`scipy.spatial.transform._rigid_transform:RigidTransform.setitem`

Signature

def __setitem__(self, indexer: int | slice | EllipsisType | None | ArrayLike, value: RigidTransform)

Set transform(s) at given index(es) in this object.

indexer : int or slice or array_like: Specifies which transform(s) to replace. A single indexer must be specified, i.e. as if indexing a 1 dimensional array or list.
value : `RigidTransform` instance: The transform(s) to set.

from scipy.spatial.transform import RigidTransform as Tf
t = [[0, 0, 0], [1, 0, 0], [2, 0, 0]]  # 3 translations
tf = Tf.from_translation(t)

✓

Set a single transform:

tf[0] = Tf.from_translation([9, 9, 9])
tf.translation

✓

array([[9., 9., 9.],
       [1., 0., 0.],
       [2., 0., 0.]])