Minor cleanup

app.py

@@ -1,60 +1,77 @@
-#Python libraries that we need to import for our bot
+# Python libraries that we need to import for our bot
+import os
 import random
+
 from flask import Flask, request
 from pymessenger.bot import Bot
-import os 
+
 app = Flask(__name__)
-ACCESS_TOKEN = 'ACCESS_TOKEN'   #ACCESS_TOKEN = os.environ['ACCESS_TOKEN']
-VERIFY_TOKEN = 'VERIFY_TOKEN'   #VERIFY_TOKEN = os.environ['VERIFY_TOKEN']
-bot = Bot (ACCESS_TOKEN)
+ACCESS_TOKEN = os.environ.get('ACCESS_TOKEN', 'ACCESS_TOKEN')
+VERIFY_TOKEN = os.environ.get('VERIFY_TOKEN', 'VERIFY_TOKEN')
+bot = Bot(ACCESS_TOKEN)
+
 
-#We will receive messages that Facebook sends our bot at this endpoint 
+# We will receive messages that Facebook sends our bot at this endpoint
 @app.route("/", methods=['GET', 'POST'])
 def receive_message():
     if request.method == 'GET':
-        """Before allowing people to message your bot, Facebook has implemented a verify token
-        that confirms all requests that your bot receives came from Facebook.""" 
+        # Before allowing people to message your bot, Facebook has
+        # implemented a verify token that confirms all requests that
+        # your bot receives came from Facebook.
         token_sent = request.args.get("hub.verify_token")
         return verify_fb_token(token_sent)
-    #if the request was not get, it must be POST and we can just proceed with sending a message back to user
+    # if the request was not get, it must be POST and we can just
+    # proceed with sending a message back to user
     else:
         # get whatever message a user sent the bot
-       output = request.get_json()
-       for event in output['entry']:
-          messaging = event['messaging']
-          for message in messaging:
-            if message.get('message'):
-                #Facebook Messenger ID for user so we know where to send response back to
-                recipient_id = message['sender']['id']
-                if message['message'].get('text'):
-                    response_sent_text = get_message()
-                    send_message(recipient_id, response_sent_text)
-                #if user sends us a GIF, photo,video, or any other non-text item
-                if message['message'].get('attachments'):
-                    response_sent_nontext = get_message()
-                    send_message(recipient_id, response_sent_nontext)
+        output = request.get_json()
+        for event in output['entry']:
+            messaging = event['messaging']
+            for message in messaging:
+                if message.get('message'):
+                    # Facebook Messenger ID for user so we know where
+                    # to send response back to
+                    recipient_id = message['sender']['id']
+                    if message['message'].get('text'):
+                        response_sent_text = get_message()
+                        send_message(recipient_id, response_sent_text)
+                    # if user sends us a GIF, photo,video, or any other
+                    # non-text item
+                    if message['message'].get('attachments'):
+                        response_sent_nontext = get_message()
+                        send_message(recipient_id, response_sent_nontext)
     return "Message Processed"
 
 
 def verify_fb_token(token_sent):
-    #take token sent by facebook and verify it matches the verify token you sent
-    #if they match, allow the request, else return an error 
+    """Take token sent by facebook and verify it matches the verify
+    token you sent. If they match, allow the request, else return an
+    error
+    """
     if token_sent == VERIFY_TOKEN:
         return request.args.get("hub.challenge")
     return 'Invalid verification token'
 
 
-#chooses a random message to send to the user
 def get_message():
-    sample_responses = ["You are stunning!", "We're proud of you.", "Keep on being you!", "We're greatful to know you :)"]
+    """Chooses a random message to send to the user"""
+    sample_responses = (
+        "You are stunning!",
+        "We're proud of you.",
+        "Keep on being you!",
+        "We're grateful to know you :)"
+    )
     # return selected item to the user
     return random.choice(sample_responses)
 
-#uses PyMessenger to send response to user
+
 def send_message(recipient_id, response):
-    #sends user the text message provided via input response parameter
+    """Use PyMessenger to send user the text message provided via input
+    response parameter
+    """
     bot.send_text_message(recipient_id, response)
     return "success"
 
+
 if __name__ == "__main__":
     app.run()