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• Continuous Retraining Tutorials

  - by foampile

  I am looking for an online resource in which you can sortof design your future professional profile and it would provide you a set of tutorials that you would complete to get a basic level of familiarity with related technologies. One of my professional problems is my learning style: I can learn either by direct hands-on experience OR by following a rigid training program that goes in a linear progression. I have a hard time learning things in a multidimensional environment where the biggest challenge is to determine what needs to be learned and how to pick from a ton of books and the least problem is to go through the actual material. So I am looking for a reputable source that will knock those two confusing questions out for me so I can kick back and continuously be upgrading my skills without having to worry about what and how myself. I have found some decent online tutorials for various technologies but never found a single place that has all or most developer education tutorials that all follow the same or similar interface. I am kindof a lazy learner and would rather follow confirmed learning steps than be figuring my own education path just to realize I did it all wrong down the road. Is there a tutorial mega-boutique like that online?

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• If you favor "T *var", do you ever write "T*"?

  - by Roger Pate

  Thinking about where we place our asterisks; how do those that prefer to keep the "pointerness" away from the type and with the identifier (int *i) write code when the identifier is missing? void f(int*); // 1 void f(int *); // 2 The former seems much more common, no matter what your preference when with the identifier. Is this a special case? What makes it an exception? However, the first still isn't universal, because I have seen the latter style. Besides consistency along the lines of "there's always a space with the identifier, so we have one without", are there any other reasons to prefer it? What about casts or array and function types? How would you re-write these: (void*)var /*or*/ (void *)var int[3] /*or*/ int [3] // more relevant in C++ than C: Example<int[3]> void(int) /*or*/ void (int) // more relevant in C++ than C: std::function<void(int)> The latter two would rarely, if ever, be used in C, but are seen with C++ templates.

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• Optimising news fetching

  - by aceBox

  I have a web scraper for scraping news from different sources in wp7. My current appraoch for doing this is: load newspapers information from xml file. go to the specified sections and fetch the urls of the news items. go to each url and fetch headline, image, publisher. display using a MVVM architecture of windows phone. The whole thing takes place asynchronously...meaning as soon as url from a section of a newspaper is fetched it is added to the queue, and the second stage consisting of fetching headline, image etc starts... and as soon this is fetched even for one article, it is displayed. Later on as more articles are fetched, they are added on to the list. For the fetching purpose I am using a SmartThreadPool(http://www.codeproject.com/Articles/7933/Smart-Thread-Pool) for windows phone. My problem is that...even for fetching around 80 items (in total) from 9 publications, it is taking more than a minute. How can i speed up the procedure? Note: I have a two stage approach because many times the images are not available with headlines, and are only found in the article.

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• What to do if you find a vulnerability in a competitor's site?

  - by user17610

  While working on a project for my company, I needed to build functionality that allows users to import/export data to/from our competitor's site. While doing this, I discovered a very serious security exploit that could, in short, perform any script on the competitor's website. My natural feeling is to report the issue to them in the spirit of good-will. Exploiting the issue to gain advantage crossed my mind, but I don't want to go down that path. So my question is, would you report a serious vulnerability to your direct competition, in order to help them? Or would you keep your mouth shut? Is there a better way of going about this, perhaps to gain at least some advantage from the fact that I'm helping them by reporting the issue? Update (Clarification): Thanks for all your feedback so far, I appreciate it. Would your answers change if I were to add that the competition in question is a behemoth in the market (hundreds of employees in several continents), and my company only started a few weeks ago (three employees)? It goes without saying, they most definitely will not remember us, and if anything, only realize that their site needs work (which is why we entered this market in the first place). I confess this is one of those moral vs. business toss-ups, but I appreciate all the advice.

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• Software architecture map to aid cross team communication?

  - by locster

  I work in a company where multiple teams each work on different parts of a software product in a vaguely agile/scrum manner. Mostly the organisation works well but there have been instances where a team may make a change without realising its impact on other teams. Where dependence is known communication has been good, and where dependence is suspected then 'broadcast' emails and informal conversations have also worked well. But there exists a sub-set of tasks that fall between the cracks. Broadcast emails are likely not the solution as they would become too numerous such that the email signal/noise ratio would fall. I'm contemplating a solution that involves a sort of map of the software, which details all of the various parts of the system and loosely tries to place interacting and dependent parts near to each other. Each developer then updates their position on the map (today I'm working on X and Y), and therefore if two or more developers happen to be co-located (or proximate) on the map then we can see this each day and this could form the trigger for further discussion on possible overlap and conflict. Is such a method out there and in use? If so what is it and does it work? Otherwise, do you think such a scheme has merit?

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• Advice and resources on collaborative environments

  - by Tjaart

  I need some advice on collaborative software environments. More specifically, I am looking for books and reference materials that can aid me in understanding team and code structures and the interactions thereof. In other words books, blogs or white papers explaining: Different strategies for structuring teams that share common code between each other but have distinct individual functions? To summarise my question I would like to know what would be a good source of knowledge if I were to set up teams in an organisation that shared code but each unit still remained autonomous. I have done some research on this subject and explored: code review tools, distributed VCS, continuous integration tools, Unit testing automation. The tough part about implementing these tools are to determine where a good place would be to start, which tools are low hanging fruit, which tools or methods provide higher success rates. If someone asks me about code quality reference I point them to Code Complete. I am looking for an equivalent guide on software team structures and tools to make this equation work better. I realise that this question is quite vague but it arose as "we need to share code between teams without breaking each others stuff and causing management headaches and reams of red tape" The answer is definitely not simple and requires changes on many levels, hence the question. If the question is too vague please vote to close or delete. I would accept any good starting point as an answer.

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• Cannot create a neutral unit with a trigger

  - by Xitcod13

  I've been playing around with the starcraft UMS (Use map settings) for a while and usually i figure things out pretty quickly when im stuck. Alas not this time. I'm trying to place a neutral unit (player 12) using a trigger. It refuses to work. I'm using Scmdraft 2.0 as my editor (but i cant get it to work in other editors either) (all neutral units placed before the game starts are visible and all other triggers work fine. Also i created a text msg and it does displays it in-game so the trigger triggers ) For testing I created a trigger that looks like this: Player: neutral (i tried neutral players player 1 and all players as well) Condition: -always Action: -Create *1 Terran Medic* at '*location 022*' for *Neutral* (also tried neutral players) When I start the game nothing happens. Here is what I tried: I tried placing a start location for neutral player (player 12) I tried changing the owner under map properties of player 12 to neutral and computer from unused which was the default. Although it seems like it should be a common enough problem, I don't see it in any FAQ and I cant find anything about it when I Google it. Thanks in advance.

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• What are some best practices for minimizing code?

  - by CrystalBlue

  While maintaining the sites our development team has created, we have come across include files and plugins that have proven to be very useful to more then one part of our applications. Most of these modules have come with two different files, a normal source file and a min file. Seeing that the performance and speed of a page can be increased by minimizing the size of the file, we're looking into doing that to our pages as well. The problem that we run into is a lot of our normal pages (written in ASP classic) is a mix of HTML, ASP, Javascript, CSS, and include files. We have some pages that have their JS both in include files and in the page, depending on if the function is only really used in that page or if it's used in many other pages. For example, we have a common.js and an ajax.js file, both are used in a lot of pages, but not all of them. As well as having some functions in a page that doesn't really make sense to put into one master page. What I have seen a few other people do online is use one master JS file and place all of their javascript into that, minify it, gzip it, and only use that on their production server. Again, this would be great, but I don't know if that fully works for our purposes. What I'm looking for is some direction to go with on this. I'm in favor of taking all of our JS and putting it in one include file, and just having it included in every page that is hit. However, not every page we have needs every bit of JS. So would it be worth the compilation and minifying of the files into one master file and include it everywhere, or would it be better to minify all other files and still include them on a need-to-use basis?

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• Speaking at Sinergija12

  - by DigiMortal

  Next week I will be speaker at Sinergija12, the biggest Microsoft conference held in Serbia. The first time I visited Sinergija it was clear to me that this is the event where I should go back. Why? Because technical level of sessions was very well in place and actually sessions I visited were pretty hardcore. Now, two years later, I will be back there but this time I’m there as speaker. My session at Sinergija12 Here are my three almost finished sessions for Sinergija12. ASP.NET MVC 4 Overview Session focuses on new features of ASP.NET MVC 4 and gives the audience good overview about what is coming. Demos cover all important new features - agent based output, new application templates, Web API and Single Page Applications. This session is for everybody who plans to move to ASP.NET MVC 4 or who plans to start building modern web sites.   Building SharePoint Online applications using Napa Office 365 Next version of Office365 allows you to build SharePoint applications using browser based IDE hosted in cloud. This session introduces new tools and shows through practical examples how to build online applications for SharePoint 2013.   Cloud-enabling ASP.NET MVC applications Cloud era is here and over next years more and more web applications will be hosted on cloud environments. Also some of our current web applications will be moved to cloud. This session shows to audience how to change the architecture of ASP.NET web application so it runs on shared hosting and Windows Azure with same code base. Also the audience will see how to debug and deploy web applications to Windows Azure. All developers who are coming to Sinergija12 are welcome to my sessions. See you there! :)

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• How to run around another football player

  - by Lumis

  I have finished a simple 2D one-on-one indoor football Android game. The thing that it seemed so simple to me, a human being, turned out to be difficult for a computer: how to go around the opponent … At the moment the game logic of the computer player is that if it hits into the human player will step back few points on the pixel greed and then try again to go towards the ball. The problem is if the human player is in-between then the computer player will oscillate in one place, which does not look very nice and the human opponent can use this weakness to control the game. You can see this in the photo – at the moment the computer will go along the red line indefinitely. I tried few ideas but it proved not easy to do it when both the human player and the ball are constantly moving so at each step computer would change directions and “oscillate” again. Once when the computer player reaches the ball it will kick it with certain amount of random strength and direction towards the human’s goal. The question here is how to formulate the logic of going around the ever moving human opponent and how to translate it into the co-ordinate system and frame by frame animation… any suggestions welcome.

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• Interface (contract), Generics (universality), and extension methods (ease of use). Is it a right design?

  - by Saeed Neamati

  I'm trying to design a simple conversion framework based on these requirements: All developers should follow a predefined set of rules to convert from the source entity to the target entity Some overall policies should be able to be applied in a central place, without interference with developers' code Both the creation of converters and usage of converter classes should be easy To solve these problems in C# language, A thought came to my mind. I'm writing it here, though it doesn't compile at all. But let's assume that C# compiles this code: I'll create a generic interface called IConverter public interface IConverter<TSource, TTarget> where TSource : class, new() where TTarget : class, new() { TTarget Convert(TSource source); List<TTarget> Convert(List<TSource> sourceItems); } Developers would implement this interface to create converters. For example: public class PhoneToCommunicationChannelConverter : IConverter<Phone, CommunicationChannle> { public CommunicationChannel Convert(Phone phone) { // conversion logic } public List<CommunicationChannel> Convert(List<Phone> phones) { // conversion logic } } And to make the usage of this conversion class easier, imagine that we add static and this keywords to methods to turn them into Extension Methods, and use them this way: List<Phone> phones = GetPhones(); List<CommunicationChannel> channels = phones.Convert(); However, this doesn't even compile. With those requirements, I can think of some other designs, but they each lack an aspect. Either the implementation would become more difficult or chaotic and out of control, or the usage would become truly hard. Is this design right at all? What alternatives I might have to achieve those requirements?

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• How can # of unique visitors be more than # of visits?

  - by Dallas

  I am confused as heck. When looking at a few individual pages, I am seeing weird results I hope someone can help explain. I am doing manual standard reports, and not creating or using a widget. For each of the two tests below, the metrics I am using are visits (not visitors) and unique visitors. I am using Page as my primary dimension and Page Title as secondary. I am filtering to include certain Pages. Example 1 - Looking at a single page... I see 731 unique visitors and 169 visits. How is this possible? Does google just flip them around for some reason? Example 2 - Looking at several pages combined... If you examine the timeline below , you can see that the numbers are all over the place. How is it possible to have more unique visitors than visits? What am I missing? I would suspect that if things were just flipped around, then I should still see one line that is always below the other line. Anyone clue me in to what may be happening here? I also notice that the visits column (just out of view) adds up to the total, but the unique visitors column clearly doesn't.

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• Use a SQL Database for a Desktop Game

  - by sharethis

  Developing a Game Engine I am planning a computer game and its engine. There will be a 3 dimensional world with first person view and it will be single player for now. The programming language is C++ and it uses OpenGL. Data Centered Design Decision My design decision is to use a data centered architecture where there is a global event manager and a global data manager. There are many components like physics, input, sound, renderer, ai, ... Each component can trigger and listen to events. Moreover, each component can read, edit, create and remove data. The question is about the data manager. Whether to Use a Relational Database Should I use a SQL Database, e.g. SQLite or MySQL, to store the game data? This contains virtually all game content like items, characters, inventories, ... Except of meshes and textures which are even more performance related, so I will keep them in memory. Is a SQL database fast enough to use it for realtime reading and writing game informations, like the position of a moving character? I also need to care about cross-platform compatibility. Aside from keeping everything in memory, what alternatives do I have? Advantages Would Be The advantages of using a relational database like MySQL would be the data orientated structure which allows fast computation. I would not need objects for representing entities. I could easily query data of objects near the player needed for rendering. And I don't have to take care about data of objects far away. Moreover there would be no need for savegames since the hole game state is saved in the database. Last but not least, expanding the game to an online game would be relative easy because there already is a place where the hole game state is stored.

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• QR Codes and Short Links - Please Take A Look [closed]

  - by Joe Turner

  I'm looking for a way to create a QR Code and a shortened link when a form is submitted. I have the QR Code bit, but the link is too long for me and the QR Code looks scary and complicated. The way it works is; the user types in (in this instance) a contract number. Then, a folder is created on the server of that contract number. (www.mysite.com/QR/$contractnumber). Then, using PHP again, I create a QR Code through Google because I know that every QR code will be linking to the same place, just a different ending of the link. The only bit that changes is the $POST... I was wondering if there was a way to shorten the link before it goes to Google? It would have to be through php. The user enters the contact number in the form, then that number(usually around 5/6 digits) will be entered into a already existing command? I'm not an expert in anything, I just know some really random snippets of code... And HTML and CSS, of course. Any help would be appreciated and judging by the few days I have been searching this, I think it might help a few people in the future. I would also like to confirm that the solution can't be one of this visual URLShorteners. If it is, it just needs to be the back-end of it, built into a existing form and QR Generator. Simple?

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• JavaOne 2012 in Review

  - by Janice J. Heiss

  Noted freelance writer Steve Meloan has a new article up on otn/java, titled, “JavaOne 2012 Review: Make the Future Java” in which he summarizes the happenings at JavaOne 2012. Along the way, he reminds us that if the future turns out to be anything like the past, Java will do fine: The repeated theme for this year's conference was ‘Make the Future Java,’ and according to recent stats, the groundwork is already firmly in place:    There are 9 million Java developers worldwide.    Three billion devices run Java.    Five billion Java Cards are in use.    One hundred percent of Blu-ray Disc players ship with Java.    Ninety-seven percent of enterprise desktops run Java.    Eighty-nine percent of PC desktops run Java.This year's content curriculum program was organized under seven technical tracks:    Core Java Platform    Development Tools and Techniques    Emerging Languages on the JVM    Enterprise Service Architectures and the Cloud    Java EE Web Profile and Platform Technologies    Java ME, Java Card, Embedded, and Devices    JavaFX and Rich User Experiences”Meloan artfully reminds us of how JavaOne makes learning fun. Have a look at the article here.

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• What's wrong with this OpenGL model picking code?

  - by openglNewbie

  I am making simple model viewer using OpenGL. When I want to pick an object OpenGL returns nothing or an object that is in another place. This is my code: GLuint buff[1024] = {0}; GLint hits,view[4]; glSelectBuffer(1024,buff); glGetIntegerv(GL_VIEWPORT, view); glMatrixMode(GL_PROJECTION); glPushMatrix(); glLoadIdentity(); gluPickMatrix(x,y,1.0,1.0,view); gluPerspective(45,(float)view[2]/(float)view[4],1.0,1500.0); glMatrixMode(GL_MODELVIEW); glRenderMode(GL_SELECT); glLoadIdentity(); //I make the same transformations for normal render glTranslatef(0, 0, -zoom); glMultMatrixf(transform.M); glInitNames(); glPushName(-1); for(int j=0;j<allNodes.size();j++) { glLoadName(allNodes.at(j)->id); allNodes.at(j)->Draw(textures); } glPopName(); glMatrixMode(GL_PROJECTION); glPopMatrix(); hits = glRenderMode(GL_RENDER);

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• When decomposing a large function, how can I avoid the complexity from the extra subfunctions?

  - by missingno

  Say I have a large function like the following: function do_lots_of_stuff(){ { //subpart 1 ... } ... { //subpart N ... } } a common pattern is to decompose it into subfunctions function do_lots_of_stuff(){ subpart_1(...) subpart_2(...) ... subpart_N(...) } I usually find that decomposition has two main advantages: The decomposed function becomes much smaller. This can help people read it without getting lost in the details. Parameters have to be explicitly passed to the underlying subfunctions, instead of being implicitly available by just being in scope. This can help readability and modularity in some situations. However, I also find that decomposition has some disadvantages: There are no guarantees that the subfunctions "belong" to do_lots_of_stuff so there is nothing stopping someone from accidentally calling them from a wrong place. A module's complexity grows quadratically with the number of functions we add to it. (There are more possible ways for things to call each other) Therefore: Are there useful convention or coding styles that help me balance the pros and cons of function decomposition or should I just use an editor with code folding and call it a day? EDIT: This problem also applies to functional code (although in a less pressing manner). For example, in a functional setting we would have the subparts be returning values that are combined in the end and the decomposition problem of having lots of subfunctions being able to use each other is still present. We can't always assume that the problem domain will be able to be modeled on just some small simple types with just a few highly orthogonal functions. There will always be complicated algorithms or long lists of business rules that we still want to correctly be able to deal with. function do_lots_of_stuff(){ p1 = subpart_1() p2 = subpart_2() pN = subpart_N() return assembleStuff(p1, p2, ..., pN) }

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• How are certain analytics metrics (time on site, etc.) usually distributed?

  - by a barking spider

  I'm not sure if I've come to the right place to ask this question, but I'm gathering some information for a research project. We're trying to design an experiment that'll heavily involve web analytics, and I'm trying to figure out some sensible values of mean +/- standard deviation for the following visitor-level (i.e., visitor 1 spends 2 minutes on site, visitor 2 spends 1 minute -- mean 1.5 +/- 0.71...) metrics: time spent on site page views If time allowed, we would put up the sites and gather the information ourselves, but we have a grant deadline coming up. I realize that even though these the distributions of these quantities are probably going to be heavily skewed towards zero, we'll need some reasonable figures or estimates of these figures in order to do sample size calculations, etc. Anyway, I'm not sure where else I'd turn, and I certainly have had a difficult time finding these values in the prior literature. If someone could direct me to a paper with the right information, or if you have these figures on hand (perhaps taken directly from your logs!) -- that would be amazing, and I'd love to hear from you. Thanks in advance, and even though I'm not allowed to reveal too much, rest assured that this info'll be applied towards a good cause :)

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• Choosing the Database Solution for Large Data Application

  - by GµårÐïåñ

  I have been tasked to write an application that will be a combination of document and inventory management in VB.net which will be used to store document images in TIFF, PDF, XPS, TXT, DOC, PPT and so on as binary data that can be retrieved for viewing, printing, and possible OCR to be searchable as well along with meta data such as sender, recipient, type of document, date, source, etc. So the table would probably be something like: DOC_NAME, DOC_DATE, NOTES, ... DOC_BINARY (where the actual document will be put inside) What my concern is finding a database solution that will not become unstable due to size restrictions, records limitations and performance. Some of the options are MS_SQL, SQL Express, SQLite, mySQL, and Access. Now I can pretty much eliminate Access right off the bat as it is just too limiting and not scalable. I can further eliminate SQL Express because of the 2 GB limit and again scalability. So that leaves me with MS_SQL, SQLite and mySQL (although if anyone has other options they think would be good as well, please feel free to share them, by no means am I set on these only). So this brings me to what you guys think is the best option for what I have described. The goal is that the data is all in one place (a single file) that will make backup and portability easier. For small volume usage, pretty much any solution will hold for a while, but my goal is to think ahead and make sure its able to withstand heavy large volume usage as well. Another consideration is also the interoperability with .NET and stability of such code to avoid errors and memory leaks. Your feedback would be greatly appreciated.

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• Windows Recovery from Grub messed up my computer?

  - by Hudson Worden

  Ok so I'm a noob when it comes to Operating Systems and I think I really messed up this time. So I have a laptop that dual boots Windows 7 and Linux Mint 11. I was trying to boot into Windows 7 but it would just have a black screen with a blinking cursor. So I turned off my computer and tried again. Still a black screen with a cursor. So I thought "well it must be broken somehow and I remembered seeing something like 'Windows Recovery' from the boot menu so I should try it." So when I turned on my computer a third time I selected 'Windows Recovery' (Something like that I can't remember exactly what it was called). After I had selected that I got a white Windows window that said in big red letters "ERROR". I turned off my computer again a turned it back on expecting the Grub menu to reappear. I was wrong. Instead I am greeted with error: no such partition grub rescue. Then I put in a live CD for ubuntu 11.04 and tried looking at my partitions using the disk manager. Looking at my partitions I notice that there isn't a Linux partition anymore and in its place is a unallocated space partition yet the Linux Swap partition is still there. My windows partition is still fine and I can access the files in it. If you understand what has happened, is there anyway I can get my files back? I don't care about reinstalling the OS again. I just want those files that are in the Linux Mint partition.

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• maxItemsInObjectGraph limit required to be changed for server and client

  - by Michael Freidgeim

  We have a wcf service, that expects to return a huge XML data. It worked ok in testing, but in production it failed with error  "Maximum number of items that can be serialized or deserialized in an object graph is '65536'. Change the object graph or increase the MaxItemsInObjectGraph quota."The MSDN article about   dataContractSerializer xml configuration  element  correctly  describes maxItemsInObjectGraph attribute default as 65536, but documentation for of the DataContractSerializer.MaxItemsInObjectGraph property and DataContractJsonSerializer.MaxItemsInObjectGraph Property are talking about Int32.MaxValue, which causes confusion, in particular because Google shows properties articles before configuration articles.When we changed the value in WCF service configuration, it didn't help, because the similar change must be ALSO done on client.There are similar posts:http://stackoverflow.com/questions/6298209/how-to-fix-maxitemsinobjectgraph-error/6298356#6298356You need to set the MaxItemsInObjectGraph on the dataContractSerializer using a behavior on both the client and service. See  for an example.http://devlicio.us/blogs/derik_whittaker/archive/2010/05/04/setting-maxitemsinobjectgraph-for-wcf-there-has-to-be-a-better-way.aspxhttp://stackoverflow.com/questions/2325321/maxitemsinobjectgraph-ignored/4455209#4455209 I had forgot to place this setting in my client app.config file.http://stackoverflow.com/questions/9191167/maximum-number-of-items-that-can-be-serialized-or-deserialized-in-an-object-graphttp://stackoverflow.com/questions/5867304/datacontractjsonserializer-and-maxitemsinobjectgraph?rq=1 -It seems that DataContractJsonSerializer.MaxItemsInObjectGraph has actual default 65536, because there is no configuration for JSON serializer, but  it complains about the limit.I believe that MS should clarify the properties documentation re default limit and make more specific error messages to distinguish server side and client side errors.Note, that as a workaround it's possible to use commonBehaviors section which can be defined only in machine.config:<commonBehaviors> <behaviors> <endpointBehaviors> <dataContractSerializer maxItemsInObjectGraph="..." /> </endpointBehaviors> </behaviors></commonBehaviors>v

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• Connecting two monitors at the corners

  - by fastmultiplication

  I am using two separate X screens on two monitors and I would like them to be connected at the lower right corner. That is, if you move to the lower right corner of screen0 the mouse should appear at the upper left of screen1. I do not want an entire edge of each monitor to be permeable to the mouse. I modified the xorg.conf file like so: Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" 0 0 Screen 1 "Screen1" Relative "Screen0" 1200 1000 InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" EndSection (screen 0's resolution is 1280x1024) so there is a bit of overlap. However whenever I move the mouse to the bottom of screen0, the pointer appears at the upper left of screen1. And, the entire top of screen1 is permeable to the mouse and brings it to the lower left corner of screen0. I have tried various numbers in following the "relative" statement - if I put 1280 1024 the mouse does not cross over at all. If I use 1280 1023 the entire right side of screen0 is permeable. I haven't been able to find any documentation about how to explicitly tell the mouse where to crossover - is there some? It seems that xorg is being really aggressive in guessing where the mouse crossover should take place. Does anyone know how to do this? Thanks!

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• Why does there seem to be a lot of fear in choosing the "wrong" language to learn?

  - by Shewbox

  Perhaps its just me, but as a current CS student I have already come across many questions on this site and elsewhere about not just "Which language should I use for x?" but also "Does anyone still use language Y?" My first CS class was taught in Scheme, which, if I'm not mistaken, isn't used widely (at least in comparison to languages like Java, PHP, Python, etc). Many of my classmates balked at the idea of having to learn a language they would never have to use again, but I don't quite understand where so much of this fear of learning less popular languages comes from. No, I may not use Scheme in any job I get, but I certainly don't regret having learned to use it (albeit in a very beginner, not very in-depth manner in that one semester). I am taking a search engines class this semester, which is done in Perl and again I am seeing classmates complaining about the language choice. I can understand having a favorite language and disliking others but why do some get worked up over learning it in the first place? Can you really learn the "wrong" language? Isn't learning something like Scheme or Haskell good mental exercise if nothing else, and useful at least to exposure to different ways of solving problems?

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• Guidelines for creating referentially transparent callables

  - by max

  In some cases, I want to use referentially transparent callables while coding in Python. My goals are to help with handling concurrency, memoization, unit testing, and verification of code correctness. I want to write down clear rules for myself and other developers to follow that would ensure referential transparency. I don't mind that Python won't enforce any rules - we trust ourselves to follow them. Note that we never modify functions or methods in place (i.e., by hacking into the bytecode). Would the following make sense? A callable object c of class C will be referentially transparent if: Whenever the returned value of c(...) depends on any instance attributes, global variables, or disk files, such attributes, variables, and files must not change for the duration of the program execution; the only exception is that instance attributes may be changed during instance initialization. When c(...) is executed, no modifications to the program state occur that may affect the behavior of any object accessed through its "public interface" (as defined by us). If we don't put any restrictions on what "public interface" includes, then rule #2 becomes: When c(...) is executed, no objects are modified that are visible outside the scope of c.__call__. Note: I unsuccessfully tried to ask this question on SO, but I'm hoping it's more appropriate to this site.

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• Why OpenDialog.py don't work on Jotty application

  - by venerable13

  I'm a Python beginner, I installed quickly, I wrote a "quickly tutorial" in terminal and I did all the steps before at: "However, the application is not complete. There are a few things left for you to do:" All the next steps aren't finished yet because when I use open dialog and select one of the files saved, the content of the file isn't showed on "textview1", Why? Only is deleted the content written. Before if was used without dialog works great. SaveDialog.py work great. -def on_mnu_new_activate(self, widget, data=None) don't work neither. -If I use the bold lines by the others don't work. ###def open_file(self, widget, data=None): def on_mnu_open_activate(self, widget, data=None): ###def save_file(self, widget, data=None): def on_mnu_save_activate(self, widget, data=None): To view the code, go to the link above, unrar the archive, install "quickly" if you don't have it yet, place inside on jotty directory, then put "quickly run", "quickly edit", "quickly design", depending what do you want to do. Code - problematic code with OpenDialog implemented. Code-part1 - works OK, but without OpenDialog. I need principally that OpenDialog function work great.

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