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In Django, how does one filter a QuerySet with dynamic field lookups?
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A simplified example:
In a Django survey app, I wanted an HTML select list showing registered users. But because we have 5000 registered users, I needed a way to filter that list based on query criteria (such as just people who completed a certain workshop). In orde...
Regular expressions in an Objective-C Cocoa application
... there's no built-in way to do regular expressions in an Objective-C Cocoa application.
10 Answers
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How to Save Console.WriteLine Output to Text File
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Is it possible only using app.config, not programmatically, section system.diagnostics ? Any sample?
– Kiquenet
Sep 5 '14 at 7:34
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Xcode iOS project only shows “My Mac 64-bit” but not simulator or device
This just started happening that my iOS project is only showing "My Mac 64-bit" rather than the Simulator or my iPhone to build to. I have no idea why this is happening. I do not think that I have changed anything.
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How can I check the system version of Android?
..., then we can not get android.os.Build.VERSION_CODES.GINGERBREAD, will the app crash?
– HongchaoZhang
Oct 24 '16 at 2:56
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Easiest way to rename a model using Django/South?
... pretty straightforward. Run the command:
./manage.py schemamigration yourapp rename_foo_to_bar --empty
(Update 2: try --auto instead of --empty to avoid the warning below. Thanks to @KFB for the tip.)
If you're using an older version of south, you'll need startmigration instead of schemamigrat...
Is there an easy way to check the .NET Framework version?
...ys compile your code on newer versions of
// the framework to ensure your app works the same.
private static string CheckFor45DotVersion(int releaseKey)
{
if (releaseKey >= 461808) {
return "4.7.2 or later";
}
if (releaseKey >= 461308) {
return "4.7.1 or later";
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What are Java command line options to set to allow JVM to be remotely debugged?
...-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005 <YourAppName>
For java 1.4:
java -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5005 <YourAppName>
For java 1.3:
java -Xnoagent -Djava.compiler=NONE -Xdebug -Xrunjdwp:transport=dt_socket,server=y,...
Getting rid of \n when using .readlines() [duplicate]
...ommend the use of python's CSV module. I would not be giving tips that are applicable to a purely text file with CR-separated lines of data. So tab-separated values is a circumstance where that would be bad and if stated that way, this answer would never be my recommendation.
–...
How do I pass a class as a parameter in Java?
... } catch (InstantiationException ex) {
Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ex);
}
}
Here are some good examples on ...