MNT: Assorted refurb suggestions

[DimitriPapadopoulos]

No description provided.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (1ee4983) 92.24% compared to head (c1c38c1) 92.24%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1270      +/-   ##
==========================================
- Coverage   92.24%   92.24%   -0.01%     
==========================================
  Files          99       99              
  Lines       12455    12452       -3     
  Branches     2561     2560       -1     
==========================================
- Hits        11489    11486       -3     
  Misses        643      643              
  Partials      323      323              

Files	Coverage Δ
nibabel/cifti2/cifti2.py	96.87% <100.00%> (ø)
nibabel/cifti2/parse_cifti2.py	83.90% <100.00%> (ø)
nibabel/cmdline/ls.py	77.21% <ø> (ø)
nibabel/freesurfer/io.py	94.24% <100.00%> (ø)
nibabel/gifti/gifti.py	93.26% <100.00%> (ø)
nibabel/gifti/parse_gifti_fast.py	85.53% <100.00%> (ø)
nibabel/nifti1.py	92.76% <100.00%> (-0.03%)	⬇️
nibabel/streamlines/array_sequence.py	97.90% <100.00%> (ø)
nibabel/viewers.py	95.49% <100.00%> (ø)
nibabel/cmdline/parrec2nii.py	90.41% <0.00%> (ø)
... and 1 more

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[effigies]

Thanks!