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  • Instantiate a model when the kind of model needed is represented as a string argument

    - by indiehacker
    My input data is a string representing the kind of datastore model I want to make. In python, I am using the eval() function to instantiate the model (below code), but this seems overly complex so I was wondering if there is a simpler way people normally do this? >>>model_kind="TextPixels" >>>key_name_eval="key_name" >>>key_name="key_name" >>>kwargs {'lat': [0, 1, 2, 3], 'stringText': 'boris,ted', 'lon': [0, 1, 2, 8], 'zooms': [0, 10]} >>>obj=eval( model_type + '(key_name='+tester+ ',**kwargs )' ) >>>obj <datamodel.TextPixels object at 0xed8808c>

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  • Covariance and contravariance real world example

    - by Sir Psycho
    I'm having a little trouble understaing how I would use covariance and contravariance in the real world. So far, the only example's I've seen have been the same old array example. object[] objectArray = new string[] { "string 1", "string 2" }; It would be nice to see an example that would allow me to use it during my development if I could see it being used elsewhere. Can anyone point me to some useful resources?

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  • Python - how to check if weak reference is still available

    - by Alex
    Hi all, I am passing some weakrefs from Python into C++ class, but C++ destructors are actively trying to access the ref when the real object is already dead, obviously it crashes... Is there any Python C/API approach to find out if Python reference is still alive or any other known workaround for this ? Thanks

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  • simple question of pushViewController

    - by user217572
    messagecontroller is nothing but object of initialize nib file. [self.navigationController pushViewController:messageController animated:YES]; this statement executes in normal condition this statement also works on state maintainace testing , this line executes properly but not open new view ,why?

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  • WP7 PanoramaItem with Icon/Button next to Header

    - by Ramon Bosch
    Windows Phone 7's People hub has an "all" panorama item with "search" and a "new" buttons right next to the header/title. I can't seem to accomplish this with PanoramaItem in Visual Studio using the standard Panorama control. I don't know enough Silverlight/WPF either to be able to position something manually and control transitions/movement correctly. How can I set a button (or any object, for that matter) to go alongside the header of a wp7 PanoramaItem? Thanks!

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  • Simple PHP ORM

    - by booch
    I'm looking for an ORM (Object-Relational Mapper) for PHP. I want something simple that I can get started with quickly. I'm used to ActiveRecord in Rails, but I don't need a full framework. My partner knows PHP, but is not really a programmer, and learning a framework would take more time than the project. Thanks, Craig

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  • Having an issue while trying to implement In-App Purchase

    - by Raymond
    This is my first time to implement In-App purchase and I am using the tutorial located here: Ray Wenderlich Now I am sure this is something simple, but I am having issues figuring out, so I figured I would ask all of the gurus out here. The compiler is saying that _products is Use of undeclared identifier - (void)productPurchased:(NSNotification *)notification { NSString * productIdentifier = notification.object; [_products enumerateObjectsUsingBlock:^(SKProduct * product, NSUInteger idx, BOOL *stop) { if ([product.productIdentifier isEqualToString:productIdentifier]) { *stop = YES; } }]; }

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  • Where to locate the unattend.xml schema

    - by Adam Driscoll
    I'm in need of a way to modify an unattend.xml file programmatically. It would be great if I could just serialize to and from an object. But to do so I would need to get a hold of the schema so that I can run it through XSD. The referenced link provides all the possible settings but it would be nice to have it in XSD format. Any ideas?

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  • Decide which caching startegy to use ?

    - by hib
    Hi all, I want to cache my loaded data so that I can reduce my application start time . I know several strategies to store application data i.e. core data, nsuserdefaults , archiving . Now my scenario is that suppose that I have array of maximum 10 objects each object having 5 fields . So I can not decide which strategy to store this array an later retrieving the same . Thanks .

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  • in c# are methods private by default?

    - by Eli Perpinyal
    If I have a method that does not specify its Accessibility Level will it be Private by default? void Item_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e) { throw new NotImplementedException(); } Is the above method private?

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  • What's the Microsoft Ajax equivalent to jquery.ajaxSetup() or .ajaxError()?

    - by Seth Petry-Johnson
    I have an ASP.NET MVC site that uses both Microsoft Ajax [Ajax.BeginForm()] and jQuery to make asynchronous requests. I want to configure both frameworks such that a generic error handler is automatically attached if the developer does not explicitly specify a failure callback. In jQuery I can accomplish this with either .ajaxSetup() or .ajaxError(). What is the equivalent in the Microsoft Ajax client library? I'm fairly sure it's something in the Sys object but I can't find it...

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  • foo and _foo - about variables inside a class

    - by kame
    class ClassName(object): """ """ def __init__(self, foo, bar): """ """ self.foo = foo # read-write property self.bar = bar # simple attribute def _set_foo(self, value): self._foo = value def _get_foo(self): return self._foo foo = property(_get_foo, _set_foo) a = ClassName(1,2) #a._set_foo(3) print a._get_foo() When I print a._get_foo() the function _get_foo prints the variable self._foo . But where does it come from? self._foo and self.foo are different, aren't they?

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  • Hibernate Lazy Loading Proxy Incompatable w/ Other Frameworks

    - by bowsie
    I've come across several instances where frameworks that take POJOs to do some work crap-out with proxied hibernate beans. For example if I xml annotate a bean for framework X and pass it to framework X it doesn't recognise the bean because it is passed the proxied object - which has no annotations for framework X. Is there a common solution to this? I'd prefer not to define the bean as eager loaded, or turn of lazy-loading anywhere in the application. Thoughts? Thanks.

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  • Passing a filepath to a R function?

    - by Philipp
    Hi everybody, I tried to pass a filepath to a function in R, but I failed =/ I hope someone here can help me. >heat <- function(filepath) { chicks <- read.table(file=filepath, dec=",", header=TRUE, sep="\t") ... } When I call the function, nothing happens... >heat("/home/.../file.txt") ... and "chicks" is not found >chicks Error: Object 'chicks' not found What is the correct way to pass a path to a function? Best wishes from Germany, Phil

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  • Difference between abstract class and interface

    - by nectar
    A class implementing an interface has to implement all the methods of the interface, but if that class is implementing an abctract class is it necessary to implement all abstract methods? If not, can we create the object of that class which is implementing the Abstract class???

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  • RSA PKCS1 implementation in Python

    - by user307016
    I'm working on the RSA PKCS1 implementation in Python,here's the message block i got: m = [0,2,random paddings,0,message integers] I read the RFC2313,and get a equation seems for transforming the message block object into an big-edian integer. I just get confused about how to transform it in Python. Any help would be appreciated.

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  • How to cancel a touch sequence

    - by Alex
    I have an UIImage view that responds to touch events. I want to cancel the touch sequence if the touch goes outside of certain bounds. How can I do that? I know that I can inspect the coordinates of the touch object, what I don't know is how to cancel the sequence. I don't see any event in the API that allows for that.

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  • How do I set a property in python using its string name

    - by dave
    Hey, here's a dumb question: how can I set an object property given its name in a string. I have a dictionary being passed to me and I wish to transfer its values into namesake properties using code like this: for entry in src_dict: if entry.startswith('can_'): tgt_obj[entry] = src_dict_profile[entry] I'm still a bit of a noob with Python so would appreciate some help. - dave.

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  • How to disable ToolStripMenuItem in Context menu Dynamically?

    - by NIGHIL DAS
    In my windows application i have a context menu with a grid the problem is that I want to disable the ToolStripMenuItem in context menu according to the user previlages.How can i do that. i have done like this but it is not working private void contextMenuStrip_Machine_Opening(object sender, CancelEventArgs e) { toolStripAuthorize.Enabled = INFOpermission.accessAuthorize; } but it is not working

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  • [Silverlight] MessageBox Black Page

    - by nCdy
    I do Silverlight MVC project on VWDEE2010 when I do private void button1_Click(object sender, RoutedEventArgs e) { MessageBox.Show("I am a button"); } Message shows on BlackScreen on background and only when I click OK it returnts me to my page. Why black page and what ways to avoid ? Thank you.

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  • WPF DataContext syntax - Convert from C# to VB

    - by hawbsl
    Currently working through a Teach Yourself WPF tutorial. Usually I can mentally convert from C# to VB without any problem but this C# syntax is unfamiliar. How is it written in VB? Private void Button_Click(object sender, RoutedEventArgs e) { ((Person)DataContext).FirstName = "blah blah" } My usual fave online converters are choking on this ... perhaps because they don't do WPF?

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  • Horizontal scrolling in a wx.RichTextCtrl

    - by Sam
    I have a RichTextCtrl created as follows: self.userlist = wx.richtext.RichTextCtrl(self, style=wx.TE_MULTILINE|wx.TE_READONLY|wx.HSCROLL) It all works fine, except for the wx.HSCROLL style. If I change the RichTextCtrl to a regular TextCtrl, it correctly horizontal scrolls on long lines, rather than wrapping, but on the RichTextCtrl it wraps regardless. Is there an easy way to make it scroll horizontally? (I do, unfortunately, need the RichTextCtrl's featureset for this object.)

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