Acess variables from class

[samuelbachorik]

Hi I have class like this and staticmethod inside. I want to ask you how to acess self. variables from class ? For example - self.paths

class ImagesLoader: def __init__(self, paths): self.paths = paths @staticmethod def loop(): HERE I WANT ACCESS self.paths

[deanhystad]

self is an instance. You have no instance for a static method or a class method.

A static or class method can certainly interact with instances of it's class (or any class for that matter). For example class A has a class method that interacts with instances of the class.

class A(): _instances = [] @classmethod def forall(cls, method, *args): func = getattr(cls, method, None) if func is not None: for x in cls._instances: func(x, *args) def __init__(self, value=0): self.value = value self._instances.append(self) def print(self, *args): print(self, self.value, *args) for i in range(10): A(i) A.forall('print', 'Hello')

forall() works with instances, but it has no instance (no self). It needs to get instances using some other means. In this example instances are added to a list that is a class attribute. For a static method you would need something else. Maybe something as simple ass passing an instance as an argument.

[Yoriz]

If you want to use self in a method simply don't make it a static method

class ImagesLoader: def __init__(self, paths): self.paths = paths def loop(self): self.paths

[deanhystad]

A static method is really just a function that happens to be defined within the scope of a class. In the example below the only difference between print_a() defined in A() and the print_a() function is scope, essentially the namespace where the function is defined.

class A(): _instances = [] def __init__(self, value=0): self.value = value @staticmethod def print_a(instance): print(instance.value) def print_a(instance): print(instance.value) a = A('Hello') A.print_a(a) print_a(a)

The static method has no more knowledge or access than the external function. Making the function a static method is mostly a matter of packaging. "Here is a useful function that you can use with this class. I am including it here so it is easy to find."