Recursive class typing in python

Question

This question already has an answer here: question from:https://stackoverflow.com/questions/65909225/recursive-class-typing-in-python

Answer 1

Use the name of the recursive type in its declaration. For example:

class Heh:
  child_hehs: list['Heh']

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If you can use python 3.7.0b1 and above you can use Postponed Evaluation of Annotations.

from __future__ import annotations 
class Heh:     
    child_hehs: list[Heh]

This feature is expected to become part of the language in python 3.10 (in other words, without __future__ import).