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Elegant ways to support equivalence (“equality”) in Python classes
When writing custom classes it is often important to allow equivalence by means of the == and != operators. In Python, this is made possible by implementing the __eq__ and __ne__ special methods, respectively. The easiest way I've found to do this is the following method:
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Getting the class name of an instance?
How do I find out a name of class that created an instance of an object in Python if the function I am doing this from is the base class of which the class of the instance has been derived?
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How to elegantly ignore some return values of a MATLAB function?
Is it possible to get the 'nth' return value from a function without having to create dummy variables for all n-1 return values before it?
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How can I get a java.io.InputStream from a java.lang.String?
...want to use as an InputStream . In Java 1.0, you could use java.io.StringBufferInputStream , but that has been @Deprecrated (with good reason--you cannot specify the character set encoding):
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Why does one often see “null != variable” instead of “variable != null” in C#?
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It's a hold-over from C. In C, if you either use a bad compiler or don't have warnings turned up high enough, this will compile with no warning whatsoever (and is indeed legal code):
// Probably wrong
if (x = 5)
when you actually probably meant
if (x == 5)
You can work ...
Handling click events on a drawable within an EditText
... to extend any class. Let's say I have an EditText editComment with a drawableRight
editComment.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
final int DRAWABLE_LEFT = 0;
final int DRAWABLE_TOP = 1;
final in...
Difference between map and collect in Ruby?
...and got patchy / contradictory opinions - is there actually any difference between doing a map and doing a collect on an array in Ruby/Rails?
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Callback functions in C++
In C++, when and how do you use a callback function?
10 Answers
10
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How can I push a specific commit to a remote, and not previous commits?
I have made several commits on different files, but so far I would like to push to my remote repository only a specific commit.
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Why do we usually use || over |? What is the difference?
I'm just wondering why we usually use logical OR || between two booleans not bitwise OR | , though they are both working well.
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