Learning Embedded Android N Programming by Ivan Morgillo (Author), Stefano Viola (Author)

Create the perfectly customized system by unleashing the power of Android OS on your embedded device About This Book * Understand the system architecture and how the source code is organized * Explore the power of Android and customize the build system 

* Build a fully customized Android version as per your requirements Who This Book Is For If you are a Java programmer who wants to customize, build, and deploy your own Android version using embedded programming, then this book is for you. What You Will Learn *

 Master Android architecture and system design * Obtain source code and understand the modular organization * Customize and build your first system image for the Android emulator * Level up and build your own Android system for a real-world device * 

Use Android as a home automation and entertainment system * Tailor your system with optimizations and add-ons * Reach for the stars: look at the Internet of Things, entertainment, and domotics In Detail Take a deep dive into the Android build system and its customization with Learning Embedded Android Programming, written to help you master the steep learning curve of working with embedded Android. Start by exploring the basics of Android OS, discover Google's "repo" system, and discover how to retrieve AOSP source code. 

You'll then find out to set up the build environment and the first AOSP system. Next, learn how to customize the boot sequence with a new animation, and use an Android "kitchen" to "cook" your custom ROM. By the end of the book, you'll be able to build customized Android open source projects by developing your own set of features. 

Style and approach This step-by-step guide is packed with various real-world examples to help you create a fully customized Android system with the most useful features available.

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Learning Embedded Android N Programming Paperback – Import, 6 Jan 2016 by Ivan Morgillo (Author), Stefano Viola (Author) 

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Learning Embedded Android N Programming Paperback – Import, 6 Jan 2016 by Ivan Morgillo (Author), Stefano Viola (Author) 

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Redirect and Errors

Flask class has a redirect() function. When called, it returns a response object and redirects the user to another target location with specified status code.

Prototype of redirect() function is as below −

Flask.redirect(location, statuscode, response)

In the above function − 1.location parameter is the URL where response should be redirected. 2.statuscode sent to browser’s header, defaults to 302. 3.response parameter is used to instantiate response.

The following status codes are standardized − 1.HTTP_300_MULTIPLE_CHOICES 2.HTTP_301_MOVED_PERMANENTLY 3.HTTP_302_FOUND 4.HTTP_303_SEE_OTHER 5.HTTP_304_NOT_MODIFIED 6.HTTP_305_USE_PROXY 7.HTTP_306_RESERVED 8.HTTP_307_TEMPORARY_REDIRECT

The default status code is 302, which is for ‘found’. In the following example, the redirect() function is used to display the login page again when a login attempt fails.

from flask import Flask, redirect, url_for, render_template, request # Initialize the Flask application

app = Flask(__name__) @app.route('/') def index(): return render_template('log_in.html') @app.route('/login',methods = ['POST', 'GET']) def login(): if request.method == 'POST' and request.form['username'] == 'admin' : return redirect(url_for('success')) return redirect(url_for('index')) @app.route('/success') def success(): return 'logged in successfully' if __name__ == '__main__': app.run(debug = True)

Flask class has abort() function with an error code. Flask.abort(code)

The Code parameter takes one of following values − 1.400 − for Bad Request 2.401 − for Unauthenticated 3.403 − for Forbidden 4.404 − for Not Found 5.406 − for Not Acceptabl 6.415 − for Unsupported Media Type 7.429 − Too Many Requests

Let us make a slight change in the login() function in the above code. Instead of re-displaying the login page, if ‘Unauthourized’ page is to be displayed, replace it with call to abort(401).

from flask import Flask, redirect, url_for, render_template, request, abort

app = Flask(__name__) @app.route('/') def index(): return render_template('log_in.html') @app.route('/login',methods = ['POST', 'GET']) def login(): if request.method == 'POST': if request.form['username'] == 'admin' : return redirect(url_for('success')) else: abort(401) else: return redirect(url_for('index')) @app.route('/success') def success(): return 'logged in successfully' if __name__ == '__main__': app.run(debug = True)

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Computer Science Programming Basics in Ruby: Exploring Concepts and Curriculum with Ruby by Ophir Frieder (Author), Gideon Frieder (Author), David Grossman (Author)

If you know basic high-school math, you can quickly learn and apply the core concepts of computer science with this concise, hands-on book. Led by a team of experts, you’ll quickly understand the difference between computer science and computer programming, and you’ll learn how algorithms help you solve computing problems.

Each chapter builds on material introduced earlier in the book, so you can master one core building block before moving on to the next. You’ll explore fundamental topics such as loops, arrays, objects, and classes, using the easy-to-learn Ruby programming language. Then you’ll put everything together in the last chapter by programming a simple game of tic-tac-toe.

• Learn how to write algorithms to solve real-world problems
• Understand the basics of computer architecture
• Examine the basic tools of a programming language
• Explore sequential, conditional, and loop programming structures
• Understand how the array data structure organizes storage
• Use searching techniques and comparison-based sorting algorithms
• Learn about objects, including how to build your own
• Discover how objects can be created from other objects
• Manipulate files and use their data in your software
•  

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Computer Science Programming Basics in Ruby: Exploring Concepts and Curriculum with Ruby 1st Edition, Kindle Edition by Ophir Frieder (Author), Gideon Frieder (Author), David Grossman (Author) 

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Computer Science Programming Basics in Ruby: Exploring Concepts and Curriculum with Ruby 1st Edition, Kindle Edition by Ophir Frieder (Author), Gideon Frieder (Author), David Grossman (Author) 

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Make Your Own Twine Games! Paperback – Import, 26 Mar 2019 by Anna Anthropy (Author)

Twine is a free online tool that lets anyone new to programming create their own interactive, story-based adventure games in a web page.

In Make Your Own Twine Games!, game designer Anna Anthropy takes you step-by-step through the game development process, from coming up with a basic idea to structuring your game. You’ll learn the basics of Twine like how to use links and apply images and formatting to make your game look more distinct. You’ll get tips on how to test your game, export it, and publish it online, and even understand more advanced features like scripting to get your game to remember and respond to player choices. As you make your way through the book and begin crafting your own interactive fiction, you’ll learn other cool tricks like how to:

• Write stories that follow multiple paths using hyperlinks
• Create variables to track your player’s actions
• Add scripting like “if” and “else” to decide when ghosts should appear in your game
• Use hooks to add fancy touches like text effects, pictures, and sound 

With example games to act as inspiration, Make Your Own Twine Games! will take you from story-teller to game designer in just a few clicks! Ready player one? The game starts now.

Covers Twine 2

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Make Your Own Twine Games! Paperback – Import, 26 Mar 2019 by Anna Anthropy (Author) 

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Make Your Own Twine Games! Paperback – Import, 26 Mar 2019 by Anna Anthropy (Author) 

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Finding a Year is leap or not in Python

@author python.learning
>>> def check_year(year):
...      if year%4==0 and year%100!=0 or year%400==0:
...            print ('leap year')
...      else:
               print ('not a leap year')
>>>  check_year(1972)
leap year
>>>  check_year(1975)
not a leap year



# or check with calendar
>>> import calendar
>>> print (calendar.isleap(1972) )
True
>>> print (calendar.isleap(1975) )
False

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