fail elegantly when stock symbol not found

.gitignore

@@ -0,0 +1,60 @@
+# Created by .ignore support plugin (hsz.mobi)
+### Python template
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+

main.py

@@ -4,35 +4,79 @@
 app = Flask(__name__)
 
 
+CONTENT_TYPE = {'Content-Type': 'application/json;charset=UTF-8'}
+
+def generate_response(output_speech, card_title="", card_subtitle="", card_content="", session_attributes={}, should_end_session=True):
+    response = {
+        "version": "1.0",
+        "sessionAttributes": {
+            "user": {
+                "name": "nelson"
+            }
+        },
+        "response": {
+            "outputSpeech": {
+                "type": "PlainText",
+                "text": output_speech
+            },
+            "card": {
+                "type": "Simple",
+                "title": card_title,
+                "subtitle": card_subtitle,
+                "content": card_content
+            },
+            "shouldEndSession": should_end_session
+        }
+    }
+    return json.dumps(response)
+
+
 @app.route('/', methods=['GET', 'POST'])
 def post():
     logging.info(json.dumps(request.json, indent=4, sort_keys=False))
 
+    response = ""
+
     stock_name = request.json["request"]["intent"]["slots"]["Stock"]["value"]
 
     logging.info("Stock name: %s" % stock_name)
 
     # Query API to convert name to Symbol
     name_dict = requests.get('http://dev.markitondemand.com/Api/v2/Lookup/json?input={}'.format(stock_name)).json()
-    symbol = name_dict[0]["Symbol"]
-    company_name = name_dict[0]["Name"]
+
+    try:
+        symbol = name_dict[0]["Symbol"]
+        company_name = name_dict[0]["Name"]
+    except IndexError:
+        response = generate_response("Symbol not found for %s." % stock_name)
+        return response, 200, CONTENT_TYPE
 
     logging.info("Symbol: %s" % symbol)
     logging.info("Name: %s" % company_name)
 
     # Query API to get quote for symbol
     quote_dict = requests.get('http://dev.markitondemand.com/Api/v2/Quote/json?symbol={}'.format(symbol)).json()
-    last_price = quote_dict["LastPrice"]
+    try:
+        last_price = quote_dict["LastPrice"]
+    except IndexError:
+        response = generate_response("Price not found for %s." % stock_name)
+        return response, 200, CONTENT_TYPE
 
     logging.info("Last Price: %s" % last_price)
 
     # If it's after 4:00pm say closed, otherwise say current price
     # Subscribe to a notification when the price of the stock reaches something
 
-    response = '{"version":"1.0","sessionAttributes":{"user":{"name":"nelson"}},"response":{"outputSpeech":{"type":"PlainText","text":"Today, %s closed at %s dollars."},"card":{"type":"Simple","title":"%s","subtitle":"%s closed at %s dollars.","content":""},"shouldEndSession":true}}' % (company_name, last_price, symbol, company_name, last_price)
+    closing_text = "%s closed at %s dollars." % (company_name, last_price)
+
+    response = generate_response(
+        output_speech=closing_text,
+        card_title=symbol,
+        card_subtitle=closing_text,
+        card_content="")
 
     logging.info(json.dumps(json.loads(response), indent=4, sort_keys=False))
-    return response, 200, {'Content-Type': 'application/json;charset=UTF-8'}
+    return response, 200, CONTENT_TYPE
 
 
 if __name__ == '__main__':