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  • Development costs of an indie multiplayer arcade shooter

    - by VorteX
    Me and a friend of mine have been wanting to remake one of our favorite games of all time (007: Nightfire) for a long time now. However, remaking a game likes this is really complicated because of the rights to the Bond-franchise. That site was created months ago, and by doing so we have found some great people (modelers, level designers, etc.) that want to help, but our plans have changed a little bit. Our current plan is to create a multiplayer-only remake of the original game, removing all the Bond-references so that the rights shouldn't be a problem anymore. We still want to create the game using the UDK and SteamWorks for both PC and Mac. Currently there's 3 things I need to find out: The costs of creating an arcade shooter like this. We want to use crowdfunding to fund the project. The best way to manage a project like this over the internet. Our current team consists of people all over the world, and we need a central place to discuss, collaborate and store our files. The best place to find suitable people for this project. We already have some modelers and level designers but we also need animators, artists, programmers, etc. I believe creating an arcade game like this with a small team is feasible. The game in a nutshell: ±10 maps, ±20 weapons, ±12 game modes, weapon/armor pickups, grapple hook gadget, no ADS, uses SteamWorks, online matchmaking, custom games, AI bots, appearance selection, level progression using XP (no unlocks), achievements. Does anyone know where to start? Any help is appreciated.

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  • Building the Ultimate SharePoint 2010 Development Environment

    - by Manesh Karunakaran
    It’s been more than a month since SharePoint 2010 RTMed. And a lot of people have downloaded and set up their very own SharePoint 2010 development rigs. And quite a few people have written blogs about setting up good development environments, there is even an MSDN article on it. Two of the blogs worth noting are from MVPs Sahil Malik and Wictor Wilén. Make sure that you check these out as well. Part of the bad side-effects of being a geek is the need to do the technical stuff the best way possible (pragmatic or otherwise), but the problem with this is that what is considered “best” is relative. Precisely the reason why you are reading this post now. Most of the posts that I read are out dated/need updations or are using the wrong OS’es or virtualization solutions (again, opinions vary) or using them the wrong way. Here’s a developer’s view of Building the Ultimate SharePoint 2010 Development Rig. If you are a sales guy, it’s time to close this window. Confusion 1: Which Host Operating System and Virtualization Solution to use? This point has been beaten to death in numerous blog posts in the past, if you have time to invest, read this excellent post by our very own SharePoint Joel on this subject. But if you are planning to build the Ultimate Development Rig, then Windows Server 2008 R2 with Hyper-V is the option that you should be looking at. I have been using this as my primary OS for about 6-7 months now, and I haven’t had any Driver issue or Application compatibility issue. In my experience all the Windows 7 drivers work fine with WIN2008 R2 also. You can enable Aero for eye candy (and the Windows 7 look and feel) and except for a few things like the Hibernation support (which a can be enabled if you really want it), Windows Server 2008 R2, is the best Workstation OS that I have used till date. But frankly the answer to this question of which OS to use depends primarily on one question - Are you willing to change your primary OS? If the answer to that is ‘Yes’, then Windows 2008 R2 with Hyper-V is the best option, if not look at vmWare or VirtualBox, both are equally good. Those who are familiar with a Virtual PC background might prefer Sun VirtualBox. Besides, these provide support for running 64 bit guest machines on 32 bit hosts if the underlying hardware is truly 64 bit. See my earlier post on this. Since we are going to make the ultimate rig, we will use Windows Server 2008 R2 with Hyper-V, for reasons mentioned above. Confusion 2: Should I use a multi-(virtual) server set up? A lot of people use multiple servers for their development environments - like Wictor Wilén is suggesting - one server hosting the Active directory, one hosting SharePoint Server and another one for SQL Server. True, this mimics the production environment the best possible way, but as somebody who has fallen for this set up earlier, I can tell you that you don’t really get anything by doing this. Microsoft has done well to ensure that if you can do it on one machine, you can do it in a farm environment as well. Besides, when you run multiple Server class machine instances in parallel, there are a lot of unwanted processor cycles wasted for no good use. In my personal experience, as somebody who needs to switch between MOSS 2007/SharePoint 2010 environments from time to time, the best possible solution is to Make the host Windows Server 2008 R2 machine your Domain Controller (AD Server) Make all your Virtual Guest OS’es join this domain. Have each Individual Guest OS Image have it’s own local SQL Server instance. The advantages are that you can reuse the users and groups in each of the Guest operating systems, you can manage the users in one place, AD is light weight and doesn't take too much resources on your host machine and also having separate SQL instances for each of the Development images gives you maximum flexibility in terms of configuration, for example your SharePoint rigs can have simpler DB configurations, compared to your MS BI blast pits. Confusion 3: Which Operating System should I use to run SharePoint 2010 Now that’s a no brainer. Use Windows 2008 R2 as your Guest OS. When you are building the ultimate rig, why compromise? If you are planning to run Windows Server 2008 as your Guest OS, there are a few patches that you need to install at different times during the installation, for that follow the steps mentioned here Okay now that we have made our choices, let’s get to the interesting part of building the rig, Step 1: Prepare the host machine – Install Windows Server 2008 R2 Install Windows Server 2008 R2 on your best Desktop/Laptop. If you have read this far, I am quite sure that you are somebody who can install an OS on your own, so go ahead and do that. Make sure that you run the compatibility wizard before you go ahead and nuke your current OS. There are plenty of blogs telling you how to make a good Windows 2008 R2 Workstation that feels and behaves like a Windows 7 machine, follow one and once you are done, head to Step 2. Step 2: Configure the host machine as a Domain Controller Before we begin this, let me tell you, this step is completely optional, you don’t really need to do this, you can simply use the local users on the Guest machines instead, but if this is a much cleaner approach to manage users and groups if you run multiple guest operating systems.  This post neatly explains how to configure your Windows Server 2008 R2 host machine as a Domain Controller. Follow those simple steps and you are good to go. If you are not able to get it to work, try this. Step 3: Prepare the guest machine – Install Windows Server 2008 R2 Open Hyper-V Manager Choose to Create a new Guest Operating system Allocate at least 2 GB of Memory to the Guest OS Choose the Windows 2008 R2 Installation Media Start the Virtual Machine to commence installation. Once the Installation is done, Activate the OS. Step 4: Make the Guest operating systems Join the Domain This step is quite simple, just follow these steps below, Fire up Hyper-V Manager, open your Guest OS Click on Start, and Right click on ‘Computer’ and choose ‘Properties’ On the window that pops-up, click on ‘Change Settings’ On the ‘System Properties’ Window that comes up, Click on the ‘Change’ button Now a window named ‘Computer Name/Domain Changes’ opens up, In the text box titled Domain, type in the Domain name from Step 2. Click Ok and windows will show you the welcome to domain message and ask you to restart the machine, click OK to restart. If the addition to domain fails, that means that you have not set up networking in Hyper-V for the Guest OS to communicate with the Host. To enable it, follow the steps I had mentioned in this post earlier. Step 5: Install SQL Server 2008 R2 on the Guest Machine SQL Server 2008 R2 gets installed with out hassle on Windows Server 2008 R2. SQL Server 2008 needs SP2 to work properly on WIN2008 R2. Also SQL Server 2008 R2 allows you to directly add PowerPivot support to SharePoint. Choose to install in SharePoint Integrated Mode in Reporting Server Configuration. Step 6: Install KB971831 and SharePoint 2010 Pre-requisites Now install the WCF Hotfix for Microsoft Windows (KB971831) from this location, and SharePoint 2010 Pre-requisites from the SP2010 Installation media. Step 7: Install and Configure SharePoint 2010 Install SharePoint 2010 from the installation media, after the installation is complete, you are prompted to start the SharePoint Products and Technologies Configuration Wizard. If you are using a local instance of Microsoft SQL Server 2008, install the Microsoft SQL Server 2008 KB 970315 x64 before starting the wizard. If your development environment uses a remote instance of Microsoft SQL Server 2008 or if it has a pre-existing installation of Microsoft SQL Server 2008 on which KB 970315 x64 has already been applied, this step is not necessary. With the wizard open, do the following: Install SQL Server 2008 KB 970315 x64. After the Microsoft SQL Server 2008 KB 970315 x64 installation is finished, complete the wizard. Alternatively, you can choose not to run the wizard by clearing the SharePoint Products and Technologies Configuration Wizard check box and closing the completed installation dialog box. Install SQL Server 2008 KB 970315 x64, and then manually start the SharePoint Products and Technologies Configuration Wizard by opening a Command Prompt window and executing the following command: C:\Program Files\Common Files\Microsoft Shared Debug\Web Server Extensions\14\BIN\psconfigui.exe The SharePoint Products and Technologies Configuration Wizard may fail if you are using a computer that is joined to a domain but that is not connected to a domain controller. Step 8: Install Visual Studio 2010 and SharePoint 2010 SDK Install Visual Studio 2010 Download and Install the Microsoft SharePoint 2010 SDK Step 9: Install PowerPivot for SharePoint and Configure Reporting Services Pop-In the SQLServer 2008 R2 installation media once again and install PowerPivot for SharePoint. This will get added as another instance named POWERPIVOT. Configure Reporting Services by following the steps mentioned here, if you need to get down to the details on how the integration between SharePoint 2010 and SQL Server 2008 R2 works, see Working Together: SQL Server 2008 R2 Reporting Services Integration in SharePoint 2010 an excellent article by Alan Le Marquand Step 10: Download and Install Sample Databases for Microsoft SQL Server 2008R2 SharePoint 2010 comes with a lot of cool stuff like PerformancePoint Services and BCS, if you need to try these out, you need to have data in your databases. So if you want to save yourself the trouble of creating sample data for your PerformancePoint and BCS experiments, download and install Sample Databases for Microsoft SQL Server 2008R2 from CodePlex. And you are done! Fire up your Visual Studio 2010 and Start Coding away!!

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  • Game Center alternatives for non-iOS development

    - by Eat at Joes
    I have completed a game for iOS which integrates GameKit. I am happy with Game Center however my game also has an HTML5 web version and will soo have an Android version. My question is what alternatives do I have for non-iOS platforms but primarily for Android and to a lesser extent a Javascript/Web SDK. I looked at Openfeint a year ago and it seemed to be a good solution back then but am not sure if this is still the case? Note, I have no plans to replace what I already have in my iOS game and I understand the leader boards, users, and achievements won't be shared out of Game Center.

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  • Android development in Unreal with an existing project

    - by user1238929
    I am currently using an Unreal 3 project that has been targeted for multiple devices. Originally, it was targeted for iOS and now I want to try and build it for Android. The project is capable of doing it and I am in the process of testing it. I think I have everything I need in order to build it and launch it for an android device that I have set up and connected to my PC and is recognized by the Android SDK ABD. I am currently trying to build and launch the game through the Unreal Frontend but when I try, I am getting stuck at getting the Unreal Frontend to find my Android device as a platform to debug, like it would with a PC, Xbox360, or PS3. Right now, I am just trying to launch the game to see if I can get it to simply run on an Android device, I'm going to worry about the packaging later. So I have two questions: Am I on the right track in looking at the Unreal Frontend to cook and launch the project on Android or should I look somewhere else? How do I get Unreal to recognize my Android device as a platform to launch on? I would even settle for recognizing an emulator, but that seems even harder.

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  • Is using MultiMaps code smell? If so what alternative data structures fit my needs?

    - by Pureferret
    I'm trying to model nWoD characters for a roleplaying game in a character builder program. The crux is I want to support saving too and loading from yaml documents. One aspect of the character's is their set of skills. Skills are split between exactly three 'types': Mental, Physical, and Social. Each type has a list of skills under if. My Yaml looks like this: PHYSICAL: Athletics: 0 Brawl: 3 MENTAL: Academics: 2 Computers My initial thought was to use a Multimap of some sort, and have the skill type as an Enum, and key to my map. Each Skill is an element in the collection that backs the multimap. However, I've been struggling to get the yaml to work. On explaining this to a colleague outside of work they said this was probably a sign of code smell, and he's never seen it used 'well'. Are multiMaps really code smell? If so what alternate data structures would suit my goals?

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  • HTML5 mobile game development vs. native game apps

    - by Vic Szpilman
    What is the current state of game engines, frameworks, libraries and conversions related to the HTML5 set of technologies (including CSS3 and JavaScript libraries such as RaphaelJS, Impact, gameQuery); and how does the best of that compare with developing a native app (especially for iOS and Android)? Especially in terms of performance, visuals and getting that "native feel". Thoughts on solutions such as Appcelerator and Corona SDK are also appreciated. In regards to Unity3D, is it possible to develop in it and still have the game be playable on a browser (such as current releases of Chrome or Firefox, at least) without any dependencies or having the user install anything (no unity web player). What I'm looking for is how to develop in web standards as to reach the maximum number of platforms (including outside mobile) while still retaining a native experience for mobile without having to implement the game anew for iOS and Android.

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  • Good Freelance models for web developers

    - by Matthew Underwood
    I am a web developer with four years of experience in PHP, MYSQL and experience in Javascript etc. One day I hope to develop a freelance career in web development. Areas of freelance that I am thinking of going towards includes Wordpress, Magento development along with bespoke applications. I am also thinking of doing some consultancy work for clients and businesses when I build up some more experience and technical knowledge. I want to offer a web development service to potential clients that plays on my strengths in what I know but most importantly has a market. Web development can cover so many subjects that its difficult to pick out the areas that have demand. I am also curious to find out if web developers offer services that bring in a monthly income e.g application maintenance or database maintenance? Is there a market for certain areas like WordPress plugins or bespoke applications? Are there certain things to avoid because of work duration, unrealistic client expectations or the fact that its impossible to find a market for it? As professional and experienced freelance web developers have you learned some important do's and don'ts? Is there certain services that the majority of web developers offer because its in high demand? This is the one area of web development freelancing that I cant get my head around. I know there is never a definitive answer but there must be some good practises and general consensus on this subject. Web designers design websites they offer a lump sum and get paid monthly sometimes to add new content, PPC and SEO consultants market sites to the top this will involve monthly payments, web development doesn’t seem so clear cut.

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  • How do I encrypt the source code on the webserver?

    - by Ashin k n
    I have a web application developed using Python, HTML, CSS & JavaScript. The customer installs it in any of their own Machine and uses it through their LAN. In short the customer sets up the webserver in any of their own machine. Since its a web application, all the source code is open for the customer in the document root directory of webserver. I want to encrypt the whole source code in the document root directory in such a way that it should not effect the working of the web application. Is there is any way to encrypt the Python, HTML, CSS & JavaScript for this purpose.

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  • Why are many programmers moving their code to github?

    - by Chibueze Opata
    For the past 6 months or more, I've been seeing many codes hosted at sourceforge.net as well as other hosting sites "Move to GitHub". A mere Google Search with the phrase "Moved to Github" returns several results containing the text moved to github. This is very confusing for me, and I'm wondering, why exactly are people moving? Does it mean that GitHub is better or is there some special advantage I'm not seeing?

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  • Naming the Weapons and Designing Weapons Based in Real-life During Game Development [duplicate]

    - by David Dimalanta
    This question already has an answer here: Do you need a license for weapon models? 6 answers Is it legit or copyright safe if I name the actual name of the gun model such as AK-47, M16, Remington 870, and so on? I'm on the works for making a simple 2D 3rd-person shooter game. One of the examples is the Counter Strike and the game listed the name of weapons based on the real life models and so developers decided to created this named it for the weapon designs. If not, should I make either falsify the name of weapons (e.g. 9mm instead of Glock 17 from a Syphon Filter game) or make fictional weapons like the ones developed behind Halo games?

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  • Career in Game Development

    - by cantbereached
    Hello, I currently study computer engineering and I want to lead my career towards game industry which I always want to be a part of. But I am not sure where to start. I applied some of the companies in the industry for internship and so but most of them wants experience and some work in game developing. Many asks whether I developed a simple game or something similar which I haven't done so far. I am proficient at C, C++, Java, JS, HTML etc. Any tips from people experienced in the industry on where to start ?

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  • How to begin in Game Development? [closed]

    - by Bladimir Ruiz
    It's been a while since I decide to get into game dev, but, there are so many ways to make a game, that i dont know where to begin, I got unity 3d license for PC/Android/Ios for free, but i Also got XNA dev tool, ALSO have CoronaSDK.. But I dont Know wich one to use. Till' now all i want is to make a Sidecroller lime Super Mario Bros, Just for start later on, i will like to make diferent games. In the future i would like to work in the game industry which tools will be the best to Start in that "Dream"?

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  • Using C++11 for cross-platform Game Engine Development

    - by Samaursa
    Note: This is not a 'give your opinion' question about C++03 and C++11. Our game engine, written in C++03, is designed to be compiled on Windows, OSX and iOS. Linux support is planned for the (very) near future. Our experience is limited when it comes to consoles, which is why I am asking this question. Currently, we are debating whether switching to C++11 and using non-compatible features of the C++11 standard could pose a problem in the near future when we need to port our engine to any of the current gen consoles (perhaps the compilers supported by some console(s) do not support C++11 yet? We don't know...). So, game developers who have experience across multiple platforms and consoles, do you think we should stick to C++03 until the new generation of consoles arrive and most everybody has switched to C++11 standard (have they already?). Or are most consoles using/support compilers (VC++, GCC or variants?) that are already supporting C++11 features?

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  • I want to learn the basics of Game Development [on hold]

    - by Mary
    I have programming experience and I would like to know how to start building games. I'm interested in building games for desktops and Android tablets. Could you list the general steps of Game Building? From the more common programming languages used to the software and frameworks available at each stage? I'm just trying to get the big picture of all the different options and tools I have at my disposal. Please leave some book recommendations and useful links!

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  • How to understand Linux kernel source code for a beginner?

    - by Amit Chavan
    Hi, I am a student interested in working on Memory Management, particularly the page replacement component of the linux kernel. What are the different guides that can help me to begin understanding the kernel source? I have tried to read the book Understanding the Linux Virutal Memory Manager by Mel Gorman and Understanding the Linux Kernel by Cesati and Bovet, but they do not explain the flow of control through the code. They only end up explaining various data structures used and the work various functions perform. This makes the code more confusing. My project deals with tweaking the page replacement algorithm in a mainstream kernel and analyse its performance for a set of workloads. Is there a flavor of the linux kernel that would be easier to understand(if not the linux-2.6.xx kernel)?

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  • What if you don't have code samples to give a prospective employer?

    - by lucks
    What do you do when you don't have any good code samples available when asked by a prospective employer? I like to consider myself a fairly capable developer but I can't share any of the software I've been writing for my company the last few years. Unfortunately, I haven't been able to find the time to put much work in my personal projects either. Basically, I don't think I can find any code samples that are a good representative of my skills that I can share. Any ideas? Thanks in advance.

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  • What is the politically correct way of refactoring other's code?

    - by dukeofgaming
    I'm currently working in a geographically distributed team in a big company. Everybody is just focused on today's tasks and getting things done, however this means sometimes things have to be done the quick way, and that causes problems... you know, same old, same old. I'm bumping into code with several smells such as: big functions pointless utility functions/methods (essentially just to save writing a word), overcomplicated algorithms, extremely big files that should be broken down into different files/classes (1,500+ lines), etc. What would be the best way of improving code without making other developers feel bad/wrong about any proposed improvements?

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  • Council for the Development of a jumping game!

    - by Esteban Quintero
    I want to create platforms on the stage, where a sprite is jumping on them. something like this http://itunes.apple.com/es/app/doodle-jump-cuidado-extremadamente/id307727765?mt=8 I would like some guidance to do so. 1) what is the best way to simulate the jump? (Velocity or EnityModifier) 2) as platforms rabdom I can generate, with no overlap? 3) should move the camera or the sprites of the stage?

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  • What C++ libraries can be used in game development [closed]

    - by RedShft
    I'm currently in the planning stage for my next game, and since I've been away from C++ for a while I have some questions about helpful libraries. I plan on making a 2D game with SDL, constructing my own simple 2D engine. I plan on making this game for the PC. What libraries would you recommend to make this process easier? What about unittests? What about an enforce operator to throw exceptions? int a = 1; enforce(a == 2); //Throws an exception, Specifically, i'm looking for general purpose libraries, that implement that make my life easier (like boost). Also, a helpful library for physics/collision, AI, XML file parsing (specifically working with the Tiled map editor), and any others that you guys have used that are useful in a 2D game.

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  • Which is more important in a web application code promotion hierarchy? production environment to repo equivalence or unidirectional propagation?

    - by ghbarratt
    Lets say you have a code promotion hierarchy consisting of several environments, (the polar end) two of which are development (dev) and production (prod). Lets say you also have a web application where important (but not developer controlled) files are created (and perhaps altered) in the production environment. Lets say that you (or someone above you) decided that the files which are controlled/created/altered/deleted in the production environment needed to go into the repository. Which of the following two sets of practice / approaches do you find best: Committing these non-developed file modifications made in the production environment so that the repository reflects the production environment as closely and as often as possible. Generally ignoring the non-developed production environment alterations, placing confidence in backups to restore the production environment should it be harmed, and keeping a resolution to avoid pushing developments through the promotion hierarchy in the reverse direction (avoiding pushing from prod to dev), only committing the files found in the production environment if they were absolutely necessary in other environments for development. So, 1 or 2, and why? PS - I am currently slightly biased toward maintaining production environment to repository equivalence (option 1), but I keep an open mind and would accept an answer supporting either.

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  • Non-Obvious Topics to Learn for Game Development

    - by ashes999
    I've been writing games for around 10 years now (from QBasic to C# and everything in-between). I need to start stretching my skills into different areas. What are other, surprising topics I should read up on? Expected topics would include the usual suspects: Programming language of your choice Scripting language Source control Project management (or Agile) Graphics API Maybe some AI (A* path-finding?) Physics (projectile physics) Unit testing (automated testing) I'm looking for more esoteric topics; things that you don't expect to need to know, but if you do know them, they make a difference. This could include things like: Art skills (drawing, lighting, colouring, layout, etc.) Natural language processing The physics of sound (sound-waves, doppler effect, etc.) Personally, I feel that having technical art skills (eg. can make decent art-work if you can only come up with ideas; or, following Photoshop/GIMP tutorials) was the most beneficial for me. This is not intended to be an open-ended question; I'm looking for specific skills that helped you and you expect will continue to benefit you in the short- and long-term.

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  • Web Development Goes Pre-Visual InterDev

    - by Ken Cox [MVP]
    As a longtime and hardcore ASP.NET webforms developer, I’m finding the new client-side development world a bit of a grind.  I love learning new technologies, but I can’t help feeling we’ve regressed and lost our old RAD advantage as we move heavy lifting to the client. For my latest project, I’m using Telerik’s KendoUI in Visual Studio 2012. To say I feel clumsy writing this much JavaScript is an understatement. It seems like the only safe way to ‘write’ this code is by copying a working snippet from someone else and pasting it into my HTML page.  For me, JavaScript has largely been for small UI tasks like client-side validation and a bit of AJAX – and often emitted by a server-side control. I find myself today lost in nests of curly braces that Ctrl+K, Ctrl+D doesn’t seem to understand that well either. IntelliSense, my old syntax saviour, doesn’t seem to have kept up with this cobweb of code either. Code completion? Not seeing it. As I fumbled about this evening, I thought about how web development rocketed forward when Microsoft introduced Visual InterDev. Its Design-Time Controls (DTCs) changed the way we created sites. All the iterations of Visual Studio have enhanced that server-side experience where you let a tool write the bulk of the code and manually finesse it from there. What happened? Why am I typing  properties and values (especially default values!) into VS 2012 to get a client-side grid on a page? Where are the drag and drop objects that traditionally provided 70 percent of the mark-up and configuration?  Did we forget how to write Property Pages where you enter a value and the correct syntax appears magically in the source code? To me, the tooling was looking the other way as the scene shifted from server-side code to nimble client-side script. It’ll have to catch up. Although JavaScript is the lingua franca of web browsers, the language is unwieldy, tough to maintain, and messy to debug. If a .NET JIT compiler can turn our VB, F#, and C# source code into an Intermediate Language that executes on a computer, I don’t see why there can’t be a client-side compiler that turns a .NET language into JavaScript that browsers can consume.

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  • C: What is a good source to teach standard/basic code conventions to someone newly learning the language ?

    - by shan23
    I'm tutoring someone who can be described as a rank newcomer in C. Understandably, she does not know much about coding conventions generally practiced, and hence all her programs tend to use single letter vars, mismatched spacing/indentation and the like, making it very difficult to read/debug her endeavors. My question is, is there a link/set of guidelines and examples which she can use for adopting basic code conventions ? It should not be too arcane as to scare her off, yet inclusive enough to have the basics covered (so that no one woulc wince looking at the code). Any suggestions ?

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  • What's the best way to create a static utility class in python? Is using metaclasses code smell?

    - by rsimp
    Ok so I need to create a bunch of utility classes in python. Normally I would just use a simple module for this but I need to be able to inherit in order to share common code between them. The common code needs to reference the state of the module using it so simple imports wouldn't work well. I don't like singletons, and classes that use the classmethod decorator do not have proper support for python properties. One pattern I see used a lot is creating an internal python class prefixed with an underscore and creating a single instance which is then explicitly imported or set as the module itself. This is also used by fabric to create a common environment object (fabric.api.env). I've realized another way to accomplish this would be with metaclasses. For example: #util.py class MetaFooBase(type): @property def file_path(cls): raise NotImplementedError def inherited_method(cls): print cls.file_path #foo.py from util import * import env class MetaFoo(MetaFooBase): @property def file_path(cls): return env.base_path + "relative/path" def another_class_method(cls): pass class Foo(object): __metaclass__ = MetaFoo #client.py from foo import Foo file_path = Foo.file_path I like this approach better than the first pattern for a few reasons: First, instantiating Foo would be meaningless as it has no attributes or methods, which insures this class acts like a true single interface utility, unlike the first pattern which relies on the underscore convention to dissuade client code from creating more instances of the internal class. Second, sub-classing MetaFoo in a different module wouldn't be as awkward because I wouldn't be importing a class with an underscore which is inherently going against its private naming convention. Third, this seems to be the closest approximation to a static class that exists in python, as all the meta code applies only to the class and not to its instances. This is shown by the common convention of using cls instead of self in the class methods. As well, the base class inherits from type instead of object which would prevent users from trying to use it as a base for other non-static classes. It's implementation as a static class is also apparent when using it by the naming convention Foo, as opposed to foo, which denotes a static class method is being used. As much as I think this is a good fit, I feel that others might feel its not pythonic because its not a sanctioned use for metaclasses which should be avoided 99% of the time. I also find most python devs tend to shy away from metaclasses which might affect code reuse/maintainability. Is this code considered code smell in the python community? I ask because I'm creating a pypi package, and would like to do everything I can to increase adoption.

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  • Is code like this a "train wreck" (in violation of Law of Demeter)?

    - by Michael Kjörling
    Browsing through some code I've written, I came across the following construct which got me thinking. At a first glance, it seems clean enough. Yes, in the actual code the getLocation() method has a slightly more specific name which better describes exactly which location it gets. service.setLocation(this.configuration.getLocation().toString()); In this case, service is an instance variable of a known type, declared within the method. this.configuration comes from being passed in to the class constructor, and is an instance of a class implementing a specific interface (which mandates a public getLocation() method). Hence, the return type of the expression this.configuration.getLocation() is known; specifically in this case, it is a java.net.URL, whereas service.setLocation() wants a String. Since the two types String and URL are not directly compatible, some sort of conversion is required to fit the square peg in the round hole. However, according to the Law of Demeter as cited in Clean Code, a method f in class C should only call methods on C, objects created by or passed as arguments to f, and objects held in instance variables of C. Anything beyond that (the final toString() in my particular case above, unless you consider a temporary object created as a result of the method invocation itself, in which case the whole Law seems to be moot) is disallowed. Is there a valid reasoning why a call like the above, given the constraints listed, should be discouraged or even disallowed? Or am I just being overly nitpicky? If I were to implement a method URLToString() which simply calls toString() on a URL object (such as that returned by getLocation()) passed to it as a parameter, and returns the result, I could wrap the getLocation() call in it to achieve exactly the same result; effectively, I would just move the conversion one step outward. Would that somehow make it acceptable? (It seems to me, intuitively, that it should not make any difference either way, since all that does is move things around a little. However, going by the letter of the Law of Demeter as cited, it would be acceptable, since I would then be operating directly on a parameter to a function.) Would it make any difference if this was about something slightly more exotic than calling toString() on a standard type? When answering, do keep in mind that altering the behavior or API of the type that the service variable is of is not practical. Also, for the sake of argument, let's say that altering the return type of getLocation() is also impractical.

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