Hello World - How to Make an Alexa Skill with Python part 2

Hello World - How to Make an Alexa Skill with Python part 2

 
#lambda_function.py
from __future__ import print_function
import json
 
# We'll start with a couple of globals...
CardTitlePrefix = "Greeting"

# --------------- entry point -----------------
 
def lambda_handler(event, context):
    # TODO implement
    print("event.session.application.applicationId=" +
          event['session']['application']['applicationId'])
          
    if event['session']['new']:
        on_session_started({'requestId': event['request']['requestId']},
                           event['session'])

    if event['request']['type'] == "LaunchRequest":
        return on_launch(event['request'], event['session'])
    elif event['request']['type'] == "IntentRequest":
        return on_intent(event['request'], event['session'])
    elif event['request']['type'] == "SessionEndedRequest":
        return on_session_ended(event['request'], event['session'])
    #return response("", response_plain_text("Hello from Lambda!", True))
 

# --------------- Events ------------------
def on_session_started(session_started_request, session):
    """ Called when the session starts """

    print("on_session_started requestId=" + session_started_request['requestId']
          + ", sessionId=" + session['sessionId'])

def on_launch(launch_request, session):
    """ Called when the user launches the skill without specifying what they want """

    print("on_launch requestId=" + launch_request['requestId'] +
          ", sessionId=" + session['sessionId'])
    # Dispatch to your skill's launch
    return get_welcome_response()
   
def on_intent(intent_request, session):
    """ Called when the user specifies an intent for this skill """

    print("on_intent requestId=" + intent_request['requestId'] +
          ", sessionId=" + session['sessionId'])
          
    intent = intent_request['intent']
    intent_name = intent_request['intent']['name']   
    
    # Dispatch to your skill's intent handlers
    if intent_name == "greeting":
        return say_hello()
    elif intent_name == "AMAZON.HelpIntent":
        return get_welcome_response()
    elif intent_name == "AMAZON.CancelIntent" or intent_name == "AMAZON.StopIntent":
        return handle_session_end_request()
    else:
        raise ValueError("Invalid intent") 
          
# --------------- Functions that control the skill's behavior ------------------

def get_welcome_response():
    session_attributes = {}
    card_title = "Hello"
    speech_output = "Welcome to the Hello World demonstration... Ask me to say hello."
    # If the user either does not reply to the welcome message or says something
    # that is not understood, they will be prompted again with this text.
    reprompt_text = "I'm sorry - I didn't understand. You should ask me to say hello..."
    should_end_session = False
    return response(session_attributes, response_plain_text(card_title, speech_output, reprompt_text, should_end_session))
 
def say_hello():
    """
    Return a suitable greeting...
    """
    card_title = "Greeting Message"
    greeting_string = "Hello! this is a demonstration of alexa hello word using python"
    return response({}, response_plain_text(card_title, greeting_string, "Ask me to say hello...", True))

def handle_session_end_request():
    card_title = "Session Ended"
    speech_output = "Have a nice day! "
    # Setting this to true ends the session and exits the skill.
    should_end_session = True
    return response({}, response_plain_text(
        card_title, speech_output, None, should_end_session))
        
# --------------- speech response handlers -----------------
# build the json responses
 
def response_plain_text(title, output, reprompt_text, endsession):
    """ create a simple json plain text response  """
    return {
        'outputSpeech': {
            'type': 'PlainText',
            'text': output
        },
        'card': {
            'type': 'Simple',
            'title': CardTitlePrefix + " - " + title,
            'content': output
        },
        'reprompt': {
            'outputSpeech': {
                'type': 'PlainText',
                'text': reprompt_text
            }
        },
        'shouldEndSession': endsession
    }
 
def response(session_attributes, speech_response):
    """ create a simple json response """
    return {
        'version': '1.0',
        'sessionAttributes': session_attributes,
        'response': speech_response
    }

//skill.json
{
    "interactionModel": {
        "languageModel": {
            "invocationName": "demo quiz",
            "intents": [
                {
                    "name": "AMAZON.CancelIntent",
                    "samples": []
                },
                {
                    "name": "AMAZON.HelpIntent",
                    "samples": []
                },
                {
                    "name": "AMAZON.StopIntent",
                    "samples": []
                },
                {
                    "name": "AMAZON.NavigateHomeIntent",
                    "samples": []
                },
                {
                    "name": "greeting",
                    "slots": [],
                    "samples": [
                        "hello word",
                        "hello"
                    ]
                },
                {
                    "name": "AMAZON.RepeatIntent",
                    "samples": []
                },
                {
                    "name": "AMAZON.StartOverIntent",
                    "samples": [
                        "start new game"
                    ]
                }
            ],
            "types": []
        }
    }
}