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properties - in python, is it a bad practice to use a property which doesn't return an instance variable?

Ok, let's say that I want to create a Vector2d in python to represent two-dimensional vectors. Now, I want to have a property to get the magnitude of the vector, so I code the next class:

class Vector2d:
    def __init__(self, x, y):
        self._x = x
        self._y = y

    @property
    def magnitude(self):
        return (self._x**2 + self._y**2)**(1/2)

I know I could use normal methods to do things like this, but I think that this way is more simple to use my class, so the question is, is it considered a bad practice?

question from:https://stackoverflow.com/questions/65878097/in-python-is-it-a-bad-practice-to-use-a-property-which-doesnt-return-an-instan

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