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Python memoising/deferred lookup property decorator
...or but only upon first read. These attributes do not change over the lifetime of the instance, but they're a real bottleneck to calculate that first time and only really accessed for special cases. Hence they can also be cached after they've been retrieved from the database (this therefore fits the ...
In mongoDb, how do you remove an array element by its index?
In the following example, assume the document is in the db.people collection.
8 Answers
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How to call a Parent Class's method from Child Class in Python?
...reating a simple object hierarchy in Python, I'd like to be able to invoke methods of the parent class from a derived class. In Perl and Java, there is a keyword for this ( super ). In Perl, I might do this:
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How can I get color-int from color resource?
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You can use:
getResources().getColor(R.color.idname);
Check here on how to define custom colors:
http://sree.cc/google/android/defining-custom-colors-using-xml-in-android
EDIT(1):
Since getColor(int id) is deprecated now, this must be used :
ContextCompat.getColor(cont...
How can I remove the first line of a text file using bash/sed script?
...give you the last 5 lines of the input. The + sign kind of inverts the argument and make tail print anything but the first x-1 lines. tail -n +1 would print the whole file, tail -n +2 everything but the first line, etc.
GNU tail is much faster than sed. tail is also available on BSD and the -n +2 f...
Margin-Top push outer div down
I have a header div as the first element in my wrapper div, but when I add a top margin to a h1 inside the header div it pushes the entire header div down. I realize this happens whenever I apply a top margin to the first visible element on a page.
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How to set data attributes in HTML elements
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Demo
Reference
From the reference:
jQuery itself uses the .data() method to save information under the names 'events' and 'handle', and also reserves any data name starting with an underscore ('_') for internal use.
It should be noted that jQuery's data() doesn't change the data attribute...
How to convert a LocalDate to an Instant?
I work with the new DateTime API of Java 8.
2 Answers
2
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How does the Comma Operator work
...would be equal to b.
The comma operator has a lower precedence than assignment.
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Explanation of BASE terminology
...ter system cannot guarantee all of the following three properties at the same time:
Consistency
Availability
Partition tolerance
A BASE system gives up on consistency.
Basically available indicates that the system does guarantee availability, in terms of the CAP theorem.
Soft state indicates t...