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Week 3 Day 1
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MVC
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============
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Schedule Today:
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Morning
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-------
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Weekend Projects Review and Refactor
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Monty Hall Problem
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Afternoon
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---------
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Bank Software
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SQL Challenge
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#### Resources
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[Optimizing SQL queries](http://beginner-sql-tutorial.com/sql-query-tuning.htm)
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[A cool article about your git history](http://mislav.uniqpath.com/2014/02/hidden-documentation/)
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[Reading for tonight - the coffee maker problem](http://www.objectmentor.com/resources/articles/CoffeeMaker.pdf)
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#### Homework
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Finish up your assignments for today.
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[Also, read this](http://www.objectmentor.com/resources/articles/CoffeeMaker.pdf)
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Your Own Private Bank
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======================
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Welcome back! In this challenge you'll be creating a rich Python terminal app emulating bank software.
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###Step 1: Database
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Our DB schema for this challenge is simple. For now, we only need two tables - Users and accounts. A user can have many accounts. Users should have at minimum a username to log in to the app, a time when they were created, and a permissions level. An account should have a number and a balance. Design the schema in SQL designer if it helps you.
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There's a file called create_db.py - write your sql that creates the db in there to keep everything organized.
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###Step 2: Our program models
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We need two different classes for users - a client, and a banker. A client should be able to view all their accounts, deposit and withdraw funds to and from their OWN accounts, and transfer money from their OWN accounts to another user account. A banker should be able to create accounts, deposit and withdraw funds from ANY user account, and transfer money between ANY two user accounts. A banker should not have any accounts (no co-mingling of funds) and a person should not see the superuser options that bankers have. How you want to design this is up to you. See [inheritance](http://www.jesshamrick.com/2011/05/18/an-introduction-to-classes-and-inheritance-in-python/)
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I also strongly recommend that you have another class (see [static methods](https://julien.danjou.info/blog/2013/guide-python-static-class-abstract-methods)) or a module that handles only reading and writing to the database.
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###Step 3: Controller and Views
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Stick to the MVC pattern - No spaghetti code! Keep your code dry. There's alot of user choice options which could be alot of if/else statements - can you think of a better way?
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Present a nice clean interface to the user for the options they are allowed to perform. Some extra account details would be nice to display - some ideas are how long the user has been a member of the bank, which banker created their account, etc.
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import bank_models
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import bank_views
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import sqlite3
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import sqlite3
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Loan or No Loan?
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================
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Here is some people's last month bank statements. Query the database to answer the questions. Write methods to return all of the information to you. Don't do this manually.
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* How many people are there in the database?
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* What is each persons salary (return their name and salary)?
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* What is each persons net income?
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* How about their highest expense?
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* What percent of their salary did they spend?
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* What was the average price of their expenses (don't include salary)?
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* How many expenses did each person have?
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* How many things did each person buy in the first week of the month? How much money did they spend?
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* How about in the last week?
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* Print everything bought between $40 and $60.
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* Using the mortgage calculator you built before (some adjustments will need to be made), how large of a house could each person afford on a 15 year mortgage at 4%, if they plan on saving $200 a month (assuming they keep their jobs and spend the same amount).
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* Write the database to a csv.
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