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  • What defines "pythonian" or "pythonic"?

    - by Thomas Owens
    I want to begin to learn Python, and I've seen that phrase come up here before, but I don't know exactly what it means. I've read some websites on Python scripting, but I don't recall ever seeing that (but I could have just glanced over it). What exactly makes something "pythonian" or "pythonic"?

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  • What way to use the CGContext to draw is suitable?

    - by Tattat
    I know that the CGContext cannot call it to draw directly, and it needs to fill the drawing logic in the drawInContext, and call the CGContext to draw using "setNeedsDisplay", so, I designed a cmd to execute, but it cause some problems... like this : http://stackoverflow.com/questions/2617827/why-i-cant-draw-in-a-loop-using-uiview-in-iphone I think the CGContext is very different from my previous programming experience....(I used HTML5 canvas, that allow me add more details, after I draw, so do the Java Swing) Actually, I want to know what is the suitable to implement these kind of thing in Apples' programmer mind. Thz.

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  • Default template arguments for function templates

    - by Arman
    Why are default template arguments only allowed on class templates? Why can't we define a default type in a member function template? For example: struct mycclass { template<class T=int> void mymember(T* vec) { // ... } }; Instead, C++ forces that default template arguments are only allowed on a class template.

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  • Where can I find clear examples of MVC?

    - by Tom
    I've read a couple of things about MVCs but I still don't understand when they should be used and when they shouldn't be used. I am looking for clear examples that say things like "if you're developing this then you should use MVC, like this" and "if you're developing this, you shouldn't use MVC." Most of the examples I've seen rely on complex frameworks which have already implemented everything and you have to learn the framework and use it a lot to understand what's really happening. To many programmers, phrasings such as "UI business logic" sound like marketing terms — for example, the words "Instead the View binds directly to a Presentation Model" are used in this post. I am aware of the dangers that may lurk in the shadows as MVC is a concept and everyone feels like they know it best, yet nobody really knows exactly how to use it because there may be a lot of variables involved and everyone is allowed to have a different perspective on how to dissect a project into the Model, the View and the Controller. There is a lot of theory out there but very few clear examples. What I'm looking for are not "the best" ways of doing it so this should not be considered as subjective; I'm looking for different simple implementations that would allow me to decide on my own which are the best approaches. Succinctly: What are good on-line resources that present pro and con arguments to using MVC in various situations and provide clear examples to help the reader understand the concept?

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  • Does python have one way of doing things?

    - by gath
    I have always seen in python articles/books that python is simple and it has only one way of doing things. I would like someone to explain to me this concept keeping in mind the example below, if i wanted to get the min and max values of sequence i would do the following; seq=[1,2,3,4,5,6] min(seq) #1 max(seq) #6 but i can also do this; seq[:1] #1 seq[-1] #6 surely this are two ways of doing one simple thing. This confuses me a bit. Gath

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  • Get to know what HTML-button is clicked with PHP, no Name of value available

    - by koko
    I have a wizard with 4 steps and in one of the steps, you can add items. By default, there are 3 time 5 empty input-fields listed. When you click a button, there have to be added some more. The 3 times 5 fields are added by a loop. How can I determine where I have to add some fields (in the first 5 field of the second or the third). I can't use another name for every button, because sometimes there can be more then 3 groups of 5 fields. In my code (PHP), I use the name of the button to know what happened in the form, so the name can't be different for the button in every group ... Further, the whole step is 1 form, so the post can't go to another script ... The value of the button has to be the same for every group. I've been thinking on possible solutions and these came up: On click a javascript adds a value to the post (in a hidden field?) But is this posted with the form? Could it be possible to get the ID of the clicked button? This might be different :-) I need a refresh after the click, so pure javascript isn't a solution either ... It is a very specific question, but I hope someone can give me some direction. Here is the code I'm talking about: <h3><label class="list_list:table_title">Eten</label></h3> <table id="eten"> <thead> <tr> <th>Naam item</th> <th>Aantal</th> </tr> </thead> <tbody> <tr> <td class="item"><input type="text" name="item_1_1" value="" class="inputText" maxlength="64" size="46" tabindex="11"/></td> <td class="amount"><input type="text" name="amount_1_1" value="" class="inputText" maxlength="64" size="10" tabindex="11"/></td> </tr> <tr> <td class="item"><input type="text" name="item_1_2" value="" class="inputText" maxlength="64" size="46" tabindex="12"/></td> <td class="amount"><input type="text" name="amount_1_2" value="" class="inputText" maxlength="64" size="10" tabindex="12"/></td> </tr> <tr> <td class="item"><input type="text" name="item_1_3" value="" class="inputText" maxlength="64" size="46" tabindex="13"/></td> <td class="amount"><input type="text" name="amount_1_3" value="" class="inputText" maxlength="64" size="10" tabindex="13"/></td> </tr> <tr> <td class="item"><input type="text" name="item_1_4" value="" class="inputText" maxlength="64" size="46" tabindex="14"/></td> <td class="amount"><input type="text" name="amount_1_4" value="" class="inputText" maxlength="64" size="10" tabindex="14"/></td> </tr> <tr> <td class="item"><input type="text" name="item_1_5" value="" class="inputText" maxlength="64" size="46" tabindex="15"/></td> <td class="amount"><input type="text" name="amount_1_5" value="" class="inputText" maxlength="64" size="10" tabindex="15"/></td> </tr> </tbody> </table> <input id="list_list:add" type="submit" name="list_list:add" value="voeg extra items toe" class="add" /> <div class="spacer"></div> <h3><label class="list_list:table_title">Drinken</label></h3> <table id="drinken"> <thead> <tr> <th>Naam item</th> <th>Aantal</th> </tr> </thead> <tbody> <tr> <td class="item"><input type="text" name="item_2_1" value="" class="inputText" maxlength="64" size="46" tabindex="21"/></td> <td class="amount"><input type="text" name="amount_2_1" value="" class="inputText" maxlength="64" size="10" tabindex="21"/></td> </tr> <tr> <td class="item"><input type="text" name="item_2_2" value="" class="inputText" maxlength="64" size="46" tabindex="22"/></td> <td class="amount"><input type="text" name="amount_2_2" value="" class="inputText" maxlength="64" size="10" tabindex="22"/></td> </tr> <tr> <td class="item"><input type="text" name="item_2_3" value="" class="inputText" maxlength="64" size="46" tabindex="23"/></td> <td class="amount"><input type="text" name="amount_2_3" value="" class="inputText" maxlength="64" size="10" tabindex="23"/></td> </tr> <tr> <td class="item"><input type="text" name="item_2_4" value="" class="inputText" maxlength="64" size="46" tabindex="24"/></td> <td class="amount"><input type="text" name="amount_2_4" value="" class="inputText" maxlength="64" size="10" tabindex="24"/></td> </tr> <tr> <td class="item"><input type="text" name="item_2_5" value="" class="inputText" maxlength="64" size="46" tabindex="25"/></td> <td class="amount"><input type="text" name="amount_2_5" value="" class="inputText" maxlength="64" size="10" tabindex="25"/></td> </tr> </tbody> </table> <input id="list_list:add" type="submit" name="list_list:add" value="voeg extra items toe" class="add" /> <div class="spacer"></div> <h3><label class="list_list:table_title">Varia</label></h3> <table id="varia"> <thead> <tr> <th>Naam item</th> <th>Aantal</th> </tr> </thead> <tbody> <tr> <td class="item"><input type="text" name="item_3_1" value="" class="inputText" maxlength="64" size="46" tabindex="31"/></td> <td class="amount"><input type="text" name="amount_3_1" value="" class="inputText" maxlength="64" size="10" tabindex="31"/></td> </tr> <tr> <td class="item"><input type="text" name="item_3_2" value="" class="inputText" maxlength="64" size="46" tabindex="32"/></td> <td class="amount"><input type="text" name="amount_3_2" value="" class="inputText" maxlength="64" size="10" tabindex="32"/></td> </tr> <tr> <td class="item"><input type="text" name="item_3_3" value="" class="inputText" maxlength="64" size="46" tabindex="33"/></td> <td class="amount"><input type="text" name="amount_3_3" value="" class="inputText" maxlength="64" size="10" tabindex="33"/></td> </tr> <tr> <td class="item"><input type="text" name="item_3_4" value="" class="inputText" maxlength="64" size="46" tabindex="34"/></td> <td class="amount"><input type="text" name="amount_3_4" value="" class="inputText" maxlength="64" size="10" tabindex="34"/></td> </tr> <tr> <td class="item"><input type="text" name="item_3_5" value="" class="inputText" maxlength="64" size="46" tabindex="35"/></td> <td class="amount"><input type="text" name="amount_3_5" value="" class="inputText" maxlength="64" size="10" tabindex="35"/></td> </tr> </tbody> </table> <input id="list_list:add" type="submit" name="list_list:add" value="voeg extra items toe" class="add" /> <div class="spacer"></div> </div> <div id="formButtons"> <input id="list_info:back" type="submit" name="list_info:back" value="<< Terug" tabindex="11" class="back" /> <input id="list_info:next" type="submit" name="list_info:next" value="Volgende >>" tabindex="12" class="next" /> <input id="list_info:options" type="submit" name="list_info:options" value="Opties" tabindex="13" class="options" /> <input id="list_info:finish" type="submit" name="list_info:finish" value="Voltooien" tabindex="14" disabled="disabled" class="finish" /> </div>

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  • conceptual question : what do performSelectorOnMainThread do?

    - by hib
    Hello all, I just come across this strange situation . I was using the technique of lazy image loading from apple examples . when I was used the class in my application it gave me topic to learn but don't what was actually happening there . So here goes the scenario : I think everybody has seen the apple lazytableimagesloading . I was reloading my table on finishing the parsing of data : - (void)didFinishParsing:(NSMutableArray *)appList { self.upcomingArray = [NSMutableArray arrayWithArray:loadedApps]; // we are finished with the queue and our ParseOperation [self.upcomingTableView reloadData]; self.queue = nil; // we are finished with the queue and our ParseOperation } but as a result the the connection was not starting and images were not loading . when I completely copy the lazyimageloading and I replaced the above code with the following code it works fine - (void)didFinishParsing:(NSMutableArray *)appList { [self performSelectorOnMainThread:@selector(handleLoadedApps:) withObject:appList waitUntilDone:NO]; self.queue = nil; // we are finished with the queue and our ParseOperation } So I want to know what is the concept behind this . Please let me know if you can not understand the question or details are not enough because I desperately want to know why it is like this ?

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  • Need a tool to search large structure text documents for words, phrases and related phrases

    - by pitosalas
    I have to keep up with structured documents containing things such as requests for proposals, government program reports, threat models and all kinds of things like that. They are in techno-legalese as I would call them: highly structured, with section numbering and 3, 4 and 5 levels of nesting. All in English I need a more efficient way to locate those paragraphs of nuggets that matter to me. So what I’d like is kind of a local document index/repository, that would allow me to have some standing queries and easily locate sections in documents that talk about my queries. Here’s an example: I’d like to load in 10 large PDF files, each of say 100 pages. Each PDF contains English text, formatted very nicely into paragraphs and sections. I’d like to specify that I am interested in “blogging platforms”, “weaknesses in Ruby”, “localization and internationalization” Ideally then look at a list that showed the section of text, the name of the document, and other information that seemed to be related to and/or include the words and phrases I specified. I am sure something like this exists. I would call it something like document indexing, document comprehension or structured searching.

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  • why is OOP hard for me?

    - by netrox
    I have trouble writing OOP in PHP... I understand the concept but I never create classes for my projects... mainly because it's often a small project and nothing complex. But when I read OOP, it seems more difficult to code than writing simple procedural statements. It also seems to take a lot of room as well with so many empty abstract classes and that can be easily lost in the land of objects... it's becoming like a junkyard to me. Also, I noticed that virtually all instructions on how to use OOP use "car" or "cat" or "dog" analogies. Hello... we're not dealing with animals or cars... we're dealing with windows or consoles. You can talk about analogies to death and I will never learn. What I want is see a code that's written to show how objects are created - not, "aCow-moo!" For example, I want to see a browser window object displaying say... three inputs. I want to see an "object" created to output a window with three inputs then I want to see how overriding works, like change the window object to display only two inputs instead of three inputs. I think that would make learning more easy, wouldn't it? Any recommended tutorials of that nature instead of quacks, moos, and woofs.

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  • A quick over view of facebook's db?

    - by Matt
    Hey guys I find it hard to believe that Facebook uses simple sql, surely it would use some other method but lets assume for now it does use sql how would the code assimilating the 'wall' work? Lets say that there is three tables (just for the example) Friends: id (entry key) - uid(your id) - fid (your mates' id) Wall:id (entry key) - username - comment - time - commentcount comments: id (entry key) - wid (wall id (original comment)) - reply - time Lets forget about the like part and report etc, as well as mod things (ip, ban etc.) How would this work? Select wall.id, wall.username, wall.comment, wall.time, wall.commentcount, comments.wid, comments.reply, comments.time FROM wall inner join comments ON wall.id=comments.wid ORDER BY wall.time; That's your own wall but how do they get friend's? A heap of unions?

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  • Collision detections and how efficient they are

    - by Shadow
    How exactly do you implement collision detection? What are the costs involved? Do different platforms(c/c++, java, cocoa/iphone, flash, directX) have different optimizations for calculating collisions. And lastly are there libraries available to do this for me, or some that I can just interpret for my platform of choice? As I understand it you would need to loop through the collision map and find the area in question and then compair the input thing(e.g. a sprite) to the type of pixel that is in the questioned area. I understand the very basic idea, but I don't understand the underlying implementation or even a higher level one for that matter. It would seem that this type of detection, or any for that matter, is very costly. Tile map? Bit array? How are these created from an image(I would guess looping and doing stuff)? The reason I ask this question is to get a better understanding of the efficiency behind the scenes and to understand exactly what is going on. Links, references, or examples would be very helpful. I know this question is a bit longwinded so any help or references would be very welcome. Thanks SO!

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  • Methods to Analyze Sell Orders (in a video game)

    - by Travis
    I'm building a market manager for EVE, but this problem should be solvable without any prior knowledge of the game. Basically, sell orders in EVE look like this: All I'm really concerned with is picking a good price. The numbers the program would pick are sent out to our production team so they can buy the items to build things. Just like in a real market, the numbers we send off need to reflect the cheapest price that still offers a good quantity. Also, available quantities change over time, so we can't just pick the lowest listed price. For example, in the screencap above, we would set the sell price between 2,800.00 ISK and 3,000.00 ISK, even if only 500 units were needed. Even though the cheapest order would fit the quantity, it would probably quickly disappear. It would be better to set the price a tad higher so we don't underpay the production people. The Question: It's easy enough to figure prices out just by looking at the data, but I can't figure out how to have a program [java] do it. Different items sell with much less or more quantities (i.e. 3 or 300 or 3000 items) so the program has to be able to modify itself based on the offerings. I don't really want code as much as I do a way to think this through. Thanks in advance.

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  • Concept: Mapping irregular shapes (cartoons, sprites) to triangles in OpenGL ES

    - by Moshe
    I understand how mapping a triangle texture to a triangle works, but how do you map other things? I can't see myself mapping a circle onto a triangle. If it were a quad (square), I could see it happening, but why would a graphic not get warped on a triangle? EDIT: Bonus question: What are some good OpenGL ES tutorials online? Videos and articles count. (I've seen the Stanford University stuff on iTunes U and think it's excellent, but I want more.)

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  • C++ - what does the colon after a constructor mean?

    - by waitinforatrain
    I'd happily Google this but don't know what to call it to Google it. I have a piece of code here: class demo { private: unsigned char len, *dat; public: demo(unsigned char le = 5, unsigned char default) : len(le) { dat = new char[len]; for (int i = 0; i <= le; i++) dat[i] = default; } void ~demo(void) { delete [] *dat; } }; class newdemo : public demo { private: int *dat1; public: newdemo(void) : demo(0, 0) { *dat1 = 0; return 0; } }; (It's from a past exam paper and the question is to correct errors in the code so ignore errors!) My question is, what are the ": len(le) " and " : demo(0, 0)" called? Something to do with inheritance?

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  • Question about Convolutional neural network.

    - by Nhu Phuong
    I readed few book and acticles about Convolutional neural network, it seem I understand the concept but I don't know how to put it up like in image below: from 28x28 normalized pixel INPUT we get 4 feature map 24x24. but how to get them ? size the INPUT image ? or perform image transformation? but what kind of transformation? or cut up the input image to 4 piece 24x24 by 4 corner? I don't understand the process to me it seem they cut up or resize the image to more smaller at each step. please help thanks.

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  • Is www.example.com/post/21/edit a RESTful URI? I think I know the answer, but have another question.

    - by tmadsen
    I'm almost afraid to post this question, there has to be an obvious answer I've overlooked, but here I go: Context: I am creating a blog for educational purposes (want to learn python and web.py). I've decided that my blog have posts, so I've created a Post class. I've also decided that posts can be created, read, updated, or deleted (so CRUD). So in my Post class, I've created methods that respond to POST, GET, PUT, and DELETE HTTP methods). So far so good. The current problem I'm having is a conceptual one, I know that sending a PUT HTTP message (with an edited Post) to, e.g., /post/52 should update post with id 52 with the body contents of the HTTP message. What I do not know is how to conceptually correctly serve the (HTML) edit page. Will doing it like this: /post/52/edit violate the idea of URI, as 'edit' is not a resource, but an action? On the other side though, could it be considered a resource since all that URI will respond to is a GET method, that will only return an HTML page? So my ultimate question is this: How do I serve an HTML page intended for user editing in a RESTful manner?

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  • How Does Differential Execution Work?

    - by Brian
    I've seen a few mentions of this on SO, but staring at Wikipedia and at an MFC dynamic dialog demo did nothing to enlighten me. Can someone please explain this? Learning a fundamentally different concept sounds nice. Edit: I think I'm getting a better feel for it. I guess I just didn't look at the source code carefully enough the first time. I have mixed feelings about DE at this point. On the one hand, it can make certain tasks considerably easier. On the other hand, getting it up and running (i.e. setting it up in your language of choice) is not easy (I'm sure it would be if I understood it better)...though I guess the toolbox for it need only be made once, then expanded as necessary. I think in order to really understand it, I'll probably need to try implimenting it in another language.

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  • What's the word for "Enable/Disable"?

    - by Led
    When I want to comment code about control Enable/Disable and when I want to discuss with people about the control Enable/Disable, I really hope there is actually a word to it instead of typing or saying "Enable/Disable". Currently I use the word EnDisable, what is the real word of it?

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