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Subclassing a Java Builder class
...stead of extends, or (c) throw everything away. I now have a weird compile error where leafBuilder.leaf().leaf() and leafBuilder.mid().leaf() is OK, but leafBuilder.leaf().mid().leaf() fails...
– Ken Y-N
Jun 19 '13 at 4:01
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Django: How to completely uninstall a Django app?
What is the procedure for completely uninstalling a Django app, complete with database removal?
5 Answers
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Get Slightly Lighter and Darker Color from UIColor
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I got an error: -getHue:saturation:brightness:alpha: not valid for the NSColor NSCalibratedWhiteColorSpace 0 1; need to first convert colorspace.
– Besi
Jan 29 '16 at 18:09
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How do I “un-revert” a reverted Git commit?
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Please note this will remove all changes in working tree and index. Use git stash to save any changes you don't wan't to lose.
– zpon
Aug 30 '16 at 5:37
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Difference between static STATIC_URL and STATIC_ROOT on Django
...o static files to be found.
It would be thoughtful if Django spit out an error message stating you can't use a http(s):// with DEBUG = True
I had to change STATIC_URL to be '/static/'
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namedtuple and default values for optional keyword arguments
...lds)
>>> Node()
Node(val=None, left=None, right=None)
Order
In all versions of Python, if you set fewer default values than exist in the namedtuple, the defaults are applied to the rightmost parameters. This allows you to keep some arguments as required arguments.
>>> Node.__ne...
reference assignment is atomic so why is Interlocked.Exchange(ref Object, Object) needed?
In my multithreaded asmx web service I had a class field _allData of my own type SystemData which consists of few List<T> and Dictionary<T> marked as volatile . The system data ( _allData ) is refreshed once in a while and I do it by creating another object called newData and fill...
403 Forbidden vs 401 Unauthorized HTTP responses
...s a problem with 401 Unauthorized, the HTTP status code for authentication errors. And that’s just it: it’s for authentication, not authorization.
Receiving a 401 response is the server telling you, “you aren’t
authenticated–either not authenticated at all or authenticated
incorrectl...
variable === undefined vs. typeof variable === “undefined”
...undefined", whereas the identity check foo === undefined would trigger the error "foo is not defined".
For local variables (which you know are declared somewhere), no such error would occur, hence the identity check.
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SQL DROP TABLE foreign key constraint
...not drop object 'a' because it is referenced by a FOREIGN KEY constraint." error.
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