ksubramz/nibabel-1 — comment on commit fa0db82497e5817294ba0d6e36f4099aa3846eb4
File: nibabel/freesurfer/mghformat.py line 260
By matthew-brett:

Interesting. Nice API, except, that the result doesn't behave like a real attribute, in the sense that it's a copy, and so modifying the return value won't modify the affine of the image:

http://nipy.sourceforge.net/devel/guidelines/properties.html

Just a guideline.