Comment by divbzero

The @dataclass decorator [1] as proposed in PEP 557 [2] has also been available since Python 3.7 was released in 2018.

Using @dataclass the example from OP would look like:

  from dataclasses import dataclass
  
  @dataclass
  class Point3D:
      x: float
      y: float
      z: float

[1]: https://docs.python.org/3/library/dataclasses.html

[2]: https://www.python.org/dev/peps/pep-0557/