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• OpenShift : la compilation des applications Java dans le Cloud désormais possible, Red Hat étend sa plateforme PaaS

  OpenShift : le développement et la compilation des applications Java dans le Cloud désormais possible Red Hat étend sa plateforme PaaS Red Hat vient d'étendre sa plateforme d'hébergement Cloud OpenShift, qui peut désormais être utilisée non seulement pour déployer des applications, mais également pour développer des projets en utilisant le Cloud. OpenShift est une solution PaaS (Platform as a Service) qui avait été lancée en mai dernier par par Red Hat pour les développeurs open source, afin de concurrencer Windows Azure et Google App Engine. La plateforme permet d'héberger et exécuter des applications en Java, Ruby, Python, PHP et Perl. OpenShift supporte les bas...

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• What does it mean to "have experience with the Unix/Linux command line"? [closed]

  - by Aerovistae

  I'm a new comp sci grad applying to jobs, and this requirement confuses me, especially since the job description (Python back-end developer) says it's the single most important thing ("Everything else we can teach you!") I mean, I know how to use the command line... I know your standard run-of-the-mill stuff like navigating around and manipulating files and permissions and using pipes and running applications, but what are they looking for when they say something like that? I'm aware there's no end to what you can do with the command line, but I was under the impression that after a certain point it's the sort of thing that only benefits server/system administrators.

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• Is C++ really a bad language for beginners? [duplicate]

  - by Chris

  This question already has an answer here: Is C++ suitable as a first language? 24 answers I'm learning C++ right now, and it's the first language I'm learning. I keep seeing on stackexchange and other forums (Reddit, etc.) that I should drop C++ and learn a higher level language like Python or Java. The only arguments I see are that "C++ is harder to learn and is more low-level than others." which don't really give a reason NOT to learn it. I want to know if there are any actual reasons for dropping C++ and taking up another, "easier" language. Or if I should keep focusing on it, and just learn others later (which is what I plan on doing).

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• Ready to Open source the software, but want to make some money out of it.

  - by byteofprash

  I'm an UG Student and an Entrepreneur. I have started a small company with which I'm trying to provide solutions, to various companies in my city, through my software. I put in 30-40 hours of coding and development. I've been a huge fan of Open Source projects and I've also built by software on python. But now when it comes to selling my software to my customers, I expect money. (Am I being a Hypocrite?) Is there any OSS license under which I can make money and also make my source open? Please suggest. Or any other way to make money with my softwares? (I guess I deserve some credit. If not the code, atleast the ideas? :D )

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• DOMDocument programming: a lot of little dilemmas, how to solve them?

  - by Peter Krauss

  I need elegance and performance: how to decide by the "best implementation" for each DOM algorithm that I face. This simple "DOMNodeList grouper" illustrate many little dilemmas: use iterator_to_array or "populate an array", when not all items need to be copied. use clone operator, cloneNode method or import method? use parentNode::method() or documentElement::method? (see here) first removeChild or first replaceChild, no avoids "side effects"? ... My position, today, is only "do an arbitrary choice and follow it in all implementations" (like a "Convention over configuration" principle)... But, there are another considerations? About performance, there are some article showing benchmarks? PS: this is a generic DOM question, any language (PHP, Javascript, Python, etc.) have the problem.

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• DRY, string, and unit testing

  - by Rodrigue

  I have a recurring question when writing unit tests for code that involves constant string values. Let's take an example of a method/function that does some processing and returns a string containing a pre-defined constant. In python, that would be something like: STRING_TEMPLATE = "/some/constant/string/with/%s/that/needs/interpolation/" def process(some_param): # We do some meaningful work that gives us a value result = _some_meaningful_action() return STRING_TEMPLATE % result If I want to unit test process, one of my tests will check the return value. This is where I wonder what the best solution is. In my unit test, I can: apply DRY and use the already defined constant repeat myself and rewrite the entire string def test_foo_should_return_correct_url(): string_result = process() # Applying DRY and using the already defined constant assert STRING_TEMPLATE % "1234" == string_result # Repeating myself, repeating myself assert "/some/constant/string/with/1234/that/needs/interpolation/" == url The advantage I see in the former is that my test will break if I put the wrong string value in my constant. The inconvenient is that I may be rewriting the same string over and over again across different unit tests.

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• Is there a language offering LISP-like macros with a more complex syntax?

  - by blubb

  LISP's macros are extremely powerful constructs, and the inability to introspect and modify the program itself beyond the method signature level has always struck me as a limitation. Yet I favour "complex" syntax because it tends to be closer to natural language. So far I have failed to find a language which combines a powerful macro mechanism such as LISP's with a naturally looking syntax (1). Is anyone aware of such a language? Footnote: I would consider python to have a naturally looking syntax as it allows constructs like this: if 0 < a < 5 and b in list. The avoidance of braces to structure blocks is irrelevant in this case, though.

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• How would you approach developers you don't already know as a developer to offer them a position? [closed]

  - by Kit Sunde

  We've been trying to find a second developer for the company and have posted job ads online but so far there have been no developers that have been interested, and only a single one that has some experience in Python (that failed a fairly basic practical). It seems like the it's really difficult to find decent people here in Singapore, even reasonable juniors that you can teach. I'm contemplating whether I should go reach out directly to people on Stack Overflow and github and in the hopes that they are interested. I'm thinking I would message the person with only a few sentences, stating the they seems capable from their online presence and that I'd like to work with them. Is this kosher? I know I dislike recruiters and unsolicited mail just as much as the next guy.

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• How do operating systems… run… without having an OS to run in?

  - by Plazmotech Binary

  I'm really curious right now. I'm a Python programmer, and this question just boggled me: You write an OS. How do you run it? It has to be run somehow, and that way is within another OS? How can an application run without being in an OS? How do you tell the computer to run, say, C, and execute these commands to the screen, if it doesn't have an OS to run in? Does it have to do with a UNIX kernel? If so, what is a Unix kernel, or a kernel in general? I'm sure OSes are more complicated than that, but how does it work?

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• Assemble static site from templates? (don't want to reinvent the wheel)

  - by raindog308

  I have a site that is 100% static content (no php, just some javascript). There's several "blocks" like the header, menu, footer, etc. that are the same on each page. Rather than do a lot of copy/pasting, I was thinking of some kind of template system where I could run a CLI command (in php, perl, python, shell, whatever) and have it replace all the block tags with the actual block text. I did see some answers in this question, but those seem oriented towards "we provide the style and layout, you provide the text". In my case, I have everything as far as layout, css, etc. - just want to do a glorified sed. Before I invent the wheel, I was wondering if there was a tool out there already.

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• Language-independent sources on 2D collision detection [on hold]

  - by Phazyck

  While making a Pong clone with a friend, we had to implement some 2D collision detection. For research purposes, my friend dug up a book called "AdvancED Game Design with Flash" by Rex Van Der Spuy. This book was clearly targeted at implementing 2D collision detection in ActionScript, and I also have some problems with how the concepts are presented, e.g. presenting one method as better than another, without explaining that decision. Can anyone recommend some good material on 2D collision detection? I'd prefer it if it kept the implementation details as language-independent as possible, e.g. by implementing the concepts in pseudo-code. Language-specific materials are not completely unwelcome though, though I'd prefer those to be in either Java, C#, F# or Python or similar languages, as those are the ones I'm most familiar with. :-) Lastly, is there perhaps widely known and used book on collision detection that most people should know about, like a 'the book on 2D collision detection'?

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• Is it viable to become a contract programmer straight out of college?

  - by M G

  I have a Bachelor of Science in Computer Science and four months research experience designing and implementing a research project. I realize this is highly dependent on my skill set - which includes C, C++, Java, Python, and SQL. I feel I have an advantage in two ways: I am young and am not afraid to work overtime. I am willing to take lower pay to gather a client base/experience, and work nights/weekends to get a few projects under my belt. This may be cliche, but I feel that I can learn new technologies quicker than most. At the very least, I am not a slow study. With this being said, is it viable for me to become a contract programmer? Or do I need the 10+ year skill set that most contractors bring to the table?

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• Why is Prolog associated with Natural Language Processing?

  - by kyphos

  I have recently started learning about NLP with python, and NLP seems to be based mostly on statistics/machine-learning. What does a logic programming language bring to the table with respect to NLP? Is the declarative nature of prolog used to define grammars? Is it used to define associations between words? That is, somehow mine logical relationships between words (this I imagine would be pretty hard to do)? Any examples of what prolog uniquely brings to NLP would be highly appreciated.

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• what's the overhead when allocating objects/arrays in Java?

  - by Gnijuohz

  How many bytes an array occupies in Java? Assume It's a 64bit machine and also assume there are N elements in an array, so all these elements would take up 2*N, 4*N or 8*N bytes for different types of array. And a lecture in Coursera says that it would occupy 2*N+24, 4*N+24 or 8*N+24 bytes for a N element array and the 24 byte is called overhead, but didn't explain it. Also objects have overheads, which is 16 bytes. What exactly are these overheads? Also, do these overheads only exist in Java? How about C, C++ and Python?

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• A question on choosing the next programming language between C/C++ and other languages

  - by SidCool

  I am a java developer (web app and standalone applications) who knows JavaScript, HTML, CSS and has mostly worked on Web applications. I have no knowledge of C/C++ or any other lower level languages. I feel like I should strengthen my CS basics by learning a fundamental language. Should it be C or C++? I am also inclined to learn Objective-C. Does it need basics of C or C++? Or should I go for new languages like Python, Google's Go etc. I know this is a cliche question asked very frequently, but I can use some help here.

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• how to install gerix on ubuntu 12.04 using backtrack repositories?

  - by werever

  I got instructions from here, and I found several sites with similar instructions but somethig is wrong with the repositories on 12.04. This should work for 11.10 and previous versions. Any ideas how to install backtrack repos and some back track apps on 12.04? I read about downloading the .deb package for gerix and manually making the same folder structure that gerix uses on backtrack, then manually run the python script, but this way didn't work for me either. How can I get gerix installed and working on my Ubuntu 12.04 system?

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• Is it normal to feel bad when someone insults a programming language? [closed]

  - by iammilind

  Few examples before the question: "A language is just a tool; Better to worry only about the concept." "C++ is just an object oriented language." "Java is more about the libraries and less about programming." "C# is just a Microsoft's version of Java with some extra things from C++." "Python is a scripting language used mainly for testing purpose." ... All these statements are made knowingly or unknowingly from my colleagues/friends and I often get to hear them. I feel bad when someone brings down any programming language. I don't know how to respond. Is there any one liner to enlighten those people?

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• Creating a simple 2d game with C++: Where to go first? [on hold]

  - by Lucas Vieira

  I'm starting to build a little school project. (I have a prior experience with php, python and java, and i'm learning c++ now). My part is simple, create a game, like this pong http://www.ponggame.org/ The problem is that I've never programmed a game before. I was looking the possibilities, maybe use QT? Or is there other library better for my case? Since i don't want to reinvent the wheel, where to start with? Thank you, guys!

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• Deleted files not increasing available free space on Ubuntu (as reported by df -h)

  - by Homunculus Reticulli

  I am writing data munging scripts (python and bash), to munge data and import large quantities of text files into a database. I am currently in the test phase, so I am generating several K's of files and deleting them (the files consume about 20G of space). After a test run, I delete the files (sometimes without having imported into the database). I notice that there is a steady decrease in the amount of free space on my disk (as reported by df -h). I don't understand this, as I use rm * (in the data directory), and in the cases where I use Nautilus, I empty the Trash bin as well. Similarly, I notice that when I import the data into the (postgresql) database, and then delete the data from the tables using DELETE FROM tablename;, the size consumed in the postgresql data directory does not go down either. Currently, I have lost approximately 200G from hard drive, and I need to reclaim that - but don't know what to do to reclaim it - any ideas?. I am running Ubuntu 10.0.4 LTS + postgresql 8.4

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• Credit Card Payment Processing which APIs do you use?

  - by user3330840

  It's for a Point of Sale Terminal where the customer will bring the physical credit card and it will be swiped through the terminal. The business has a merchant account on some banks. So, how do I start accepting credit cards in my app? The credit cards that needs to be accepted include: visa, master-card, amex, discover. Which APIs do I need to use? The programming language doesn't matter it can be in any programming languages Java/C#/C++/Python or anything. Will there be a single API or multiple APIs that need to be integrated? (I know some about PCI compliance and security encryption)

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• 1 year to learn as much as possile - How would you plan this time?

  - by user1189880

  I have been messing around with web development and programming in general for a couple of years now, working in web development agencies and the like. I have now decided that I want to move to more general programming and do this permanently and as a career and have set myself a goal of 1 year to learn as much as I can before I go out and find a 'proper' job as a programmer. Do any programmers out there have any opinions on how this time should be split and what the most important things to focus on will be over the year. The languages I will be focusing my learning on are: c, php, python and go - all of which i have varying degrees of familiarity with. The ultimate goal here is to gain as good as foundation as possible and to be of a good enough level to interview successfully for a decent company.

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• How far can you get in iOS without learning PhotoShop or another graphic design program? [on hold]

  - by Aerovistae

  I'm in the process of learning iOS, and I'm coming from a web dev background where CSS controls 70-90% of the UI, and Python/C++ desktop dev where there are highly customizable UI toolkits for most things. I'm trying to figure out how people make good-looking apps without graphic design skills. You always hear about some 8 year old or 14 year old who made a successful app. So I assume that even if the required code was relatively basic, the app must have looked good if it was a success. But I find it really unlikely that these kids have advanced PhotoShop skills as well as having learned iOS programming at such a young age. Frankly, the same goes for most independent app developers....as they say, unicorns don't exist. So what's the deal? Can you make a good-looking, market quality app without those skills? What are the limitations?

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• App Engine: Easier auth with OAuth2Decorator

  App Engine: Easier auth with OAuth2Decorator Here on the App Engine team, we're always trying to make it easier to call Google APIs from within your application. Using the library google-api-python-client, API calls can be a breeze, but performing authentication and authorization can sometimes (often?) take 50% of development time! We'll show how to get up and running with OAuth2Decorator to make auth as easy as the rest of the library. From: GoogleDevelopers Views: 0 0 ratings Time: 00:00 More in Science & Technology

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• virt-manager not installing

  - by Registered User

  I am trying to install virt-manager on 11.10 on 64 bit machine sudo aptitude install virt-manager here is where it stopped the install Processing triggers for python-support ... Errors were encountered while processing: libvirt-bin E: Sub-process /usr/bin/dpkg returned an error code (1) A package failed to install. Trying to recover: Setting up libvirt-bin (0.9.2-4ubuntu15) ... useradd: cannot lock /etc/passwd; try again later. adduser: `/usr/sbin/useradd -d /var/lib/libvirt -g kvm -s /bin/false -u 118 libvirt-qemu' returned error code 1. Exiting. dpkg: error processing libvirt-bin (--configure): subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: libvirt-bin What should be done in this case to resolve it?

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• STL for games, yea or nay?

  - by munificent

  Every programming language has its standard library of containers, algorithms, and other helpful stuff. With languages like C#, Java, and Python, it's practically inconceivable to use the language without its standard lib. Yet, on many C++ games I've worked on, we either didn't use the STL at all, used a tiny fraction of it, or used our own implementation. It's hard to tell if that was a sound decision for our games, or one simply made out of ignorance of the STL. So... is the STL a good fit or not?

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