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• What should be proper location for sqlit3 database file?

  - by Elliot Chen

  Hi, Everyone: I'm using a sqlite3 database to store app's data. Instead of building a database within program, I introduced an existing db file: 'abc.sqlite' into my project and put it under my 'Resources' folder. So, I think this db file should be inside of 'bundle', so at my init function, I used following statement to read it out: NSString *path = [[NSBundle mainBundle] pathForResource:@"abc" ofType:"sqlite"]; if(sqlite3_open([path UTF8String], &database) != SQLITE_OK) ... It's ok that this db can be opened and data can be retrieved from it. BUT, someone told me that it's better to copy this db file into user folder: such as 'Document'. So, my question is: is it ok to use this db from main bundle directly or copy it to user folder then use that copy. Which is better? Thank you very much!

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• Where do I change the height of a navigationBar for an iPhone app?

  - by Tony

  In my applicationDidFinishLaunching I set up a UINavigationController: - (void)applicationDidFinishLaunching:(UIApplication *)application { navController = [[UINavigationController alloc] init]; [[navController navigationBar] setFrame:CGRectMake(0.0,0.0,320.0,20.0)]; ... } As you can see, I am trying to make the navigation controller's height 20px. However, this is not working. I would imagine setFrame must be the correct function but I am not calling it in the right place. I realize that other questions on SO are similar to mine, but I think setting the navigationBar height should be possible if it responds to setFrame...right? Also, anyone know the default height of the navigationBar? Thanks!

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• Adding a decorator that converts strings to lowercase in Python

  - by user2905382

  So I am new to learning decorators and I have gone through countless tutorials and while I understand and can mostly follow all of the examples, I think the best way to learn, would be to implement a decorator myself. So I am going to use this example below. I realize a decorator is not at all necessary to do this, but for the sake of learning, I would like to add a decorator that filters the strings like dog name and breed and turns them into lowercase. Any ideas or pointers in the right direction would be appreciated. class Dogs: totalDogs = 0 dogList=[] def __init__(self, breed, color, age): self.breed=breed self.color=color self.age=age Dogs.dogList.append(self.breed) Dogs.totalDogs += 1 def displayDogs(self): print "breed: ", self.breed print "color: ",self.color print "age: ",self.age print "list of breeds:", Dogs.dogList print "total dogs: ", Dogs.totalDogs def somedecorator(*args): #now what terrier=Dogs("TeRrIer", "white", 5) terrier.displayDogs() retriever=Dogs("goldenRETRIEVER", "brown", 10) retriever.displayDogs()

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• How to initialize an array of structures within a function?

  - by drtwox

  In the make_quad() function below, how do I set the default values for the vertex_color array in the quad_t structure? /* RGBA color */ typedef { uint8_t r,g,b,a; } rgba_t; /* Quad polygon - other members removed */ typedef { rgba_t vertex_color[ 4 ] } quad_t; Elsewhere, a function to make and init a quad: quad_t *make_quad() { quad_t *quad = malloc( sizeof( quad_t ) ); quad->vertex_color = ??? /* What goes here? */ return ( quad ); } Obviously I can do it like this: quad->vertex_color[ 0 ] = { 0xFF, 0xFF, 0xFF, 0xFF }; ... quad->vertex_color[ 3 ] = { 0xFF, 0xFF, 0xFF, 0xFF }; but this: quad->vertex_color = { { 0xFF, 0xFF, 0xFF, 0xFF }, { 0xFF, 0xFF, 0xFF, 0xFF }, { 0xFF, 0xFF, 0xFF, 0xFF }, { 0xFF, 0xFF, 0xFF, 0xFF } }; ...results in "error: expected expression before '{' token".

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• How should I declare default values for instance variables in Python?

  - by int3

  Should I give my class members default values like this: class Foo: num = 1 or like this? class Foo: def __init__(self): self.num = 1 In this question I discovered that in both cases, bar = Foo() bar.num += 1 is a well-defined operation. I understand that the first method will give me a class variable while the second one will not. However, if I do not require a class variable, but only need to set a default value for my instance variables, are both methods equally good? Or one of them more 'pythonic' than the other? One thing I've noticed is that in the Django tutorial, they use the second method to declare Models. Personally I think the second method is more elegant, but I'd like to know what the 'standard' way is.

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• Python preprocessing imports

  - by FiloSottile

  I am managing a quite large python code base (2000 lines) that I want anyway to be available as a single runnable python script. So I am searching for a method or a tool to merge a development folder, made of different python files into a single running script. The thing/method I am searching for should take code split into different files, maybe with a starting __init___.py file that contains the imports and merge it into a single, big script. Much like a preprocessor. Best if a near-native way, better if I can anyway run from the dev folder. I have already checked out pypp and pypreprocessor but they don't seem to take the point. Something like a strange use of __import__() or maybe a bunch of from foo import * replaced by the preprocessor with the code? Obviously I only want to merge my directory and not common libraries.

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• How to manage orientation in iPad app

  - by Annie

  I have added a image on navigationcontroller in appdelagte class. and set yes in - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { loginViewController = [[LoginViewController alloc]initWithNibName:@"LoginViewController" bundle:nil]; [self.window addSubview:_navController.view]; _navController.navigationBarHidden = NO; navimage = [[UIImageView alloc] init]; navimage.frame = CGRectMake(300, 18, 177, 47); navimage.image = [UIImage imageNamed: @"logo.png"]; [_navController.view addSubview:navimage]; [self.window makeKeyAndVisible]; return YES; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{ return YES; } But navigation image position is not changing. The frame remains same in both modes. Please give me idea how it will be solved in the case of navigation controller image.

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• Setting selected item in custom Zend_Form_Element

  - by sanders

  Hello Everyone, I have created my own little form element for inputting time's. Since I need this on a few places in my application, i decided to create a seperate element for it. Here is the code so fa: class EventManager_Form_Element_Time extends Zend_Form_Element { public function init() { parent::init(); $this->addDecorator('ViewScript', array( 'viewScript' => 'time.phtml' )); $this->addValidator(new Zend_Validate_Regex('/^[0-9]+:[0-9]+:[0-9]+$/')); } public function setValue($value) { if(is_array($value)) { @list($hours, $minutes, $seconds) = $value; $value = sprintf('%s:%s:%s', $hours, $minutes, $seconds); } return parent::setValue($value); } } The corresponding view script, which I have created is: <?php @list($hours, $minutes, $seconds) = explode(':', $this->element->getValue()); ?> <dt> <?= $this->formLabel($this->element->getName(), $this->element->getLabel()); ?> </dt> <dd> <select id="<?= $this->element->getName();?>"> <option value="00">00</option> <option value="01">01</option> <option value="02">02</option> <option value="03">03</option> <option value="04">04</option> <option value="05">05</option> <option value="06">06</option> <option value="07">07</option> <option value="08">08</option> <option value="09">09</option> <option value="10">10</option> <option value="11">11</option> <option value="12">12</option> <option value="13">13</option> <option value="14">14</option> <option value="15">15</option> <option value="16">16</option> <option value="17">17</option> <option value="18">18</option> <option value="19">19</option> <option value="20">20</option> <option value="21">21</option> <option value="22">22</option> <option value="23">23</option> </select> <select id="<?= $this->element->getName();?>"> <option value="00">00</option> <option value="15">15</option> <option value="30">30</option> <option value="45">45</option> </select> <input id="<?= $this->element->getName(); ?>" type="hidden" name="<?= $this->element->getName(); ?>[]" value="00" /> <?php if(count($this->element->getMessages()) > 0): ?> <?= $this->formErrors($this->element->getMessages()); ?> <?php endif; ?> </dd> My problem is that sometimes i want to set a default selected value to my selecboxes when I populate my form. The question is how? Is there anyone that could help me out with this? Thanks.

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• Why is distributed source control considered harder?

  - by Will Robertson

  It seems rather common (around here, at least) for people to recommend SVN to newcomers to source control because it's "easier" than one of the distributed options. As a very casual user of SVN before switching to Git for many of my projects, I found this to be not the case at all. It is conceptually easier to set up a DCVS repository with git init (or whichever), without the problem of having to set up an external repository in the case of SVN. And the base functionality between SVN, Git, Mercurial, Bazaar all use essentially identical commands to commit, view diffs, and so on. Which is all a newcomer is really going to be doing. The small difference in the way Git requires changes to be explicitly added before they're committed, as opposed to SVN's "commit everything" policy, is conceptually simple and, unless I'm mistaken, not even an issue when using Mercurial or Bazaar. So why is SVN considered easier? I would argue that this is simply not true.

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• UIView remove itself from UIScrollView

  - by alex25

  Hi! Following Scenario: I have a = UIViewController A that contains a UIScrollView I have a second UIViewController "B" (amongst other things it contains a button) and add it to the ScrollView of A myView *mView = [[myView alloc] init]; [myScrollView addSubview:mView.view]; Is there a way that once the button is pressed that it(view) removes itself from the scrollview? I thought in the direction of setting the delegate of mView to "A" ?! But not sure how that should work in detail.... Any suggestions? Thanks!

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• How to discover table properties from SQLAlchemy mapped object

  - by ssaboum

  Hi, My point is i have a class mapped with a table, in my case in a declarative way, and i want to "discover" table properties, columns, names, relations, from this class : engine = create_engine('sqlite:///' + databasePath, echo=True) # setting up root class for declarative declaration Base = declarative_base(bind=engine) class Ship(Base): __tablename__ = 'ships' id = Column(Integer, primary_key=True) name = Column(String(255)) def __init__(self, name): self.name = name def __repr__(self): return "<Ship('%s')>" % (self.name) So now my goal is from the "Ship" class to get the table columns and their properties from another piece of code. I guess i can deal with it using instrumentation but is there any way provided by the SQLAlchemy API ? Thank you.

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• How do you fix "Too many open files" problem in Hudson?

  - by Randyaa

  We use Hudson as a continuous integration system to execute automated builds (nightly and based on CVS polling) of a lot of our projects. Some projects poll CVS every 15 minutes, some others poll every 5 minutes and some poll every hour. Every few weeks we'll get a build that fails with the following output: FATAL: java.io.IOException: Too many open files java.io.IOException: java.io.IOException: Too many open files at java.lang.UNIXProcess.<init>(UNIXProcess.java:148) The next build always worked (with 0 changes) so we always chalked it up to 2 build jobs being run at the same time and happening to have too many files open during the process. This weekend we had a build fail Friday night (automatic nightly build) with the message and every other nightly build also failed. Somehow this triggered Hudson to continuously build every project which failed until the issue was resolved. This resulted in a build every 30 minutes or so of every project until sometime Saturday night when the issue magically disappeared.

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• Access violation reading location 0x00184000.

  - by numerical25

  having troubles with the following line HR(md3dDevice->CreateBuffer(&vbd, &vinitData, &mVB)); it appears the CreateBuffer method is having troubles reading &mVB. mVB is defined in box.h and looks like this ID3D10Buffer* mVB; Below is the code it its entirety. this is all files that mVB is in. //Box.cpp #include "Box.h" #include "Vertex.h" #include <vector> Box::Box() : mNumVertices(0), mNumFaces(0), md3dDevice(0), mVB(0), mIB(0) { } Box::~Box() { ReleaseCOM(mVB); ReleaseCOM(mIB); } float Box::getHeight(float x, float z)const { return 0.3f*(z*sinf(0.1f*x) + x*cosf(0.1f*z)); } void Box::init(ID3D10Device* device, float m, float n, float dx) { md3dDevice = device; mNumVertices = m*n; mNumFaces = 12; float halfWidth = (n-1)*dx*0.5f; float halfDepth = (m-1)*dx*0.5f; std::vector<Vertex> vertices(mNumVertices); for(DWORD i = 0; i < m; ++i) { float z = halfDepth - (i * dx); for(DWORD j = 0; j < n; ++j) { float x = -halfWidth + (j* dx); float y = getHeight(x,z); vertices[i*n+j].pos = D3DXVECTOR3(x, y, z); if(y < -10.0f) vertices[i*n+j].color = BEACH_SAND; else if( y < 5.0f) vertices[i*n+j].color = LIGHT_YELLOW_GREEN; else if (y < 12.0f) vertices[i*n+j].color = DARK_YELLOW_GREEN; else if (y < 20.0f) vertices[i*n+j].color = DARKBROWN; else vertices[i*n+j].color = WHITE; } } D3D10_BUFFER_DESC vbd; vbd.Usage = D3D10_USAGE_IMMUTABLE; vbd.ByteWidth = sizeof(Vertex) * mNumVertices; vbd.BindFlags = D3D10_BIND_VERTEX_BUFFER; vbd.CPUAccessFlags = 0; vbd.MiscFlags = 0; D3D10_SUBRESOURCE_DATA vinitData; vinitData.pSysMem = &vertices; HR(md3dDevice->CreateBuffer(&vbd, &vinitData, &mVB)); //create the index buffer std::vector<DWORD> indices(mNumFaces*3); // 3 indices per face int k = 0; for(DWORD i = 0; i < m-1; ++i) { for(DWORD j = 0; j < n-1; ++j) { indices[k] = i*n+j; indices[k+1] = i*n+j+1; indices[k+2] = (i*1)*n+j; indices[k+3] = (i*1)*n+j; indices[k+4] = i*n+j+1; indices[k+5] = (i*1)*n+j+1; k+= 6; } } D3D10_BUFFER_DESC ibd; ibd.Usage = D3D10_USAGE_IMMUTABLE; ibd.ByteWidth = sizeof(DWORD) * mNumFaces*3; ibd.BindFlags = D3D10_BIND_INDEX_BUFFER; ibd.CPUAccessFlags = 0; ibd.MiscFlags = 0; D3D10_SUBRESOURCE_DATA iinitData; iinitData.pSysMem = &indices; HR(md3dDevice->CreateBuffer(&ibd, &iinitData, &mIB)); } void Box::Draw() { UINT stride = sizeof(Vertex); UINT offset = 0; md3dDevice->IASetVertexBuffers(0, 1, &mVB, &stride, &offset); md3dDevice->IASetIndexBuffer(mIB, DXGI_FORMAT_R32_UINT, 0); md3dDevice->DrawIndexed(mNumFaces*3, 0 , 0); } //Box.h #ifndef _BOX_H #define _BOX_H #include "d3dUtil.h" Box.h class Box { public: Box(); ~Box(); void init(ID3D10Device* device, float m, float n, float dx); void Draw(); float getHeight(float x, float z)const; private: DWORD mNumVertices; DWORD mNumFaces; ID3D10Device* md3dDevice; ID3D10Buffer* mVB; ID3D10Buffer* mIB; }; #endif Thanks again for the help

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• When to release a class with delegates

  - by Stefan Mayr

  A quick question to delegates. Lets say, CLASSA has a delegate defined: @protocol MyDelegate -(void) didFinishUploading; @end In CLASSB I create an instance of CLASS A -(void) doPost { CLASSA *uploader = [[CLASSA alloc] init]; uploader.delegate = self; // this means CLASSB has to implement the delegate uploader.post; } and also in CLASSB: -(void)didFinishUploding { } So when do I have to release the uploader? Because when I release it in doPost, it is not valid anymore in didFinishUploading. Thanks

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• preventing selection on MKPointAnnotation

  - by Derek

  Is there a way to prevent an annotation in a MKMapView instance from being enabled. In other words, when the user taps the red pin on the map, is there a way to prevent it from highlighting the pin. Right now the pin turns dark when touched... Edit: I'm using the following code to return the MKPinAnnotationView // To future MKMapView users - Don't forget to set _mapView's delegate _mapView.delegate = self; _annotation = [[MKPointAnnotation alloc] init]; _annotation.coordinate = myLocation; [_mapView addAnnotation:_annotation]; -(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{ MKPinAnnotationView *pin = [[MKPinAnnotationView alloc] initWithAnnotation:_annotation reuseIdentifier:@"id"]; pin.enabled = NO; return pin; }

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• Core data storage is repeated...

  - by Kamlesh

  Hi all, I am trying to use Core Data in my application and I have been succesful in storing data into the entity.The data storage is done in the applicationDidFinishLaunchingWithOptions() method.But when I run the app again,it again gets saved.So how do I check if the data is already present or not?? Here is the code(Saving):-`NSManagedObjectContext *context = [self managedObjectContext]; NSManagedObject *failedBankInfo = [NSEntityDescription insertNewObjectForEntityForName:@"FailedBankInfo" inManagedObjectContext:context]; [failedBankInfo setValue:@"Test Bank" forKey:@"name"]; [failedBankInfo setValue:@"Testville" forKey:@"city"]; [failedBankInfo setValue:@"Testland" forKey:@"state"]; NSError *error; if (![context save:&error]) { NSLog(@"Whoops, couldn't save: %@", [error localizedDescription]); } (Retrieving):- NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"FailedBankInfo" inManagedObjectContext:context]; [fetchRequest setEntity:entity]; NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error]; for (NSManagedObject *info in fetchedObjects) { NSLog(@"Name: %@", [info valueForKey:@"name"]); } `

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• Python 3.0 - Dynamic Class Instance Naming

  - by Jon

  I want to use a while loop to initialize class objects with a simple incremented naming convention. The goal is to be able to scale the number of class objects at will and have the program generate the names automatically. (ex. h1...h100...h1000...) Each h1,h2,h3... being its own instance. Here is my first attempt... have been unable to find a good example. class Korker(object): def __init__(self,ident,roo): self.ident = ident self.roo = roo b = 1 hwinit = 'h' hwstart = 0 while b <= 10: showit = 'h' + str(b) print(showit) #showit seems to generate just fine as demonstrated by print str(showit) == Korker("test",2) #this is the line that fails b += 1 The errors I get range from a string error to a cannot use function type error.... Any help would be greatly appreciated.

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• Core Data Predicate To Many

  - by Vikings

  I have a core data model that has a one to many relationship, there is a category, and it can contain many subcategories. Category <---- Subcategory I am trying to perform a fetch that checks if a particular Category contains a Subcategory with a particular name. Let's say I have two categories below, I want to fetch to see if there are any subcategories name "Apple" in the Category named "Fruits". Vetegables - Carrot - Lettuce Fruits - Apple - Orange - Pear Code: - (SubCategory *)searchForSubCategoryWithName:(NSString *)subCategory inCategory:(Category *)category { NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"SubCategory" inManagedObjectContext:self.beer.managedObjectContext]; [fetchRequest setEntity:entity]; NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name == [c] %@", subCategory]; [fetchRequest setPredicate:predicate]; NSError *error; NSArray *fetchedObjects = [self.beer.managedObjectContext executeFetchRequest:fetchRequest error:&error]; if (fetchedObjects != nil && fetchedObjects.count > 0) { return [fetchedObjects objectAtIndex:0]; } else { return nil; } }

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• Putting data from SONObjectWithData to UITableView

  - by user2966615

  i am building a app in which i am getting data from a php file and already NSLoging it in xcode and it is showing data in this format: jsonObject=( ( 1, abc, "[email protected]", "501 B3 Town" ), ( 2, sam, "[email protected]", "502 B3 Town" ), ( 3, jhon, "[email protected]", "503 B Town" ) ) and here is my viewdidload - (void)viewDidLoad { [super viewDidLoad]; statuses=[[NSMutableArray alloc]init]; NSURL *myURL = [NSURL URLWithString:@"http://url/result.php"]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:myURL cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:60]; [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) { NSLog(@"Finished with status code: %i", [(NSHTTPURLResponse *)response statusCode]); id jsonObject = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil]; NSLog(@"jsonObject=%@",jsonObject); statuses = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error]; }]; } now i want to display all records in uitableview. can anyone tell me how can i do that. Thanks

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• RubyMotion Error When Using setTranslucent

  - by Sam Morris

  I'm getting the following error when trying rake a project I'm working on, and I can't figure out why. The message happens no matter what variable I sent it. Objective-C stub for message `setTranslucent:' type `v@:c' not precompiled. Make sure you properly link with the framework or library that defines this message Here's my app_delegate file for reference. class AppDelegate def application(application, didFinishLaunchingWithOptions:launchOptions) navigation_appearance @window = UIWindow.alloc.initWithFrame(UIScreen.mainScreen.bounds) tableView = StopsController.alloc.init @window.rootViewController = UINavigationController.alloc.initWithRootViewController(tableView) @window.makeKeyAndVisible true end def navigation_appearance UINavigationBar.appearance.setBackgroundImage UIImage.imageNamed('navbar_bg.png'), forBarMetrics: UIBarMetricsDefault UINavigationBar.appearance.setTranslucent(true) UINavigationBar.appearance.setShadowImage UIImage.imageNamed('navbar_shadow.png') end end

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• Can getAttribute() method of Tomcat ServletContext implementation be called without synchronization?

  - by oo_olo_oo

  I would like to read some parameters during servlet initializtion (in init() method), and store them among servlet context attributes (using getServletContext().setAttribute()). I would like to read these parameters later - during some request processing (using getServletContext().getAttribute()). So, the multiple threads could do this simultaneously. My question is if such an attempt is safe? Could I be sure that multi threaded calls to the getAttribute() don't mess up any internal state of the servlet context? Please take into account that I'm not going to call the setAttribute() anywhere besides the initialization. So, only calls to the getAttribute() are going to be done from multiple threads. But depending on the internal implementation, this also could be dangerous. So, any information about Tomcat's implementation would be appreciated.

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• How to show the elapsed time on a long Query execution?

  - by Salvador

  i need to show a popup window before the a query execution, and close that windows when the query ends. actually i do something like this var frm : tFrmPopupElapsed; // this form have a ttimer and a tlabel to show the elapsed time //but the tlabel is not updated, i tried using update; and refresh; but nothing happens //the timer is enabled. begin frm:=tform.create(nil); frm.Init;//this procedure set the timer to enabled:=true try frm.Show(); ExecuteMyVeryLongQuery(); finally frm.Close; end; end; wich is the best way using a ttimer? a Tthread ? thanks in advance.

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• Deploying rails app on phusion passenger + Nginx

  - by user1028432

  I installed passenger + nginx: gem install passenger , passenger-install-nginx-module , and making init script nginx conf(/opt/nginx/conf/nginx.conf): worker_processes 1; events { worker_connections 1024; } http { passenger_root /home/rusik/.rvm/gems/ruby-2.0.0-p247@work/gems/passenger-4.0.21; passenger_ruby /home/rusik/.rvm/wrappers/ruby-2.0.0-p247@work/ruby; include mime.types; default_type application/octet-stream; sendfile on; rails_env development; server { listen 80; server_name www.myapp.com; charset utf-8; root /home/rusik/www/testapp/public; passenger_enabled on; } } restarting nginx , and page www.myapp.com doesn't load , what can be a problem?(changeing rails_env i tried , rails s i running) I am trying a lot of time to make it works , but can't , i am also tryed install through apt repositiry, but the problem is the same , the page doesn't loaded!

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• How do I set up the Clojure classpath in Emacs after installing with ELPA?

  - by derefed

  I'm trying to add paths to my classpath in the Clojure REPL that I've set up in Emacs using ELPA. Apparently, this isn't the $CLASSPATH environment variable, but rather the swank-clojure-classpath variable that Swank sets up. Because I used ELPA to install Swank, Clojure, etc., there are a ton of .el files that take care of everything instead of my .emacs file. Unfortunately, I can't figure out how to change the classpath now. I've tried using (setq 'swank-clojure-extra-classpaths (list ...)) both before and after the ELPA stuff in my .emacs, and I've tried adding paths directly to swank-clojure-classpath in .emacs, .emacs.d/init.el, and .emacs.d/user/user.el, but nothing works. What I'm ultimately trying to do is to add both the current directory "." and the directory in which I keep my Clojure programs. I'm assuming swank-clojure-classpath is the thing I need to set here. Thanks for your help.

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• How can I "override" deepcopy in Python?

  - by Az

  Hi there, I'd like to override __deepcopy__ for a given SQLAlchemy-mapped class such that it ignores any SQLA attributes but deepcopies everything else that's part of the class. I'm not particularly familiar with overriding any of Python's built-in objects in particular but I've got some idea as to what I want. Let's just make a very simple class User that's mapped using SQLA. class User(object): def __init__(self, user_id, name): self.user_id = user_id self.name = name I've used dir() to see, before and after mapping, what SQLAlchemy-specific attributes there are and I've found _sa_class_manager and _sa_instance_state. Provided those are the only ones how would I ignore that when defining __deepcopy__? Also, are there any attributes the SQLA injects into the mapped object? (I asked this in a previous question (as an edit a few days after I selected an answer to the main question, though) but I think I missed the train there. Apologies for that.)

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