Noticed this code, where `file` is neither a Python 3 built-in, nor imported: https://github.com/nipy/nibabel/blob/1ee4983a55fae5da47fbf197fb97d17157a22534/doc/source/devel/register_me.py#L41 This looks like a Python 2 left-over: https://python.readthedocs.io/en/v2.7.2/library/functions.html#file https://portingguide.readthedocs.io/en/latest/builtins.html#removed-file Has [`doc/source/devel/register_me.py`](https://github.com/nipy/nibabel/blame/master/doc/source/devel/register_me.py) ever been run recently? Is it still useful?