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• Python sudoku programming

  - by trevor

  I need your help on this. I have this program and I must finish it. It's missing 3 parts. Here is the program I'm working with: import copy def display(A): if A: for i in range(9): for j in range(9): if type(A[i][j]) == type([]): print A[i][j][0], else: print A[i][j], print print else: print A def has_conflict(A): for i in range(9): for j in range(9): for (x,y) in get_neighbors(i,j): if len(A[i][j])==1 and A[i][j]==A[x][y]: return True return False # HERE ARE THE PARTS THAT REQUIRE HELP!!!! def get_neighbors(x,y): return [] def update(A, i, j, value): return [] def solve(A): return [] # ENDS PARTS THAT REQUIRE HELP!!!! A = [] infile = open('puzzle1.txt', 'r') for i in range(9): A += [[]] for j in range(9): num = int(infile.read(2)) if num: A[i] += [[num]] else: A[i] += [[1,2,3,4,5,6,7,8,9]] for i in range(9): for j in range(9): if len(A[i][j])==1: A = update(A, i,j, A[i][j][0]) if A==[]: break if A==[]: break if A<>[]: A = solve(A) display(A) I need to solve the stuff formerly in bold letters, now explicitly marked in the code, specifically - get_neighbors(): - update(): - solve(): Thank you for your time and help.

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• UnicodeEncodeError when uploading files in Django admin

  - by Samuel Linde

  Note: I asked this question on StackOverflow, but I realize this might be a more proper place to ask this kind of question. I'm trying to upload a file called 'Testaråäö.txt' via the Django admin app. I'm running Django 1.3.1 with Gunicorn 0.13.4 and Nginx 0.7.6.7 on a Debian 6 server. Database is PostgreSQL 8.4.9. Other Unicode data is saved to the database with no problem, so I guess the problem must be with the filesystem somehow. I've set http { charset utf-8; } in my nginx.conf. LC_ALL and LANG is set to 'sv_SE.UTF-8'. Running 'locale' verifies this. I even tried setting LC_ALL and LANG in my nginx init script just to make sure locale is set properly. Here's the traceback: Traceback (most recent call last): File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/core/handlers/base.py", line 111, in get_response response = callback(request, *callback_args, **callback_kwargs) File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/contrib/admin/options.py", line 307, in wrapper return self.admin_site.admin_view(view)(*args, **kwargs) File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/utils/decorators.py", line 93, in _wrapped_view response = view_func(request, *args, **kwargs) File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/views/decorators/cache.py", line 79, in _wrapped_view_func response = view_func(request, *args, **kwargs) File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/contrib/admin/sites.py", line 197, in inner return view(request, *args, **kwargs) File "/srv/django/letebo/app/cms/admin.py", line 81, in change_view return super(PageAdmin, self).change_view(request, obj_id) File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/utils/decorators.py", line 28, in _wrapper return bound_func(*args, **kwargs) File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/utils/decorators.py", line 93, in _wrapped_view response = view_func(request, *args, **kwargs) File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/utils/decorators.py", line 24, in bound_func return func(self, *args2, **kwargs2) File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/db/transaction.py", line 217, in inner res = func(*args, **kwargs) File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/contrib/admin/options.py", line 985, in change_view self.save_formset(request, form, formset, change=True) File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/contrib/admin/options.py", line 677, in save_formset formset.save() File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/forms/models.py", line 482, in save return self.save_existing_objects(commit) + self.save_new_objects(commit) File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/forms/models.py", line 613, in save_new_objects self.new_objects.append(self.save_new(form, commit=commit)) File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/forms/models.py", line 717, in save_new obj.save() File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/db/models/base.py", line 460, in save self.save_base(using=using, force_insert=force_insert, force_update=force_update) File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/db/models/base.py", line 504, in save_base self.save_base(cls=parent, origin=org, using=using) File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/db/models/base.py", line 543, in save_base for f in meta.local_fields if not isinstance(f, AutoField)] File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/db/models/fields/files.py", line 255, in pre_save file.save(file.name, file, save=False) File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/db/models/fields/files.py", line 92, in save self.name = self.storage.save(name, content) File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/core/files/storage.py", line 48, in save name = self.get_available_name(name) File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/core/files/storage.py", line 74, in get_available_name while self.exists(name): File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/core/files/storage.py", line 218, in exists return os.path.exists(self.path(name)) File "/srv/.virtualenvs/letebo/lib/python2.6/genericpath.py", line 18, in exists st = os.stat(path) UnicodeEncodeError: 'ascii' codec can't encode characters in position 52-54: ordinal not in range(128) I tried running Gunicorn with debugging turned on, and the file uploads without any problem at all. I suppose this must mean that the issue is with Nginx. Still beats me where to look, though. Here are the raw response headers from Gunicorn and Nginx, if it makes any sense: Gunicorn: HTTP/1.1 302 FOUND Server: gunicorn/0.13.4 Date: Thu, 09 Feb 2012 14:50:27 GMT Connection: close Transfer-Encoding: chunked Expires: Thu, 09 Feb 2012 14:50:27 GMT Vary: Cookie Last-Modified: Thu, 09 Feb 2012 14:50:27 GMT Location: http://my-server.se:8000/admin/cms/page/15/ Cache-Control: max-age=0 Content-Type: text/html; charset=utf-8 Set-Cookie: messages="yada yada yada"; Path=/ Nginx: HTTP/1.1 500 INTERNAL SERVER ERROR Server: nginx/0.7.67 Date: Thu, 09 Feb 2012 14:50:57 GMT Content-Type: text/html; charset=utf-8 Transfer-Encoding: chunked Connection: close Vary: Cookie 500 UPDATE: Both locale.getpreferredencoding() and sys.getfilesystemencoding() outputs 'UTF-8'. locale.getdefaultlocale() outputs ('sv_SE', 'UTF8'). This seem correct to me, so I'm still not sure why I keep getting these errors.

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• Using Lambda Expressions trees with IEnumerable

  - by Loathian

  I've been trying to learn more about using Lamba expression trees and so I created a simple example. Here is the code, this works in LINQPad if pasted in as a C# program. void Main() { IEnumerable<User> list = GetUsers().Where(NameContains("a")); list.Dump("Users"); } // Methods public IEnumerable<User> GetUsers() { yield return new User{Name = "andrew"}; yield return new User{Name = "rob"}; yield return new User{Name = "chris"}; yield return new User{Name = "ryan"}; } public Expression<Func<User, bool>> NameContains(string namePart) { return u => u.Name.Contains(namePart); } // Classes public class User { public string Name { get; set; } } This results in the following error: The type arguments for method 'System.Linq.Enumerable.Where(System.Collections.Generic.IEnumerable, System.Func)' cannot be inferred from the usage. Try specifying the type arguments explicitly. However if I just substitute the first line in main with this: IEnumerable<User> list = GetUsers().Where(u => u.Name.Contains("a")); It works fine. Can tell me what I'm doing wrong, please?

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• Tail-recursive pow() algorithm with memoization?

  - by Dan

  I'm looking for an algorithm to compute pow() that's tail-recursive and uses memoization to speed up repeated calculations. Performance isn't an issue; this is mostly an intellectual exercise - I spent a train ride coming up with all the different pow() implementations I could, but was unable to come up with one that I was happy with that had these two properties. My best shot was the following: def calc_tailrec_mem(base, exp, cache_line={}, acc=1, ctr=0): if exp == 0: return 1 elif exp == 1: return acc * base elif exp in cache_line: val = acc * cache_line[exp] cache_line[exp + ctr] = val return val else: cache_line[ctr] = acc return calc_tailrec_mem(base, exp-1, cache_line, acc * base, ctr + 1) It works, but it doesn't memorize the results of all calculations - only those with exponents 1..exp/2 and exp.

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• JavaScript setTimeout setInterval within one function

  - by dagoof

  I think I might be overtired but I cannot for the life of me make sense of this, and I think it's due to a lack of knowledge of javascript var itv=function(){ return setInterval(function(){ sys.puts('interval'); }, 1000); } var tout=function(itv){ return setTimeout(function(){ sys.puts('timeout'); clearInterval(itv); }, 5500); } With these two functions I can call a=tout(itv()); and get a looping timer to run for 5.5 seconds and then exit, essentially. By my logic, this should work but it simply is not var dotime=function(){ return setTimeout(function(){ clearInterval(function(){ return setInterval(function(){ sys.puts("interval"); }, 1000); }); }, 5500); } any insight in this matter would be appreciated.

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• Problems with Routing URLs using CGI and Bottle.py

  - by Risingson

  I've been having difficulty getting anything more than a simple index / to return correctly using bottle.py in a CGI environment. When I try to return /hello I get a 404 response. However, if I request /index.py/hello import bottle from bottle import route @route('/') def index(): return 'Index' @route('/hello') def hello(): return 'Hello' if __name__ == '__main__': from wsgiref.handlers import CGIHandler CGIHandler().run(bottle.default_app()) And here is my .htaccess file DirectoryIndex index.py <ifmodule mod_rewrite.c=""> RewriteEngine on RewriteBase / RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.*)$ /index.py/$1 [L] </ifmodule> I copied much of the code from here as I'm using DH and it seemed relevant: http://blog.coderonfire.com/2010/02/running-bottle-python-micro-framework.html Thanks for helping.

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• Passing parameters on the stack

  - by oxinabox.ucc.asn.au

  When you pass parameters to a function on the cpu stack, You put the parameters on then JSR puts the return address on the stack. So that means in your function you must take the top item of the stack (the return address) before you can take the others off) eg is the following the correct way to go about it: ... |Let’s do some addition with a function, MOVE.L #4, -(SP) MOVE.L #5, -(SP) JSR add |the result of the addition (4+5) is in D0 (9) ... add: MOVE.L (SP)+, A1 |store the return address |in a register MOVE.L (SP)+, D0 |get 1st parameter, put in D0 MOVE.L (SP)+, D2 |get 2nd parameter, put in D2 ADD.L D2, D0 |add them, |storing the result in D0 MOVE.L A1, -(SP) |put the address back on the |Stack RTS |return

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• unarchiveObjectWithFile retain / autorelease needed?

  - by fuzzygoat

  Just a quick memory management question if I may ... Is the code below ok, or should I be doing a retain and autorelease, I get the feeling I should. But as per the rules unarchiveObjectWithFile does not contain new, copy or alloc. -(NSMutableArray *)loadGame { if([[NSFileManager defaultManager] fileExistsAtPath:[self pathForFile:@"gameData.plist"]]) { NSMutableArray *loadedGame = [NSKeyedUnarchiver unarchiveObjectWithFile:[self pathForFile:@"gameData.plist"]]; return loadedGame; } else return nil; } or -(NSMutableArray *)loadGame { if([[NSFileManager defaultManager] fileExistsAtPath:[self pathForFile:@"gameData.plist"]]) { NSMutableArray *loadedGame = [[NSKeyedUnarchiver unarchiveObjectWithFile:[self pathForFile:@"gameData.plist"]] retain]; return [loadedGame autorelease]; } else return nil; } gary

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• ASP .NET - Substitution and page output (donut) caching - How to pass custom argument to HttpRespons

  - by zzare

  I would like to use substitution feature of donut caching. public static string GetTime(HttpContext context) { return DateTime.Now.ToString("T"); } ... The cached time is: <%= DateTime.Now.ToString("T") %> <hr /> The substitution time is: <% Response.WriteSubstitution(GetTime); %> ...But I would like to pass additional parameter to callback function beside HttpContext. so the question is: How to pass additional argument to GetTime callback? for instance, something like this: public static string GetTime(HttpContext context, int newArgument) { // i'd like to get sth from DB by newArgument // return data depending on the db values // ... this example is too simple for my usage if (newArgument == 1) return ""; else return DateTime.Now.ToString("T"); }

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• How do I sort an array of Person Objects by using compareto()?

  - by Adam

  Here is my code: > import java.util.Scanner; import java.util.Arrays; /** This class tests the Person class. */ public class PersonDemo { public static void main(String[] args) { int count = 0; Scanner in = new Scanner(System.in); boolean more = false; Person first = null; Person last = null; while (more) { System.out.println( "Please enter the person's name or a blank line to quit"); String name = in.nextLine(); if (name.equals("")) more = false; else { Person p = new Person(name); //new person object created with inputted name Person[] people = new Person[10]; //new array of 10 person objects people[count] = p; //declare person object with index of variable count as the new person object first = people[count]; // I have no idea what to do here. This is where I'm stuck. last = people[count]; // I can't figure out what to do with this either. first.compareTo(p); //call compareTo method on first and new person object last.compareTo(p); //call compareTo method on last and new person object count++; // increase count variable } } System.out.println("First: " + first.toString()); System.out.println("Last: " + last.toString()); } } And the Person class: /** A person with a name. */ public class Person implements Comparable { /** * Constructs a Person with a name. * @param aName the person's name */ public Person(String aName) { name = aName; } public String getName() { return name; } @Override public int compareTo(Object otherObject) { Person other = (Person)otherObject; if (name.compareTo(other.name) < 0) return -1; if (name.compareTo(other.name) > 0) return 1; return 0; } /** Returns a string representation of the object. @return name of Person */ public String toString() { return "[name=" + name + "]"; } private String name; }

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• Safely remove window subclassing?

  - by Vegard Larsen

  I am trying to subclass the currently focused window on a Windows system using a global CBT hook. This is related to what happens in this question, but the bug is different. What happens when this subclassing is in effect, is that Opera's (version 10.50) main window is prevented from displaying. Opera has a "splash screen" where you are required to click "Start" for the main window to show that appears after Opera has not shut down properly. Whenever this window pops up, Opera's main window won't show. If Opera was shut down properly, and this splash screen does not show, the main window displays as it should. HHOOK hHook; HWND hWndSubclass = 0; void SubclassWindow(HWND hWnd) { Unsubclass(); FARPROC lpfnOldWndProc = (FARPROC)SetWindowLongPtr(hWnd, GWLP_WNDPROC, (LPARAM)SubClassFunc); SetProp(hWnd, L"PROP_OLDWNDPROC", lpfnOldWndProc); hWndSubclass = hWnd; } void Unsubclass() { if (hWndSubclass != 0 && IsWindow(hWndSubclass)) { FARPROC lpfnOldWndProc = (FARPROC)GetProp(hWndSubclass, L"PROP_OLDWNDPROC"); RemoveProp(hWndSubclass, L"PROP_OLDWNDPROC"); SetWindowLongPtr(hWndSubclass, GWLP_WNDPROC, (LPARAM)lpfnOldWndProc); hWndSubclass = 0; } } static LRESULT CALLBACK SubClassFunc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { if (message == WM_MOVING) { // do something irrelevant } else if (message == WM_DESTROY) { Unsubclass(); } FARPROC lpfnOldWndProc = (FARPROC)GetProp(hWndSubclass, L"PROP_OLDWNDPROC"); return CallWindowProc((WNDPROC)lpfnOldWndProc, hWndSubclass, message, wParam, lParam); } static LRESULT CALLBACK CBTProc(int nCode, WPARAM wParam, LPARAM lParam) { if (nCode == HCBT_SETFOCUS && hWndServer != NULL) { SubclassWindow((HWND)wParam); } if (nCode < 0) { return CallNextHookEx(hHook, nCode, wParam, lParam); } return 0; } BOOL APIENTRY DllMain( HINSTANCE hInstance, DWORD Reason, LPVOID Reserved ) { switch(Reason) { case DLL_PROCESS_ATTACH: hInst = hInstance; return TRUE; case DLL_PROCESS_DETACH: Unsubclass(); return TRUE; } return TRUE; } My suspicion is that Opera's main window is somehow already subclassed. I imagine the following is happening: The window is created with it's own basic WndProc, and is given focus My application subclasses the window, storing the original WndProc Opera subclasses its own window When the window loses focus, I restore the original WndProc, thus ignoring the second WndProc Can this really be the case? Are there any other explanations?

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• how to load multiple images in iCarousel using this code?

  - by Dany

  i'm loading bunch of images in coverflow using i carousel but i'm not getting it?..initially i got Signal sigabart issue..after i edited some of the code the view gets displayed...Am i missing something?... #import "CollectionViewController.h" @interface CollectionViewController () @property (nonatomic, retain) NSMutableArray *items; @end @implementation CollectionViewController @synthesize carousel; @synthesize items; - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self; } - (void)dealloc { carousel.delegate = nil; carousel.dataSource = nil; [items release]; [carousel release]; [super dealloc]; } - (void)viewDidLoad { [super viewDidLoad]; carousel.type = iCarouselTypeCoverFlow2; } - (void)viewDidUnload { [super viewDidUnload]; self.carousel = nil; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationPortrait); } #pragma mark - #pragma mark iCarousel methods - (NSUInteger)numberOfItemsInCarousel:(iCarousel *)carousel { return [items count]; } - (NSUInteger)numberOfVisibleItemsInCarousel:(iCarousel *)carousel { return 29; } - (UIView *)carousel:(iCarousel *)carousel viewForItemAtIndex:(NSUInteger)index reusingView:(UIView *)view { //create new view if no view is available for recycling if (view == nil) { view = [NSArray arrayWithObjects:[UIImage imageNamed:@"gal1.jpg"], [UIImage imageNamed:@"gal2.jpg"], [UIImage imageNamed:@"gal3.jpg"], [UIImage imageNamed:@"gal5.jpg"], [UIImage imageNamed:@"gal6.jpg"], [UIImage imageNamed:@"gal7.jpg"], [UIImage imageNamed:@"gal8.jpg"], [UIImage imageNamed:@"gal9.jpg"], [UIImage imageNamed:@"gal10.jpg"], [UIImage imageNamed:@"gal11.jpg"], [UIImage imageNamed:@"gal12.jpg"], [UIImage imageNamed:@"gal13.jpg"], [UIImage imageNamed:@"gal14.jpg"], [UIImage imageNamed:@"gal15.jpg"], [UIImage imageNamed:@"gal16.jpg"], [UIImage imageNamed:@"gal17.jpg"], [UIImage imageNamed:@"gal18.jpg"], [UIImage imageNamed:@"gal19.jpg"], [UIImage imageNamed:@"gal20.jpg"], [UIImage imageNamed:@"gal21.jpg"], [UIImage imageNamed:@"gal22.jpg"], [UIImage imageNamed:@"gal23.jpg"], [UIImage imageNamed:@"gal24.jpg"], [UIImage imageNamed:@"gal25.jpg"], [UIImage imageNamed:@"gal26.jpg"], [UIImage imageNamed:@"gal27.jpg"], [UIImage imageNamed:@"gal28.jpg"], } else { } return view; } @end while running on simulator i just get the screen not images?...i got stuck here....

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• Covariance in Java

  - by Bobby

  Why does the following not work in Java? It would work in C#: public static final List<String> Split(String str, char delimiter) { if ((str == null) || "".equals(str)) { return new CopyOnWriteArrayList<String>(); } } I get an error saying this method has to return List. CopyOnWriteArrayList implements the List interface. Why does covariance not apply on return values in Java?

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• Creating a castable entity class wrapper

  - by Tony

  Hi I need to have a wrapper class that exposes some properties of my entity class called ProfileEntity. I tried doing it by deriving from this entity and then creating properties that return specific entity properties, but it says I cannot cast from ProfileEntity to ProfileEntityWrapper. When I try to put the return values of a method that returns a 'ProfileEntity' into the wrapper I get the above error. How do I create such a wrapper class that is castable? Example class ProfileEntityWrapper : ProfileEntity { public string Name { get { return this.ProfileEntityName; } } public class Someclass { public ProfileEntity SomeMethod() { return ProfileEntity; // example of method returning this object } } public class SomeOtherlClass { SomeClass sc = new SomeClass(); public void DoSomething() { ProfileEntityWrapper ew = (ProfileEntityWrapper)sc.SomeMethod(); // Cannot do this cast!!! } }

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• Django users and authentication from external source

  - by Boldewyn

  I have a Django app that gets it's data completely from an external source (queried via HTTP). That is, I don't have the option for a local database. Session data is stored in the cache (on my development server I use a SQLite database, so that is no error source). I'm using bleeding edge Django 1.1svn. Enter the problem: I want to use Django's own authentication system for the users. It seems quite simple to write my own Authentication Backend, but always just under the condition that you have a local database where to save the users. Without database my main problem is persistence. I tried it with the following (assume that datasource.get() is a function that returns some kind of dict): class ModelBackend (object): """Login backend.""" def authenticate (self, username=None, password=None): """Check, if a given user/password combination is valid""" data = datasource.get ('login', username, password) if data and data['ok']: return MyUser (username=username) else: raise TypeError return None def get_user (self, username): """get data about a specific user""" try: data = datasource.get ('userdata', username) if data and data['ok']: return data.user except: pass return None class MyUser (User): """Django user who isn't saved in DB""" def save (self): return None But the intentionally missing save() method on MyUser seems to break the session storage of a login. How should MyUser look like without a local database?

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• Warning: control reaches end of non-void function - iPhone

  - by Dave

  I keep getting 'warning: control reaches end of non-void function' with this code: - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { if (section ==0) { return [comparativeList count]; } if (section==1) { return [generalList count]; } if (section==2) { return [contactList count]; How can I get rid of this warning? Thanks.

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• Django, want to upload eather image (ImageField) or file (FileField)

  - by Serg

  I have a form in my html page, that prompts user to upload File or Image to the server. I want to be able to upload ether file or image. Let's say if user choose file, image should be null, and vice verso. Right now I can only upload both of them, without error. But If I choose to upload only one of them (let's say I choose image) I will get an error: "Key 'attachment' not found in <MultiValueDict: {u'image': [<InMemoryUploadedFile: police.jpg (image/jpeg)>]}>" models.py: #Description of the file class FileDescription(models.Model): TYPE_CHOICES = ( ('homework', 'Homework'), ('class', 'Class Papers'), ('random', 'Random Papers') ) subject = models.ForeignKey('Subjects', null=True, blank=True) subject_name = models.CharField(max_length=100, unique=False) category = models.CharField(max_length=100, unique=False, blank=True, null=True) file_type = models.CharField(max_length=100, choices=TYPE_CHOICES, unique=False) file_uploaded_by = models.CharField(max_length=100, unique=False) file_name = models.CharField(max_length=100, unique=False) file_description = models.TextField(unique=False, blank=True, null=True) file_creation_time = models.DateTimeField(editable=False) file_modified_time = models.DateTimeField() attachment = models.FileField(upload_to='files', blank=True, null=True, max_length=255) image = models.ImageField(upload_to='files', blank=True, null=True, max_length=255) def __unicode__(self): return u'%s' % (self.file_name) def get_fields(self): return [(field, field.value_to_string(self)) for field in FileDescription._meta.fields] def filename(self): return os.path.basename(self.image.name) def category_update(self): category = self.file_name return category def save(self, *args, **kwargs): if self.category is None: self.category = FileDescription.category_update(self) for field in self._meta.fields: if field.name == 'image' or field.name == 'attachment': field.upload_to = 'files/%s/%s/' % (self.file_uploaded_by, self.file_type) if not self.id: self.file_creation_time = datetime.now() self.file_modified_time = datetime.now() super(FileDescription, self).save(*args, **kwargs) forms.py class ContentForm(forms.ModelForm): file_name =forms.CharField(max_length=255, widget=forms.TextInput(attrs={'size':20})) file_description = forms.CharField(widget=forms.Textarea(attrs={'rows':4, 'cols':25})) class Meta: model = FileDescription exclude = ('subject', 'subject_name', 'file_uploaded_by', 'file_creation_time', 'file_modified_time', 'vote') def clean_file_name(self): name = self.cleaned_data['file_name'] # check the length of the file name if len(name) < 2: raise forms.ValidationError('File name is too short') # check if file with same name is already exists if FileDescription.objects.filter(file_name = name).exists(): raise forms.ValidationError('File with this name already exists') else: return name views.py if request.method == "POST": if "upload-b" in request.POST: form = ContentForm(request.POST, request.FILES, instance=subject_id) if form.is_valid(): # need to add some clean functions # handle_uploaded_file(request.FILES['attachment'], # request.user.username, # request.POST['file_type']) form.save() up_f = FileDescription.objects.get_or_create( subject=subject_id, subject_name=subject_name, category = request.POST['category'], file_type=request.POST['file_type'], file_uploaded_by = username, file_name=form.cleaned_data['file_name'], file_description=request.POST['file_description'], image = request.FILES['image'], attachment = request.FILES['attachment'], ) return HttpResponseRedirect(".")

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• Trying to calculate the 10001st prime number in Java.

  - by user247679

  Greetings. I am doing Problem 7 from Project Euler. What I am supposed to do is calculate the 10001st prime number. (A prime number being a number that is only divisible by itself and one.) Here is my current program: public class Problem7 { public static void main(String args []){ long numberOfPrimes = 0; long number = 2; while (numberOfPrimes < 10001){ if(isPrime(number)){ numberOfPrimes++; } number++; } System.out.println("10001st prime: "+ number); } public static boolean isPrime(long N) { if (N <= 1) return false; else return Prime(N,N-1); } public static boolean Prime(long X,long Y) { if (Y == 1) return true; else if (X % Y == 0) return false; else return Prime(X, Y-1); } } It works okay with finding, say the 100th prime number, but when I enter very large numbers such as 10001 it causes a stack overflow. Does anyone know of a way to fix this? Thanks for reading my problem!

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• Why is the SelectTemplate Method run 2 times in debug mode?

  - by msfanboy

  Hello, debuging this class the SelectTemplate Method is run 2 times, but why? The first time the item is always null. public class PersonDataTemplateSelector : DataTemplateSelector { public override DataTemplate SelectTemplate(object item,DependencyObject container) { if (item is Person) { Person person = item as Person; Window window = Application.Current.MainWindow; if (System.ComponentModel.DesignerProperties.GetIsInDesignMode( window)) return null; if (person.Gender == "male") return window.FindResource("boysViewTemplate") as DataTemplate; else return window.FindResource("girlsViewTemplate") as DataTemplate; } return null; } }

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• Is a switch statement the fastest way to implement operator interpretation in Java

  - by Mordan

  Is a switch statement the fastest way to implement operator interpretation in Java public boolean accept(final int op, int x, int val) { switch (op) { case OP_EQUAL: return x == val; case OP_BIGGER: return x > val; case OP_SMALLER: return x < val; default: return true; } } In this simple example, obviously yes. Now imagine you have 1000 operators. would it still be faster than a class hierarchy? Is there a threshold when a class hierarchy becomes more efficient in speed than a switch statement? (in memory obviously not) abstract class Op { abstract public boolean accept(int x, int val); } And then one class per operator.

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• c# reading integer fields from database, returning empty string when reading integer type field

  - by arnoldino

  what is wrong with this code? field="id"; table="MInvMonth"; condition="machine_id=37"; public static String getConditionedField(String field, String table, String condition) try { if (cmd == null) getConnection(); cmd.CommandText = "Select " + field + " from " + table + " where " + condition; SQLiteDataReader reader = cmd.ExecuteReader(); if (reader.HasRows==true) { reader.Read(); string s = reader[0].ToString(); // return first element reader.Close(); return s; } reader.Close(); return null; } catch (Exception e) { MessageBox.Show("Caught exception: " + e.Message+"|"+cmd.CommandText); return null; } I checked the sql statement, it turns the right value. why can't I read it? the returnvalue is "".

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• How to Render Partial View into an Object

  - by DaveDev

  Hi all, I have the following code: public ActionResult SomeAction() { return new JsonpResult { Data = new { Widget = "some partial html for the widget" } }; } I'd like to modify it so that I could have public ActionResult SomeAction() { // will render HTML that I can pass to the JSONP result to return. var partial = RenderPartial(viewModel); return new JsonpResult { Data = new { Widget = partial } }; } is this possible? Could somebody explain how?

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• how to bind to the results of a query in WPF

  - by randyc

  I have a query that hits a service and returns the results back to me as an indexed collection static void QueryActivities() { QueryClient qc = new QueryClient("BasicHttpBinding_IQuery"); QueryFilter filter = new QueryFilter(); filter.CallForService = false; var result = qc.GetFilteredActivityIndex(filter); result.Clone(); //inserted this just to test return in debug mode } WHen this is executed I get a return of 5 records ( actually five rows of data with multiple values per each row. id, type, date, address etc). I would like to bind this return to a gridview within a WPF application. Is there a way to refernce and bind to result variable or do I need to create a new collection and then add the return of result to the new collection? thank you

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• Mapping Absolute / Relative (Local) Paths to Absolute URLs

  - by Alix Axel

  I need a fast and reliable way to map an absolute or relative local path (say ./images/Mafalda.jpg) to it's corresponding absolute URL, so far I've managed to come up with this: function Path($path) { if (file_exists($path) === true) { return rtrim(str_replace('\\', '/', realpath($path)), '/') . (is_dir($path) ? '/' : ''); } return false; } function URL($path) { $path = Path($path); if ($path !== false) { return str_replace($_SERVER['DOCUMENT_ROOT'], getservbyport($_SERVER['SERVER_PORT'], 'tcp') . '://' . $_SERVER['HTTP_HOST'], $path); } return false; } URL('./images/Mafalda.jpg'); // http://domain.com/images/Mafalda.jpg Seems to be working as expected, but since this is a critical feature to my app I want to ask if anyone can spot any problem that I might have missed and optimizations are also welcome since I'm going to use this function several times per each request.

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• How to create a variadic (with variable length argument list) function wrapper in JavaScript

  - by U-D13

  The intention is to build a wrapper to provide a consistent method of calling native functions with variable arity on various script hosts - so that the script could be executed in a browser as well as in the Windows Script Host or other script engines. I am aware of 3 methods of which each one has its own drawbacks. eval() method: function wrapper () { var str = ''; for (var i=0; i<arguments.lenght; i++) str += (str ?', ':'') + ',arguments['+i+']'; return eval('[native_function] ('+str+')'); } switch() method: function wrapper () { switch (arguments.lenght) { case 0: return [native_function] (arguments[0]); break; case 1: return [native_function] (arguments[0], arguments[1]); break; ... case n: return [native_function] (arguments[0], arguments[1], ... arguments[n]); } } apply() method: function wrapper () { return [native_function].apply([native_function_namespace], arguments); } What's wrong with them you ask? Well, shall we delve into all the reasons why eval() is evil? And also all the string concatenation... Not a solution to be labeled "elegant". One can never know the maximum n and thus how many cases to prepare. This also would strech the script to immense proportions and sin against the holy DRY principle. The script could get executed on older (pre- JavaScript 1.3 / ECMA-262-3) engines that don't support the apply() method. Now the question part: is there any another solution out there?

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