Create Object of a Class based on another Objects Attributes in Python

Question

What would be the best practice to create a new object, which uses the attributes of an existing object of another class type in Python?

Let's say I have an object MvsObject of the class MvsClass and I want to create a new object of a different class that uses the attributes densePointClouds and sparsePointClouds and processes them with the methods of the class PointCloud.

Would the following approach be a "good practice" in Python?

class PointCloud:    

    def __init__(self, MvsObject):
        self.densePointClouds           = MvsObject.densePointClouds
        self.sparsePointClouds          = MvsObject.sparsePointClouds

Delgan · Accepted Answer · 2021-06-30 10:15:45Z

2

Your solution is good. You could also use @classmethod decorator in order to define two ways to build your class (in a "classical" way, or using another instance).

class PointCloud:    

    def __init__(self, dense_points_cloud, sparse_points_cloud):
        self.dense_points_cloud = dense_points_cloud
        self.sparse_points_cloud = sparse_points_cloud

    @classmethod
    def from_mvs_object(cls, mvs_object):
        return cls(mvs_object.dense_points_cloud, mvs_object.sparse_points_cloud)

You would instantiate it like this:

point = PointCloud.from_mvs_object(mvs_object)

Note also I renamed the attributes because using Python, it's preferred to use snake case to name your variables.

edited Jun 30, 2021 at 10:15

answered Jun 30, 2021 at 10:10

Delgan

20k11 gold badges101 silver badges162 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Miau Over a year ago

Thx for the answer. Do you know what the 'cls' actually does and what it is for?

Delgan Over a year ago

@Miau It represents the current class, which is PointCloud in your case.

Collectives™ on Stack Overflow

Create Object of a Class based on another Objects Attributes in Python

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related