class Quaternion:

X: float

Y: float

Z: float

W: float

def __init__(self, x: float = 0.0, y: float = 0.0, z: float = 0.0, w: float = 0.0):

self._data = [0.0] * 4

self.X = x

self.Y = y

self.Z = z

self.W = w

@property

def X(self) -> float:

return self._data[0]

@X.setter

def X(self, value: float):

self._data[0] = value

@property

def Y(self) -> float:

return self._data[1]

@Y.setter

def Y(self, value: float):

self._data[1] = value

@property

def Z(self) -> float:

return self._data[2]

@Z.setter

def Z(self, value: float):

self._data[2] = value

@property

def W(self) -> float:

return self._data[3]

@W.setter

def W(self, value: float):

self._data[3] = value

def __getitem__(self, value):

return self._data[value]

def __setitem__(self, index, value):

self._data[index] = value