Access instance of a class

[Pavel_47]

Hello,

In my project there is a lot of different classes, created in different .py files.
To implement some feature I need to dynamically change a property of an instance of some class.
To test how to proceed I've tried to reproduced the case in significantly simplified case.

Here is 2 files:
class_instances_test_v0.py:

import weakref

class MyClass:

    _instances = set()

    def __init__(self, name):
        self.name = name
        self._instances.add(weakref.ref(self))

    @classmethod
    def getinstances(cls):
        dead = set()
        for ref in cls._instances:
            obj = ref()
            if obj is not None:
                yield obj
            else:
                dead.add(ref)
        cls._instances -= dead

a = MyClass("a")
b = MyClass("b")
c = MyClass("c")

class_instances_test_v0_test.py:

import class_instances_test_v0.MyClass
for obj in MyClass.getinstances():
    print(obj.name)

Here is error message:


Any comments.
Thanks.