All functions are also descriptors, so you can bind them by calling their __get__ method: bound_handler = handler.__get__(self, MyWidget) Here’s R. Hettinger’s excellent guide to descriptors. As a self-contained example pulled from Keith’s comment: def bind(instance, func, as_name=None): “”” Bind the function *func* to *instance*, with either provided name *as_name* or the existing name of … Read more
There seems to be an awful lot of confusion in the answers here. The Java language requires that every method in an interface is implemented by every implementation of that interface. Period. There are no exceptions to this rule. To say “Collections are an exception” suggests a very fuzzy understanding of what’s really going on … Read more
The comments referring to blocks and Procs are correct in that they are more usual in Ruby. But you can pass a method if you want. You call method to get the method and .call to call it: def weightedknn( data, vec1, k = 5, weightf = method(:gaussian) ) … weight = weightf.call( dist ) … Read more
Static methods cannot be overridden but they can be hidden. The ts() method of B is not overriding(not subject to polymorphism) the ts() of A but it will hide it. If you call ts() in B (NOT A.ts() or B.ts() … just ts()), the one of B will be called and not A. Since this … Read more
OK, first of all, you don’t have to get a reference to the module into a different name; you already have a reference (from the import) and you can just use it. If you want a different name just use import swineflu as f. Second, you are getting a reference to the class rather than … Read more
This quote from 8.4.3.2 may help: A method that is declared static is called a class method. A method that is not declared static is called an instance method […]. Class methods: associated with a class. Instance methods: associated with an instance. Java just wants you to “think object-oriented”. Also, static methods have access to … Read more
Disclosure: Harmony is a library that was written and is maintained by me, the author of this post. Harmony 2 is an open source library (MIT license) designed to replace, decorate or modify existing C# methods of any kind during runtime. It main focus is games and plugins written in Mono or .NET. It takes … Read more
A callable is anything that can be called. The built-in callable (PyCallable_Check in objects.c) checks if the argument is either: an instance of a class with a __call__ method or is of a type that has a non null tp_call (c struct) member which indicates callability otherwise (such as in functions, methods etc.) The method … Read more
Maybe a bit of example code will help: Notice the difference in the call signatures of foo, class_foo and static_foo: class A(object): def foo(self, x): print(f”executing foo({self}, {x})”) @classmethod def class_foo(cls, x): print(f”executing class_foo({cls}, {x})”) @staticmethod def static_foo(x): print(f”executing static_foo({x})”) a = A() Below is the usual way an object instance calls a method. The … Read more
Every object has a __dict__ variable containing all the variables and its values in it. Try this >>> hi_obj = hi() >>> hi_obj.__dict__.keys() Output dict_keys([‘ii’, ‘kk’])