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• Can Python's set absesnce of ordering be considered random order?

  - by Chuim

  Hello people. I'd like to know if the absence of element ordering of the Python's built-in set structure is "random enough". For instance, taking the iterator of a set, can it be considered a shuffled view of its elements? (If it matters, I'm running Python 2.6.5 on a Windows host.)

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• What is the most efficient way to populate class attributes with a row from a database query?

  - by ensnare

  Looking to have a database query set all the instance variables in a class: Example: def populate(self, if): #Perform mysql query self._name = row['name'] self._email = row['email'] ... What's the fastest way to do this? Or is this not recommended (with a better approach)? Thanks.

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• How can the AssemblyName class be used for existing Assemblies?

  - by IbrarMumtaz

  This is another exam related question. I want to know how can I use the AssemblyName class to represent an existing assembly that already exists on disk??? I am talking about from the perspective of using the AppDomain's instance method .Load(), that takes an AssemblyName object as a parameter. I know what MSDN has to say about what the .Load() method was designed for but that aside, I still want to know how to use it !!!

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• How can I delete duplicated users in django?

  - by Catalina

  Hi guys, I need to delete duplicate users in django (by duplicate I mean two or more users with the same email). If your instance there are three records like this: id email 3 [email protected] 56 [email protected] 90 [email protected] I need to delete records 56 and 90 and leave the oldest record id - 3 Is there a way to quickly do this. Thanks :)

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• What happens when I instantiate class in Python?

  - by Konstantin

  Could you clarify some ideas behind Python classes and class instances? Consider this: class A(): name = 'A' a = A() a.name = 'B' # point 1 (instance of class A is used here) print a.name print A.name prints: B A if instead in point 1 I use class name, output is different: A.name = 'B' # point 1 (updated, class A itself is used here) prints: B B Even if classes in Python were some kind of prototype for class instances, I'd expect already created instances to remain intact, i.e. output like this: A B Can you explain what is actually going on?

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• How to create a subject helper method in Rspec2

  - by Hedgehog

  In rpsec 2.12 I expected this helper method definition to work: module X private def build_them(type) puts 'Catching the star' end end context 'public/private instance methods' do subject{ Class.new { extend(::X) } } def subject.build(type) puts "Throwing a star" build_them(type) end it{ should respond_to :build} end The actual result is a failed spec: expected #<Class:0x00000002ea5f90> to respond to :build I expected the example to pass Any suggestions on how to do this correctly?

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• How to use Rails2 when Rails3 is installed

  - by Earlz

  Hello I have both Rails2 and Rails3(beta 3) installed by Ruby Gems. Everything right now defaults to using Rails3. For instance rails myproject will create a new Rails3 template. How do I override this so everything goes to Rails2?

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• Python what's the data structure for triple data

  - by Paul

  I've got a set of data that has three attributes, say A, B, and C, where A is kind of the index (i.e., A is used to look up the other two attributes.) What would be the best data structure for such data? I used two dictionaries, with A as the index of each. However, there's key errors when the query to the data doesn't match any instance of A.

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• KeyNotFound Exception in CSsharp

  - by C Patton

  I'm about ready to bang my head against the wall I have a class called Map which has a dictionary called tiles. class Map { public Dictionary<Location, Tile> tiles = new Dictionary<Location, Tile>(); public Size mapSize; public Map(Size size) { this.mapSize = size; } //etc... I fill this dictionary temporarily to test some things.. public void FillTemp(Dictionary<int, Item> itemInfo) { Random r = new Random(); for(int i =0; i < mapSize.Width; i++) { for(int j=0; j<mapSize.Height; j++) { Location temp = new Location(i, j, 0); int rint = r.Next(0, (itemInfo.Count - 1)); Tile t = new Tile(new Item(rint, rint)); tiles[temp] = t; } } } and in my main program code Map m = new Map(10, 10); m.FillTemp(iInfo); Tile t = m.GetTile(new Location(2, 2, 0)); //The problem line now, if I add a breakpoint in my code, I can clearly see that my instance (m) of the map class is filled with pairs via the function above, but when I try to access a value with the GetTile function: public Tile GetTile(Location location) { if(this.tiles.ContainsKey(location)) { return this.tiles[location]; } else { return null; } } it ALWAYS returns null. Again, if I view inside the Map object and find the Location key where x=2,y=2,z=0 , I clearly see the value being a Tile that FillTemp generated.. Why is it doing this? I've had no problems with a Dictionary such as this so far. I have no idea why it's returning null. and again, when debugging, I can CLEARLY see that the Map instance contains the Location key it says it does not... very frustrating. Any clues? Need any more info? Help would be greatly appreciated :)

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• Pass parameters to Flash Main (Document) class

  - by loto

  In Flash CSn/AS3 you associate a Main class with a flash file which when loaded in the flash player "automatically creates an instance of the program's main class." I'd like to know how to pass arguments to the main class, since you don't write it yourself (you put its name in the Document textfield in the IDE).

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• Binding the IsSelected property of ListBoxItem to a property on the object from it's source.

  - by BrandonS

  I have a WPF ListBox control and I'm setting it's "ItemsSource" to a collection of item objects. How can I bind the "IsSelected" property of the ListBoxItem to a "Selected" property of a corresponding item object without having an instance of the object to set as a binding.Source?

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• Overriding jQuery plugin methods, as default and for single instances

  - by Kilgore2k

  Hi, The basic question is: How do I perform a basic override of a plugin method without editing the original plugin file? Is it possible to create an override for a specific instance: Example: An rtf plugin uses: $('selector').wysiwyg('setContent',newContent); In order to display the rtf text as readonly I would like for the same method to be applied to a div instead of the body of the IFRAME I would like to overwrite the original 'setContent' with my own code, just for this one element. Thanks

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• Linq DBML multiple sql servers

  - by Hurricanepkt

  I have an archive system that had to be on two sql databases for simplicity one is Archive2009 and the other Archive2010 they are both on the same sql server and instance and have identical structures however I have a page that needs to view the old one and the new one (I can make two seperate pages) How best would I go about doing this? Dynamically changing the connection string etc?

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• Properties of mbox message in mbox module in Python

  - by Rajasankar

  I trying my luck to manage my mailbox with python. My example code is for eachmail in mailbox.mbox(mboxfile): print eachmail['From'] I got following by printing entire content. Delivered-To Subject To Content-Type MIME-Version Message-Id Is there any full document showing what are all the properties I can get from the mbox message instance? Python docs doesn't specify any of these http://docs.python.org/library/mailbox.html#mailbox.mbox

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• Javascript: Static member variable containing object instances

  - by tom

  I have the following: function Preferences() { } Preferences.players = { 'player1': new Player() } players is a static member variable of Preferences and I'm trying to make it an object containing an instance of a Player. However, it doesn't appear to let me do this. It seems like it will allow me to define players if I make it a non-static member variable however. Like so: function Preferences() { var players = { 'player1' : new Player() } } Is it possible to create a static member variable containing instances of an object in JS?

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• How can I assure a class to have a static property by using interface or abstract?

  - by burak ozdogan

  Hi, I have one abstract class -let's say myBase. And I want all the classes derived from myBase to have one static field called public static List<string> MyPArameterNames { get {return _myParameterNames;} } So, every child class can tell what parameter names it uses; I want static because I do not want to create an instance just for this. How can I achieve this?

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• How could I generate instances of an object randomly at the top of the screen and make them "fall"?

  - by Custard

  I am making a game in Flash CS4 (actionscript 3) and I would like to be able to make "copies" of an instance that would randomly appear at the top of the screen and fall. For example, multiple objects(that are the same one) are falling from the top of the screen continuously, starting at random X positions. (i think this would be considered Real-Time effect). P.S., please tell me if the information is insufficient for an answer, I couldn't think of much more to add to it. Thanks for your time and answers, -Custard

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• How to play music on site preventing easy direct file download

  - by Hugo Palma

  I'm starting a blog with a hosted wordpress instance and i would like to be able to stream music using a flash player on some posts. The problem is that every player i find uses a simple param to get the file url which makes it very easy for someone to find that url and just download the file. I know that it's probably impossible to prevent this all together, but i at least don't want it to be obvious. A server side solution can be implemented as i have full access to the server.

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• Accessing Values of a ForeignKey or OneToOne object in ModelForm

  - by theactiveactor

  I have a ModelFormA for ModelA, which has a one-one relationship with ModelB and foreign-key relationship with ModelC. Inside ModelFormA, I can access attributes of the current ModelA instance via self.cleaned_data["colA-1"]. How would I access attributes of ModelB or ModelC?

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• How to listen to that property?

  - by mystify

  @constant kAudioSessionProperty_AudioInputAvailable A UInt32 with a value other than zero when audio input is available. Use this property, rather than the device model, to determine if audio input is available. A listener will notify you when audio input becomes available. For instance, when a headset is attached to the second generation iPod Touch, audio input becomes available via the wired microphone. So, if I wanted to get notified about kAudioSessionProperty_AudioInputAvailable, how would I do that?

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• Workflow State not changing in asp.net

  - by shail

  hi i m trying to change the state for workflow from one state to another on button click its working fine with windows but not with web application and its instance id does not persist i have used SqlWorkflowPersistenceService also. what can b the solution for this. thanks

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• Is this a problem typically solved with IOC?

  - by Dirk

  My current application allows users to define custom web forms through a set of admin screens. it's essentially an EAV type application. As such, I can't hard code HTML or ASP.NET markup to render a given page. Instead, the UI requests an instance of a Form object from the service layer, which in turn constructs one using a several RDMBS tables. Form contains the kind of classes you would expect to see in such a context: Form= IEnumerable<FormSections>=IEnumerable<FormFields> Here's what the service layer looks like: public class MyFormService: IFormService{ public Form OpenForm(int formId){ //construct and return a concrete implementation of Form } } Everything works splendidly (for a while). The UI is none the wiser about what sections/fields exist in a given form: It happily renders the Form object it receives into a functional ASP.NET page. A few weeks later, I get a new requirement from the business: When viewing a non-editable (i.e. read-only) versions of a form, certain field values should be merged together and other contrived/calculated fields should are added. No problem I say. Simply amend my service class so that its methods are more explicit: public class MyFormService: IFormService{ public Form OpenFormForEditing(int formId){ //construct and return a concrete implementation of Form } public Form OpenFormForViewing(int formId){ //construct and a concrete implementation of Form //apply additional transformations to the form } } Again everything works great and balance has been restored to the force. The UI continues to be agnostic as to what is in the Form, and our separation of concerns is achieved. Only a few short weeks later, however, the business puts out a new requirement: in certain scenarios, we should apply only some of the form transformations I referenced above. At this point, it feels like the "explicit method" approach has reached a dead end, unless I want to end up with an explosion of methods (OpenFormViewingScenario1, OpenFormViewingScenario2, etc). Instead, I introduce another level of indirection: public interface IFormViewCreator{ void CreateView(Form form); } public class MyFormService: IFormService{ public Form OpenFormForEditing(int formId){ //construct and return a concrete implementation of Form } public Form OpenFormForViewing(int formId, IFormViewCreator formViewCreator){ //construct a concrete implementation of Form //apply transformations to the dynamic field list return formViewCreator.CreateView(form); } } On the surface, this seems like acceptable approach and yet there is a certain smell. Namely, the UI, which had been living in ignorant bliss about the implementation details of OpenFormForViewing, must possess knowledge of and create an instance of IFormViewCreator. My questions are twofold: Is there a better way to achieve the composability I'm after? (perhaps by using an IoC container or a home rolled factory to create the concrete IFormViewCreator)? Did I fundamentally screw up the abstraction here?

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• What is the meaning of this C++ Error std::length_error

  - by Janusz

  While running my program I get this Error: terminate called after throwing an instance of 'std::length_error' what(): basic_string::_S_create Abort trap I know that you can't do much without the code but I think that error is to deep in the code to copy all of it. Maybe I can figure it out if I understand what this error means. Is this a sign for an issue with reading or writing at the wrong memory address? Is there something I can do to get more information about the problem from my program?

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• drupal taxonomy

  - by slimcady

  I have several different content type nodes (videos, image galleries, stories...) that I would like to categorize and create a top-level page that aggregates these nodes. So for example, the top-level page would have teaser thumbnails very similar to the front page view but of course filtered for that topic (like for instance automobiles, and motorcycles would have its own page, etc...). What is the best way to accomplish this? Taxonomy? Views?

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• Switching from PHP to Ruby - is it the answer to performance?

  - by Industrial

  Hi everyone, I get more often the answer, when asking performance related stuff regarding PHP applications, that PHP really isn't the language for high-performance applications, and that a compiled language really is the way to go. The only thing holding me back to PHP is that it's what I have learned to work with for some while now and the development is quite rapid. So, is PHP a thing of the past and should be put aside in web applications in favour of Ruby, for instance? Thanks

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