Which of the 4 ways to call super() in Python 3 to use?

Let’s use the following classes for demonstration: class A(object): def m(self): print(‘m’) class B(A): pass Unbound super object doesn’t dispatch attribute access to class, you have to use descriptor protocol: >>> super(B).m Traceback (most recent call last): File “<stdin>”, line 1, in <module> AttributeError: ‘super’ object has no attribute ‘m’ >>> super(B).__get__(B(), B) <super: <class … Read more

Dynamic method dispatching in C

As others have noted, it is certainly possible to implement this in C. Not only is it possible, it is a fairly common mechanism. The most commonly used example is probably the file descriptor interface in UNIX. A read() call on a file descriptor will dispatch to a read function specific to the device or … Read more

Methods With Same Name as Constructor – Why?

My guess is that it’s allowed because explicitly disallowing it would add another requirement to Java’s identifier naming rules for very little benefit. Unlike, say, C++, Java always requires that constructors are called with the new keyword, so there’s never any ambiguity about whether an identifier refers to a method or a constructor. I do … Read more

Why encapsulation is an important feature of OOP languages? [closed]

Encapsulation helps in isolating implementation details from the behavior exposed to clients of a class (other classes/functions that are using this class), and gives you more control over coupling in your code. Consider this example, similar to the one in Robert Martin’s book Clean Code: public class Car { //… public float GetFuelPercentage() { /* … Read more

Comparing Integer objects [duplicate]

For reference types, == checks whether the references are equal, i.e. whether they point to the same object. For primitive types, == checks whether the values are equal. java.lang.Integer is a reference type. int is a primitive type. Edit: If one operand is of primitive type, and the other of a reference type that unboxes … Read more