Mutable defaults in dataclasses will cause an error in Python 3.11. HelixGroup has a Position3D default. Position3D appears to be intended to be immutable, and is never used mutably in the code, but does not have frozen=True set for the dataclass options. This sets it, and causes tests to pass with Python 3.11.0b4.
Alternatively, Position3D could be left as is, and the HelixGroup position could be made to be position: Position3D = field(default_factory=lambda: Position3D(x=0,y=0,z=0)), but this seems less efficient.
Mutable defaults in dataclasses will cause an error in Python 3.11. HelixGroup has a Position3D default. Position3D appears to be intended to be immutable, and is never used mutably in the code, but does not have
frozen=Trueset for the dataclass options. This sets it, and causes tests to pass with Python 3.11.0b4.Alternatively, Position3D could be left as is, and the HelixGroup position could be made to be
position: Position3D = field(default_factory=lambda: Position3D(x=0,y=0,z=0)), but this seems less efficient.