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  1. from typing import ClassVar
  2. from dataclasses import dataclass
  3.  
  4. @dataclass
  5. class Feld:
  6.     _id_to_instance: ClassVar[dict] = {}
  7.     id: str
  8.     value: str
  9.  
  10.     def __post_init__(self):
  11.         self._id_to_instance[self.id] = self
  12.  
  13.     @classmethod
  14.     def get_instance_by_id(cls, id):
  15.         return cls._id_to_instance[id]
  16.  
  17. for id, value in ('id1', 'value1'), ('id2', 'value2'):
  18.     Feld(id, value)
  19.  
  20. print(Feld.get_instance_by_id('id2'))
Success #stdin #stdout 0.04s 10760KB
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Feld(id='id2', value='value2')
https://ideone.com/KgQH5y
language:
Python 3 (python  3.9.5)
created:
196 days ago
visibility:
secret

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