How to refer to the class from within it (like a recursive function)

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If I understand your question correctly, you should be able to reference class A within class A by putting the type annotation in quotes. This is called forward reference.

class A:
  # do something
  def some_func(self, a: 'A')
  # ...

See ref below

  1. https://github.com/python/mypy/issues/3661
  2. https://www.youtube.com/watch?v=AJsrxBkV3kc

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