From STUPID to SOLID Code! | William DURAND. In the following, I will introduce both STUPID and SOLID principles. Keep in mind that these are principles, not laws. However, considering them as laws would be good for those who want to improve themselves. STUPID code, seriously? ¶ This may hurt your feelings, but you have probably written STUPID code already. I have too. In the following, I will explain the individual points with more details.
Singleton¶ The Singleton pattern is probably the most well-known design pattern, but also the most misunderstood one. Singletons are controversial, and they are often considered anti-patterns. Programs using global state are very difficult to test; Programs that rely on global state hide their dependencies. But should you really avoid them all the time? Tight Coupling¶ If making a change in one module in your application requires you to change another module, then coupling exists. Tightly coupled modules are difficult to reuse, and also hard to test. Untestability¶ Premature Optimization¶ Duplication¶ Nbviewer.ipython.org/github/CamDavidsonPilon/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers/blob/master/Prologue/Prologue. Probabilistic Programming & Bayesian Methods for Hackers Using Python and PyMC The Bayesian method is the natural approach to inference, yet it is hidden from readers behind chapters of slow, mathematical analysis.
The typical text on Bayesian inference involves two to three chapters on probability theory, then enters what Bayesian inference is. Unfortunately, due to mathematical intractability of most Bayesian models, the reader is only shown simple, artificial examples. This can leave the user with a so-what feeling about Bayesian inference. In fact, this was the author's own prior opinion. After some recent success of Bayesian methods in machine-learning competitions, I decided to investigate the subject again. If Bayesian inference is the destination, then mathematical analysis is a particular path to towards it.
Bayesian Methods for Hackers is designed as a introduction to Bayesian inference from a computational/understanding-first, and mathematics-second, point of view. Contents. 10 More Puzzle Websites to Sharpen Your Programming Skills. My recently published Six Revision guest post, 10 Puzzle Websites to Sharpen Your Programming Skills, got a great response, hitting the front page of Hacker News, Reddit, and doing fairly well on Digg too. Lots of comments were left pointing out some sites which weren't included in my list, so I'm following up here with a list of 10 more top programming puzzle websites: 1. Code Chef Code Chef has lots of practice puzzles, and monthly competitions with cash prizes. The site officially supports over 35 programming languages! The Sphere Online Judge contains 1871 different programming problems.
More points are awarded for better performing solutions, which can be submitted in a range of languages. 3. The aim with code golf is to submit a solution using the fewest characters possible.Solutions can be submitted in Perl, Python PHP or Ruby. 4. Over 2600 great programming puzzles, and also regular contests. 5. An online competition site that automatically checks your submissions. 6. 7. 8. 9. 10. Free java Programming Language Books Download.
An Introduction to Object-Oriented Programming with Java pdf An Introduction to Object-Oriented Programming with Java takes a full-immersion approach to object-oriented programming. Proper object-oriented design practices are emphasized throughout the book. Students learn how to use the standard classes first, then learn to design their own classes. Wu uses a gentler approach to teaching students how to design their own classes, separating the coverage into two chapters. GUI coverage is also located independently in the back of the book and can be covered if desired. Java for the Beginning Programmer pdf Java for the Beginning Programmer teaches Java to someone with absolutely no programming background. Learning Java (4th Edition) Java is the preferred language for many of today's leading-edge technologies¡ªeverything from smartphones and game consoles to robots, massive enterprise systems, and supercomputers.
Thinking in Java (4th Edition) Think Java: How to Think Like a Computer Scientist. 10 Mistakes That JavaScript Beginners Often Make. Martin Angelov JavaScript is an easy language to get started with, but to achieve mastery takes a lot of effort. Beginners often make a few well-known mistakes that come back and bite them when they least expect. To find which these mistakes are, keep reading! 1. Missing curly braces One practice, which JavaScript beginners are often guilty of, is omitting curly braces after statements like if, else, while and for.
Run Although the fail() call is indented and looks as if it belongs to the if statement, it does not. 2. When JavaScript is parsed, there is a process known as automatic semicolon insertion. // This code results in a type error. Because there is a semicolon missing on line 3, the parser assumes that the opening bracket on line 5 is an attempt to access a property using the array accessor syntax (see mistake #8), and not a separate array, which is not what was intended and results in a type error. 3. JavaScript is dynamically typed. 4. 5. Var a = 0.1, b = 0.2; // Surprise! 6. 7. Evaluations Made Easy. Our dynamic filtering gives you access to all of the information you want. See how you rank against other developers based on any combination of language, location, experience, team, group, or anything else. Practical threaded programming with Python. Introduction With Python, there is no shortage of options for concurrency, the standard library includes support for threading, processes, and asynchronous I/O.
In many cases Python has removed much of the difficulty in using these various methods of concurrency by creating high-level modules such as asynchronous, threading, and subprocess. Outside of the standard library, there are third solutions such as twisted, stackless, and the processing module, to name a few. This article focuses exclusively on threading in Python, using practicle examples. It is important to first define the differences between processes and threads. Hello Python threads To follow along, I assume that you have Python 2.5 or greater installed, as many examples will be using newer features of the Python language that only appear in at least Python2.5.
Hello_threads_example If you run this example, you get the following output: The last three lines of code actually call the class and start the threads. . #! Back to top. Structure and Interpretation of Computer Programs. Top 25 Most Dangerous Programming Mistakes. Introduction to Android Development. Mobiletuts+ will be covering all major mobile platforms - iPhone, Windows, Android and Blackberry. Today we'll be taking a look at Android development: explaining why people have choosen to work with Android and providing an overview of the Eclipse IDE and its Java, DDMS and debugging perspectives.
Finally, you'll learn how to get started making your first Android app! Android 101 Tutorials: What is Android? Android is an open source mobile operating system that combines and builds upon parts of many different open source projects. What does this mean to you as a developer? Why Android? There are many advantages to developing for the Android platform: Zero startup costs to begin development. Prerequisites before continuing with this article include: You must download and install the Eclipse IDE. The Eclipse IDE Eclipse is a complex, multi-language, and extensible Integrated Development Environment (IDE).
The Java Perspective The DDMS Perspective The Debugging Perspective Your First Application. IrrEdit - a free realtime 3D world editor and radiosity lightmap generator. Making GIFs from Video Files with Python - __del__( self ) Sometimes producing a good animated GIF requires a few advanced tweaks, for which scripting can help. So I added a GIF export feature to MoviePy, a Python package originally written for video editing. For this demo we will make a few GIFs out of this trailer: You can download it with this command if you have Youtube-dl installed: Converting a video excerpt into a GIF In what follows we import MoviePy, we open the video file, we select the part between 1’22.65 (1 minute 22.65 seconds) and 1’23.2, reduce its size (to 30% of the original) and save it as a GIF: Cropping the image For my next GIF I will only keep the center of the screen.
Freezing a region Many GIF makers like to freeze some parts of the GIF to reduce the file size and/or focus the attention on one part of the animation. In the next GIF we freeze the left part of the clip. Freezing a more complicated region Time-symetrization Surely you have noticed that in the previous GIFs, the end did not always look like the beginning. Learning Modern 3D Graphics Programming. Courses.
Make your own smart watch : RetroWatch Android app. The performance of RetroWatch itself is limited, but I prepared some features to show various of data. The biggest feature is filtering messages sent to the watch. And I put an RSS feed feature to use data from different kind of areas. Try each feature by switching 4 tabs. Message list tab : Messages are the information collected from the app. Every message is inactivated except for emergency messages. Filter setting tab: The RetroWatch app controls every single information by filtering. RSS tab: You can register and monitor RSS feeds. Watch control tab: You are able to alter styles of the app and watch.
The RetroWatch app collects three kinds of data. Notification: A notification that is registered in the Andriod indicator bar. System info: The system info of the phone such as battery status, RF(LTE, 3G) connection status, WiFi status, recharging progress is collected in the watch. RSS feed: If you set RSS title and URL, it periodically read RSS data. Here are the other minor features. Python. Welcome to the new platform of Programmer's Heaven!
We apologize for the inconvenience caused, if you visited us from a broken link of the previous version. The main reason to move to a new platform is to provide more effective and collaborative experience to you all. Please feel free to experience the new platform and use its exciting features. Contact us for any issue that you need to get clarified. We are more than happy to help you. Discussion of all things Pythonic.