Python marshmallow tree structure with polymorphism

Question

I have the following code for a tree structure:

class Node:
    def __init__(self, node_id: str):
        self.node_id = node_id
        self.children = []

             


        

Answer 1

I found about marshmallow-oneofschema

Although not integrated to the core, I think marshmallow-oneofschema is the recommended way to do polymorphism.

this leads to a circular import

You may pass the name as string to solve the circular import issue.

    children = fields.Nested('SomeNodeSchema', many=True)