One rule-of-thumb: ask yourself “Does it make sense to call this method, even if no object has been constructed yet?” If so, it should definitely be static. So in a class Car you might have a method: …which would be static, because one might want to know what 35mpg converts to, even if nobody has ever built … Read more
Though classmethod and staticmethod are quite similar, there’s a slight difference in usage for both entities: classmethod must have a reference to a class object as the first parameter, whereas staticmethod can have no parameters at all. Example Explanation Let’s assume an example of a class, dealing with date information (this will be our boilerplate): This class obviously could be used to store … Read more
Though classmethod and staticmethod are quite similar, there’s a slight difference in usage for both entities: classmethod must have a reference to a class object as the first parameter, whereas staticmethod can have no parameters at all. Example Explanation Let’s assume an example of a class, dealing with date information (this will be our boilerplate): This class obviously could be used to store … Read more
The basic paradigm in Java is that you write classes, and that those classes are instantiated. Instantiated objects (an instance of a class) have attributes associated with them (member variables) that affect their behavior; when the instance has its method executed it will refer to these variables. However, all objects of a particular type might … Read more
The whole code is: why the following snippet: cause the following error: No enclosing instance of type ThreadLocalTest is accessible. Must qualify the allocation with an enclosing instance of type ThreadLocalTest (e.g. x.new A() where x is an instance of ThreadLocalTest). The core problem is that: i want to initialize the inner class in the … Read more
Yep, using the staticmethod decorator Note that some code might use the old method of defining a static method, using staticmethod as a function rather than a decorator. This should only be used if you have to support ancient versions of Python (2.2 and 2.3) This is entirely identical to the first example (using @staticmethod), just not using the nice … Read more