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Calculate difference in keys contained in two Python dictionaries
...lf.set_past = set(current_dict.keys()), set(past_dict.keys())
self.intersect = self.set_current.intersection(self.set_past)
def added(self):
return self.set_current - self.intersect
def removed(self):
return self.set_past - self.intersect
def changed(self):
...
Python function global variables?
...declared locally even if they have the same value. This applies to tuples, ints... If it's an instance of a list for example and you do x.append("..."), it's the global variable x that is changed, because the local one references the global one.
– jadkik94
May ...
How to: Define theme (style) item for custom widget
...public CustomImageButton( Context context, AttributeSet attrs,
int defStyle ) {
super( context, attrs, defStyle );
final TypedArray array = context.obtainStyledAttributes( attrs,
R.styleable.CustomImageButton, defStyle,
R.style.Widget_ImageButton_...
What to do on TransactionTooLargeException
...ransaction buffer.
This also can occur, when you pass lot of data through intent extras
When you get this exception in your application, please analyze your code.
Are you exchanging lot of data between your services and application?
Using intents to share huge data, (for example, the user sele...
Operation on every pair of element in a list
...4
. . . 3,4
. . . .
All three of these functions were introduced in Python 2.6.
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What is the “volatile” keyword used for?
...
Consider this example:
int i = 5;
System.out.println(i);
The compiler may optimize this to just print 5, like this:
System.out.println(5);
However, if there is another thread which can change i, this is the wrong behaviour. If another thread c...
Difference between Arrays.asList(array) and new ArrayList(Arrays.asList(array))
...t(ia)
It takes an array ia and creates a wrapper that implements List<Integer>, which makes the original array available as a list. Nothing is copied and all, only a single wrapper object is created. Operations on the list wrapper are propagated to the original array. This means that if you ...
If table exists drop table then create it, if it does not exist just create it
...it with an old one (table contents are lost):
CREATE TABLE `bla__new` (id int); /* if not ok: terminate, report error */
RENAME TABLE `bla__new` to `bla`; /* if ok: terminate, report success */
RENAME TABLE `bla` to `bla__old`, `bla__new` to `bla`;
DROP TABLE IF EXISTS `bla__old`;
You should che...
Variable is accessed within inner class. Needs to be declared final
...
@ignis I'm getting a NullPointerException error on addSiteButton.setOnClickListener(new View.OnClickListener() { do you have any idea why that would be coming up?
– PhDeOliveira
Jan 21 '13 at 16:52
...
Anonymous recursive PHP functions
...) {
if( $n == 1 ) return 1;
return $factorial( $n - 1 ) * $n;
};
print $factorial( 5 );
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