STY: Apply ruff/Pyflakes rules (F)

[DimitriPapadopoulos]

Summary

Apply Pyflakes (F) rules, except:

• F401 (831 errors!)
• F403
• F811 (left for later)
• F821 (fixed some occurrences and left a few for later)
• F841 (fixed some occurrences and left a few for later)

[codecov]

Codecov Report

Attention: Patch coverage is 26.82927% with 30 lines in your changes missing coverage. Please review.

Project coverage is 39.46%. Comparing base (4d1352a) to head (70f42d4).

Files with missing lines	Patch %	Lines
nipype/interfaces/cmtk/parcellation.py	0.00%	8 Missing ⚠️
nipype/interfaces/minc/minc.py	0.00%	3 Missing ⚠️
nipype/interfaces/ants/resampling.py	0.00%	2 Missing ⚠️
nipype/interfaces/io.py	0.00%	2 Missing ⚠️
nipype/interfaces/mrtrix3/connectivity.py	0.00%	2 Missing ⚠️
nipype/__init__.py	0.00%	1 Missing ⚠️
nipype/algorithms/misc.py	0.00%	1 Missing ⚠️
nipype/interfaces/cmtk/tests/test_nbs.py	50.00%	1 Missing ⚠️
nipype/interfaces/dipy/simulate.py	0.00%	1 Missing ⚠️
nipype/interfaces/tests/test_io.py	0.00%	1 Missing ⚠️
... and 8 more

❗ There is a different number of reports uploaded between BASE (4d1352a) and HEAD (70f42d4). Click for more details.

HEAD has 62 uploads less than BASE

Flag	BASE (4d1352a)	HEAD (70f42d4)
	69	7

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #3681       +/-   ##
===========================================
- Coverage   70.83%   39.46%   -31.37%     
===========================================
  Files        1276     1276               
  Lines       59314    59203      -111     
  Branches     9824     9824               
===========================================
- Hits        42013    23365    -18648     
- Misses      16125    35671    +19546     
+ Partials     1176      167     -1009     

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