Python __call__ special method practical example

Question

I know that __call__ method in a class is triggered when the instance of a class is called. However, I have no idea when I can use this special method, because

Answer 1

This is too late but I'm giving an example. Imagine you have a Vector class and a Point class. Both take x, y as positional args. Let's imagine you want to create a function that moves the point to be put on the vector.

4 Solutions

• put_point_on_vec(point, vec)

• Make it a method on the vector class. e.g my_vec.put_point(point)

• Make it a method on the Point class. my_point.put_on_vec(vec)
• Vector implements __call__, So you can use it like my_vec_instance(point)

This is actually part of some examples I'm working on for a guide for dunder methods explained with Maths that I'm gonna release sooner or later.

I left the logic of moving the point itself because this is not what this question is about