+def book_sitter(in_message: str) -> Optional[str]:
     session_start, session_end = parse_sitter_request(in_message)
     syndicate_and_book(session_start, session_end)
 
 
-def add_sitter(in_message):
+def add_sitter(in_message: str):
     try:
         name, num = parse_sitter_info(in_message)
     except CouldntParse:
         raise
     else:
         sitters[name] = num
+
+
+if __name__ == '__main__':
+    say_hi_ask_for_sitters()
+    hug.API(__name__).http.serve()