context manager flow chart parser

from contextlib import ExitStack
from dataclasses import dataclass
import json


@dataclass
class Node:
    n_id: int
    n_type: str
    n_text: str
    points_to: int | list[int] | None

    def __enter__(self, *args, **kwargs):
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        return True if self.n_type == 'end' else False


chart = []
with open('resources/nodes.json', 'r') as file:
    data = file.read()
    nodes = json.loads(data)['nodes']
    with ExitStack() as stack:
        chart = [stack.enter_context(Node(*tuple(n.values()))) for n in nodes]

print(chart)

# resources/nodes.json
"""
{
  "nodes": [
    {
      "id": 1 ,
      "type": "start" ,
      "text": "" ,
      "points_to": 2
    } ,
    {
      "id": 2 ,
      "type": "input" ,
      "text": "get input" ,
      "points_to": 3
    } ,
    {
      "id": 3 ,
      "type": "process" ,
      "text": "do work" ,
      "points_to": 4
    } ,
    {
      "id": 4 ,
      "type": "question" ,
      "text": "yes/no" ,
      "points_to": [
        5 ,
        6
      ]
    } ,
    {
      "id": 5 ,
      "type": "process" ,
      "text": "do more work" ,
      "points_to": 7
    } ,
    {
      "id": 6 ,
      "type": "input" ,
      "text": "get more input" ,
      "points_to": 7
    } ,
    {
      "id": 7 ,
      "type": "question" ,
      "text": "yes/no" ,
      "points_to": [
        3 ,
        8
      ]
    } ,
    {
      "id": 8 ,
      "type": "input" ,
      "text": "get more input" ,
      "points_to": 9
    } ,
    {
      "id": 9 ,
      "type": "question" ,
      "text": "yes/no" ,
      "points_to": [
        10 ,
        11
      ]
    } ,
    {
      "id": 10 ,
      "type": "process" ,
      "text": "do more work" ,
      "points_to": 12
    } ,
    {
      "id": 11 ,
      "type": "end" ,
      "text": "finished 1" ,
      "points_to": null
    } ,
    {
      "id": 12 ,
      "type": "end" ,
      "text": "finished 2" ,
      "points_to": null
    }
  ]
}

"""