How do I have to do in Python for calling an static method from another static method of the same class? class Test(): @staticmethod def static_method_to_call(): pass @staticmethod def another_static_method(): Test.static_method_to_call() @classmethod def another_class_method(cls): cls.static_method_to_call()
update for python version >= 3.10: staticmethod functions can be called from within class scope just fine (for more info see: python issue tracker, or “what’s new”, or here) for python version <= 3.9 continue reading staticmethod objects apparently have a __func__ attribute storing the original raw function (makes sense that they had to). So … Read more
Replace the staticmethod with a classmethod. This will be passed the class when it is called, so you can get the class name from that. class Bar(object): @classmethod def bar(cls): # code print cls.__name__ class Foo(Bar): # code pass >>> Bar.bar() Bar >>> Foo.bar() Foo
With this code: class var items: [AnyObject] { return [AnyObject]() } you are not creating a stored property – instead it’s a computed property, and the worst part is that every time you access to it, a new instance of [AnyObject] is created, so whatever you add to it, it’s lost as soon as its … Read more
C# operators have to be static. Interfaces, by definition, apply to instances. There is no mechanism to require a type to implement static members. EDIT: Since C# 8.0, as you can see here, it is now possible to define local methods in interfaces and implement them within the interface itself, e.g. allowing to create method … Read more
Add the __iter__ to the metaclass instead of the class itself (assuming Python 2.x): class Foo(object): bar = “bar” baz = 1 class __metaclass__(type): def __iter__(self): for attr in dir(self): if not attr.startswith(“__”): yield attr For Python 3.x, use class MetaFoo(type): def __iter__(self): for attr in dir(self): if not attr.startswith(“__”): yield attr class Foo(metaclass=MetaFoo): bar … Read more
This is not how staticmethod is supposed to be used. staticmethod objects are descriptors that return the wrapped object, so they only work when accessed as classname.staticmethodname. Example class A(object): @staticmethod def f(): pass print A.f print A.__dict__[“f”] prints <function f at 0x8af45dc> <staticmethod object at 0x8aa6a94> Inside the scope of A, you would always … Read more
Because there isn’t an obvious syntax to call such an operator, which would mean we’d have to make up something. Consider the following variables: X x1; X x2; Now, let’s pretend for a moment that we’re using normal member functions instead of operators – let’s say I changed operator+ to plus in your example. Each … Read more
First create a final class with a public static method which does exactly the job you want: package com.example; import java.util.Collection; public final class Functions { private Functions() { // Hide constructor. } public static boolean contains(Collection<Object> collection, Object item) { return collection.contains(item); } } Then define it as a facelet-taglib in /WEB-INF/functions.taglib.xml: <?xml version=”1.0″ … Read more
Object-orientation is about three things: messaging, local retention and protection and hiding of state-process, and extreme late-binding of all things. Of those three, the most important one is messaging. Static methods violate at least messaging and late-binding. The idea of messaging means that in OO, computation is performed by networks of self-contained objects which send … Read more