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What is :: (double colon) in Python when subscripting sequences?
...every third item of the sequence sliced.
Extended slices is what you want. New in Python 2.3
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What is a serialVersionUID and why should I use it?
...rate the serialVersionUID on the old class, and explicitly set that on the new class. (Depending on your changes you may need to also implement custom serialization by adding writeObject and readObject methods - see Serializable javadoc or aforementioned chapter 11.)
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What does android:layout_weight mean?
...t_width="0dp" together with layout_weight="1". Forgetting this causes many new users problems. (See this article for different results you can get by not setting the width to 0.) If your views are in a vertical LinearLayout then you would use layout_height="0dp", of course.
In the Button example ab...
Pretty printing XML in Python
...s out in the text node is actually different than what came in - there are new whitespaces on text nodes. This may cause you trouble if you are expecting EXACTLY what fed in to feed out.
– Todd Hopkinson
Jan 12 '12 at 18:03
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equals vs Arrays.equals in Java
...ments of the arrays.
This snippet elucidates the difference:
Object o1 = new Object();
Object o2 = new Object();
Object[] a1 = { o1, o2 };
Object[] a2 = { o1, o2 };
System.out.println(a1.equals(a2)); // prints false
System.out.println(Arrays.equals(a1, a2)); // prints true
See also Arrays.equals...
Setting focus on an HTML input box on page load
...l = function(e) {
var $elem = $('.new-login-left'),
docViewTop = $window.scrollTop(),
docViewBottom = docViewTop + $window.height(),
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PHP Sort a multidimensional array by element containing date
...can use the Spaceship operator:
usort($array, function($a, $b) {
return new DateTime($a['datetime']) <=> new DateTime($b['datetime']);
});
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notifyDataSetChanged example
...(), insert(), remove(), clear(), etc.)
Re-create the ArrayAdapter with the new List data. (Uses a lot of resources and garbage collection.)
Create your own class derived from BaseAdapter and ListAdapter that allows changing of the underlying List data structure.
Use the notifyDataSetChanged() every ...
Remove border radius from Select tag in bootstrap 3
...="0px" width="14px" height="12px" viewBox="0 0 14 12" enable-background="new 0 0 14 12" xml:space="preserve"> <polygon points="3.862,7.931 0,4.069 7.725,4.069 "/></svg> it saves same file space. It's also cacheable and easier to maintain. Copy this into a file and save as .svg and u...
Delete all local changesets and revert to tree
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When the simplest way (a new hg clone) isn't practical, I use hg strip:
% hg outgoing -l 1
% hg strip $rev # replace $rev with the revision number from outgoing
Repeat until hg outgoing stays quiet. Note that hg strip $rev obliterates $rev and all...