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def add_new_chat_session (self, client: Client, agent: Agent) -> datetime:
    ''' Creates a new chat session between the given client and agent; Returns the unique starting timestamp for that session
        This function doesn't handle the communication for the chat session. The controller should do this.'''
    pass

def log_message (self, session_timestamp: datetime, sendor_name: str, message: str) -> None:
    ''' Records the message to the chat session with the associated timestamp '''
    pass

def end_chat_session (self, session_timestamp: datetime) -> None:

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# model.py - State and logic

import view

from datetime import datetime

# data structures
GENERAL_OPTIONS = ['Feedback', 'Question', 'Other']

QUESTION_OPTIONS = ['How do I place an order?','How do I use the Wishlist?','How do I cancel/edit an order?']

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import model

if __name__ == '__main__':

    state = model.State()

    print('visitor')
    visitor = model.Visitor('localhost', 8888) # a listener on the server should increment the number of clients
    visitor.set_up_client()

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# view.py - Display state to user

def get_choice_index_from_option_menu(option_list, question):
    '''Prints a menu of options determined by the list with a question prompt and return the user's choice as the index of the selected item (index based on option_list)'''
    validOptions = ""

    print('')
    for i in range(len(option_list)): 
        validOptions = validOptions + str(i)
        print('{}.{}'.format(i+1, option_list[i]))

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// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

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Packages

• lxml - Pythonic binding for the C libraries libxml2 and libxslt.
• boto - Python interface to Amazon Web Services
• Django - Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design.
• Fabric - Library and command-line tool for streamlining the use of SSH for application deployment or systems administration task.
• PyMongo - Tools for working with MongoDB, and is the recommended way to work with MongoDB from Python.
• Celery - Task queue to distribute work across threads or machines.
• pytz - pytz brings the Olson tz database into Python. This library allows accurate and cross platform timezone calculations using Python 2.4 or higher.

Guides

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Libraries

• jQuery - The de-facto library for the modern age. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers.
• Backbone - Backbone.js gives structure to web applications by providing models with key-value binding and custom events, collections with a rich API of enumerable functions, views with declarative event handling, and connects it all to your existing API over a RESTful JSON interface.
• AngularJS - Conventions based MVC framework for HTML5 apps.
• Underscore - Underscore is a utility-belt library for JavaScript that provides a lot of the functional programming support that you would expect in Prototype.js (or Ruby), but without extending any of the built-in JavaScript objects.
• lawnchair - Key/value store adapter for indexdb, localStorage

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Gems

• Bundler - Bundler maintains a consistent environment for ruby applications. It tracks an application's code and the rubygems it needs to run, so that an application will always have the exact gems (and versions) that it needs to run.
• rabl - General ruby templating with json, bson, xml, plist and msgpack support
• Thin - Very fast and lightweight Ruby web server
• Unicorn - Unicorn is an HTTP server for Rack applications designed to only serve fast clients on low-latency, high-bandwidth connections and take advantage of features in Unix/Unix-like kernels.
• SimpleCov - SimpleCov is a code coverage analysis tool for Ruby 1.9.
• Zeus - Zeus preloads your Rails app so that your normal development tasks such as console, server, generate, and specs/tests take less than one second.
• [factory_girl](h

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Libraries

• 960 Grid System - An effort to streamline web development workflow by providing commonly used dimensions, based on a width of 960 pixels. There are two variants: 12 and 16 columns, which can be used separately or in tandem.
• Compass - Open source CSS Authoring Framework.
• Bootstrap - Sleek, intuitive, and powerful mobile first front-end framework for faster and easier web development.
• Font Awesome - The iconic font designed for Bootstrap.
• Zurb Foundation - Framework for writing responsive web sites.
• SASS - CSS extension language which allows variables, mixins and rules nesting.
• Skeleton - Boilerplate for responsive, mobile-friendly development.

Guides

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/*
 * Copyright 2011 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software