diff --git a/nipype/__init__.py b/nipype/__init__.py
index 22e6f97c2d..54872f193e 100644
--- a/nipype/__init__.py
+++ b/nipype/__init__.py
@@ -25,7 +25,7 @@
     import faulthandler
 
     faulthandler.enable()
-except (ImportError, OSError) as e:
+except (ImportError, OSError):
     pass
 
 config = NipypeConfig()
diff --git a/nipype/algorithms/misc.py b/nipype/algorithms/misc.py
index 8d2e406793..e1a67f0b08 100644
--- a/nipype/algorithms/misc.py
+++ b/nipype/algorithms/misc.py
@@ -1345,7 +1345,7 @@ def split_rois(in_file, mask=None, roishape=None):
     """
     import nibabel as nb
     import numpy as np
-    from math import sqrt, ceil
+    from math import ceil
     import os.path as op
 
     if roishape is None:
diff --git a/nipype/algorithms/tests/test_ErrorMap.py b/nipype/algorithms/tests/test_ErrorMap.py
index c1b3f1cac8..4cd0c7ce7e 100644
--- a/nipype/algorithms/tests/test_ErrorMap.py
+++ b/nipype/algorithms/tests/test_ErrorMap.py
@@ -1,11 +1,8 @@
 #!/usr/bin/env python
 
-import pytest
-from nipype.testing import example_data
 from nipype.algorithms.metrics import ErrorMap
 import nibabel as nb
 import numpy as np
-import os
 
 
 def test_errormap(tmpdir):
diff --git a/nipype/algorithms/tests/test_Overlap.py b/nipype/algorithms/tests/test_Overlap.py
index ee3900e82e..93a7cbb68f 100644
--- a/nipype/algorithms/tests/test_Overlap.py
+++ b/nipype/algorithms/tests/test_Overlap.py
@@ -2,7 +2,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 
-import os
 
 from nipype.testing import example_data
 
diff --git a/nipype/algorithms/tests/test_confounds.py b/nipype/algorithms/tests/test_confounds.py
index 9698b6d2c1..b3fb198707 100644
--- a/nipype/algorithms/tests/test_confounds.py
+++ b/nipype/algorithms/tests/test_confounds.py
@@ -1,5 +1,4 @@
 #!/usr/bin/env python
-import os
 
 import pytest
 from nipype.testing import example_data
diff --git a/nipype/algorithms/tests/test_mesh_ops.py b/nipype/algorithms/tests/test_mesh_ops.py
index 484925ddbb..f626cc6c0c 100644
--- a/nipype/algorithms/tests/test_mesh_ops.py
+++ b/nipype/algorithms/tests/test_mesh_ops.py
@@ -1,10 +1,8 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 
-import os
 
 import pytest
-import nipype.testing as npt
 from nipype.testing import example_data
 import numpy as np
 from nipype.algorithms import mesh as m
diff --git a/nipype/algorithms/tests/test_modelgen.py b/nipype/algorithms/tests/test_modelgen.py
index 2707b93faa..1b1aacae00 100644
--- a/nipype/algorithms/tests/test_modelgen.py
+++ b/nipype/algorithms/tests/test_modelgen.py
@@ -2,7 +2,6 @@
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 
 from copy import deepcopy
-import os
 
 from nibabel import Nifti1Image
 import numpy as np
diff --git a/nipype/algorithms/tests/test_normalize_tpms.py b/nipype/algorithms/tests/test_normalize_tpms.py
index 5f3f2456ca..37eb9bb51b 100644
--- a/nipype/algorithms/tests/test_normalize_tpms.py
+++ b/nipype/algorithms/tests/test_normalize_tpms.py
@@ -1,14 +1,11 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 
-import os
 
-import pytest
 from nipype.testing import example_data
 
 import numpy as np
 import nibabel as nb
-import nipype.testing as nit
 
 from nipype.algorithms.misc import normalize_tpms
 
diff --git a/nipype/algorithms/tests/test_splitmerge.py b/nipype/algorithms/tests/test_splitmerge.py
index 5a8f098c18..af4a920be5 100644
--- a/nipype/algorithms/tests/test_splitmerge.py
+++ b/nipype/algorithms/tests/test_splitmerge.py
@@ -6,8 +6,6 @@
 def test_split_and_merge(tmpdir):
     import numpy as np
     import nibabel as nb
-    import os.path as op
-    import os
 
     from nipype.algorithms.misc import split_rois, merge_rois
 
diff --git a/nipype/interfaces/afni/model.py b/nipype/interfaces/afni/model.py
index a227e90867..e3a7348b3b 100644
--- a/nipype/interfaces/afni/model.py
+++ b/nipype/interfaces/afni/model.py
@@ -12,26 +12,19 @@
 import os
 
 from ..base import (
-    CommandLineInputSpec,
-    CommandLine,
-    Directory,
     TraitedSpec,
     traits,
     isdefined,
     File,
     InputMultiPath,
-    Undefined,
     Str,
     Tuple,
 )
-from ...external.due import BibTeX
 
 from .base import (
-    AFNICommandBase,
     AFNICommand,
     AFNICommandInputSpec,
     AFNICommandOutputSpec,
-    Info,
 )
 
 
diff --git a/nipype/interfaces/ants/base.py b/nipype/interfaces/ants/base.py
index c484104d28..c78a375b02 100644
--- a/nipype/interfaces/ants/base.py
+++ b/nipype/interfaces/ants/base.py
@@ -2,7 +2,7 @@
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """The ants module provides basic functions for interfacing with ANTS tools."""
 import os
-from packaging.version import Version, parse
+from packaging.version import parse
 
 # Local imports
 from ... import logging
diff --git a/nipype/interfaces/ants/resampling.py b/nipype/interfaces/ants/resampling.py
index 2b1da8e9f5..95f29d5982 100644
--- a/nipype/interfaces/ants/resampling.py
+++ b/nipype/interfaces/ants/resampling.py
@@ -122,7 +122,7 @@ def _format_arg(self, opt, spec, val):
             if isdefined(self.inputs.invert_affine):
                 diff_inv = set(self.inputs.invert_affine) - set(affine_invert)
                 if diff_inv:
-                    raise Exceptions(
+                    raise Exception(
                         "Review invert_affine, not all indexes from invert_affine were used, "
                         "check the description for the full definition"
                     )
@@ -275,7 +275,7 @@ def _format_arg(self, opt, spec, val):
             if isdefined(self.inputs.invert_affine):
                 diff_inv = set(self.inputs.invert_affine) - set(affine_invert)
                 if diff_inv:
-                    raise Exceptions(
+                    raise Exception(
                         "Review invert_affine, not all indexes from invert_affine were used, "
                         "check the description for the full definition"
                     )
diff --git a/nipype/interfaces/cat12/preprocess.py b/nipype/interfaces/cat12/preprocess.py
index ebc436c674..0153c556fd 100644
--- a/nipype/interfaces/cat12/preprocess.py
+++ b/nipype/interfaces/cat12/preprocess.py
@@ -576,7 +576,7 @@ def _list_outputs(self):
         ]
 
         outputs["report"] = fname_presuffix(
-            f, prefix=os.path.join("report", f"cat_"), suffix=".xml", use_ext=False
+            f, prefix=os.path.join("report", "cat_"), suffix=".xml", use_ext=False
         )
 
         outputs["label_files"] = [
diff --git a/nipype/interfaces/cmtk/convert.py b/nipype/interfaces/cmtk/convert.py
index b2e21c3bb9..0c38fd3342 100644
--- a/nipype/interfaces/cmtk/convert.py
+++ b/nipype/interfaces/cmtk/convert.py
@@ -2,7 +2,6 @@
 import os.path as op
 import datetime
 import string
-import networkx as nx
 
 from ...utils.filemanip import split_filename
 from ..base import (
@@ -13,7 +12,7 @@
     InputMultiPath,
     isdefined,
 )
-from .base import CFFBaseInterface, have_cfflib
+from .base import CFFBaseInterface
 
 
 def _read_pickle(fname):
diff --git a/nipype/interfaces/cmtk/nbs.py b/nipype/interfaces/cmtk/nbs.py
index 4b4be74ebb..b63144cb50 100644
--- a/nipype/interfaces/cmtk/nbs.py
+++ b/nipype/interfaces/cmtk/nbs.py
@@ -18,7 +18,6 @@
     OutputMultiPath,
     isdefined,
 )
-from .base import have_cv
 
 iflogger = logging.getLogger("nipype.interface")
 
diff --git a/nipype/interfaces/cmtk/nx.py b/nipype/interfaces/cmtk/nx.py
index 53706389aa..ad72582f3d 100644
--- a/nipype/interfaces/cmtk/nx.py
+++ b/nipype/interfaces/cmtk/nx.py
@@ -18,7 +18,6 @@
     OutputMultiPath,
     isdefined,
 )
-from .base import have_cmp
 
 iflogger = logging.getLogger("nipype.interface")
 
diff --git a/nipype/interfaces/cmtk/parcellation.py b/nipype/interfaces/cmtk/parcellation.py
index 548fa99897..65062247d8 100644
--- a/nipype/interfaces/cmtk/parcellation.py
+++ b/nipype/interfaces/cmtk/parcellation.py
@@ -10,7 +10,6 @@
 
 from ... import logging
 from ..base import (
-    BaseInterface,
     LibraryBaseInterface,
     BaseInterfaceInputSpec,
     traits,
@@ -19,13 +18,12 @@
     Directory,
     isdefined,
 )
-from .base import have_cmp
 
 iflogger = logging.getLogger("nipype.interface")
 
 
 def create_annot_label(subject_id, subjects_dir, fs_dir, parcellation_name):
-    import cmp
+    from cmp.configuration import PipelineConfiguration
     from cmp.util import runCmd
 
     iflogger.info("Create the cortical labels necessary for our ROIs")
@@ -33,7 +31,7 @@ def create_annot_label(subject_id, subjects_dir, fs_dir, parcellation_name):
     fs_label_dir = op.join(op.join(subjects_dir, subject_id), "label")
     output_dir = op.abspath(op.curdir)
     paths = []
-    cmp_config = cmp.configuration.PipelineConfiguration()
+    cmp_config = PipelineConfiguration()
     cmp_config.parcellation_scheme = "Lausanne2008"
     for hemi in ["lh", "rh"]:
         spath = (
@@ -334,13 +332,13 @@ def create_annot_label(subject_id, subjects_dir, fs_dir, parcellation_name):
 def create_roi(subject_id, subjects_dir, fs_dir, parcellation_name, dilation):
     """Creates the ROI_%s.nii.gz files using the given parcellation information
     from networks. Iteratively create volume."""
-    import cmp
+    from cmp.configuration import PipelineConfiguration
     from cmp.util import runCmd
 
     iflogger.info("Create the ROIs:")
     output_dir = op.abspath(op.curdir)
     fs_dir = op.join(subjects_dir, subject_id)
-    cmp_config = cmp.configuration.PipelineConfiguration()
+    cmp_config = PipelineConfiguration()
     cmp_config.parcellation_scheme = "Lausanne2008"
     log = cmp_config.get_logger()
     parval = cmp_config._get_lausanne_parcellation("Lausanne2008")[parcellation_name]
@@ -469,12 +467,12 @@ def create_roi(subject_id, subjects_dir, fs_dir, parcellation_name, dilation):
 
 
 def create_wm_mask(subject_id, subjects_dir, fs_dir, parcellation_name):
-    import cmp
+    from cmp.configuration import PipelineConfiguration
     import scipy.ndimage.morphology as nd
 
     iflogger.info("Create white matter mask")
     fs_dir = op.join(subjects_dir, subject_id)
-    cmp_config = cmp.configuration.PipelineConfiguration()
+    cmp_config = PipelineConfiguration()
     cmp_config.parcellation_scheme = "Lausanne2008"
     pgpath = cmp_config._get_lausanne_parcellation("Lausanne2008")[parcellation_name][
         "node_information_graphml"
@@ -620,10 +618,11 @@ def create_wm_mask(subject_id, subjects_dir, fs_dir, parcellation_name):
 def crop_and_move_datasets(
     subject_id, subjects_dir, fs_dir, parcellation_name, out_roi_file, dilation
 ):
+    from cmp.configuration import PipelineConfiguration
     from cmp.util import runCmd
 
     fs_dir = op.join(subjects_dir, subject_id)
-    cmp_config = cmp.configuration.PipelineConfiguration()
+    cmp_config = PipelineConfiguration()
     cmp_config.parcellation_scheme = "Lausanne2008"
     log = cmp_config.get_logger()
     output_dir = op.abspath(op.curdir)
diff --git a/nipype/interfaces/cmtk/tests/test_nbs.py b/nipype/interfaces/cmtk/tests/test_nbs.py
index 51ea9580cd..efc8aed678 100644
--- a/nipype/interfaces/cmtk/tests/test_nbs.py
+++ b/nipype/interfaces/cmtk/tests/test_nbs.py
@@ -8,7 +8,7 @@
 have_cv = True
 try:
     package_check("cviewer")
-except Exception as e:
+except Exception:
     have_cv = False
 
 
@@ -39,7 +39,7 @@ def test_importerror(creating_graphs, tmpdir):
     nbs.inputs.in_group2 = group2
     nbs.inputs.edge_key = "weight"
 
-    with pytest.raises(ImportError) as e:
+    with pytest.raises(ImportError):
         nbs.run()
 
 
diff --git a/nipype/interfaces/dipy/base.py b/nipype/interfaces/dipy/base.py
index 12ca3be085..ec19d1fe7b 100644
--- a/nipype/interfaces/dipy/base.py
+++ b/nipype/interfaces/dipy/base.py
@@ -3,7 +3,6 @@
 import os.path as op
 import inspect
 import numpy as np
-from ... import logging
 from ..base import (
     traits,
     File,
diff --git a/nipype/interfaces/dipy/reconstruction.py b/nipype/interfaces/dipy/reconstruction.py
index 1b07bbf6d4..084fd7c501 100644
--- a/nipype/interfaces/dipy/reconstruction.py
+++ b/nipype/interfaces/dipy/reconstruction.py
@@ -85,7 +85,6 @@ class RESTORE(DipyDiffusionInterface):
     def _run_interface(self, runtime):
         from scipy.special import gamma
         from dipy.reconst.dti import TensorModel
-        import gc
 
         img = nb.load(self.inputs.in_file)
         hdr = img.header.copy()
@@ -222,7 +221,6 @@ class EstimateResponseSH(DipyDiffusionInterface):
     output_spec = EstimateResponseSHOutputSpec
 
     def _run_interface(self, runtime):
-        from dipy.core.gradients import GradientTable
         from dipy.reconst.dti import fractional_anisotropy, mean_diffusivity
         from dipy.reconst.csdeconv import recursive_response, auto_response
 
diff --git a/nipype/interfaces/dipy/simulate.py b/nipype/interfaces/dipy/simulate.py
index 3fc812e365..6959e0a31d 100644
--- a/nipype/interfaces/dipy/simulate.py
+++ b/nipype/interfaces/dipy/simulate.py
@@ -324,7 +324,7 @@ def _generate_gradients(ndirs=64, values=[1000, 3000], nb0s=1):
 
     """
     import numpy as np
-    from dipy.core.sphere import disperse_charges, Sphere, HemiSphere
+    from dipy.core.sphere import disperse_charges, HemiSphere
     from dipy.core.gradients import gradient_table
 
     theta = np.pi * np.random.rand(ndirs)
diff --git a/nipype/interfaces/freesurfer/longitudinal.py b/nipype/interfaces/freesurfer/longitudinal.py
index 923ef45eee..227ea76775 100644
--- a/nipype/interfaces/freesurfer/longitudinal.py
+++ b/nipype/interfaces/freesurfer/longitudinal.py
@@ -13,18 +13,13 @@
     InputMultiPath,
     OutputMultiPath,
     isdefined,
-    InputMultiObject,
-    Directory,
 )
 from .base import (
     FSCommand,
     FSTraitedSpec,
     FSCommandOpenMP,
     FSTraitedSpecOpenMP,
-    CommandLine,
 )
-from .preprocess import ReconAllInputSpec
-from ..io import FreeSurferSource
 
 __docformat__ = "restructuredtext"
 iflogger = logging.getLogger("nipype.interface")
diff --git a/nipype/interfaces/freesurfer/tests/test_model.py b/nipype/interfaces/freesurfer/tests/test_model.py
index 0c56a87522..f300edf3a1 100644
--- a/nipype/interfaces/freesurfer/tests/test_model.py
+++ b/nipype/interfaces/freesurfer/tests/test_model.py
@@ -1,7 +1,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 
-import os
 import numpy as np
 import nibabel as nb
 
diff --git a/nipype/interfaces/fsl/aroma.py b/nipype/interfaces/fsl/aroma.py
index 85033a3f88..b699cd47e2 100644
--- a/nipype/interfaces/fsl/aroma.py
+++ b/nipype/interfaces/fsl/aroma.py
@@ -11,7 +11,6 @@
     File,
     Directory,
     traits,
-    isdefined,
 )
 import os
 
diff --git a/nipype/interfaces/fsl/tests/test_base.py b/nipype/interfaces/fsl/tests/test_base.py
index d87bc73d70..2b07381e81 100644
--- a/nipype/interfaces/fsl/tests/test_base.py
+++ b/nipype/interfaces/fsl/tests/test_base.py
@@ -4,7 +4,7 @@
 
 import nipype.interfaces.fsl as fsl
 from nipype.interfaces.base import InterfaceResult
-from nipype.interfaces.fsl import check_fsl, no_fsl
+from nipype.interfaces.fsl import no_fsl
 
 import pytest
 
diff --git a/nipype/interfaces/fsl/tests/test_epi.py b/nipype/interfaces/fsl/tests/test_epi.py
index 6e796324a8..715da57f7d 100644
--- a/nipype/interfaces/fsl/tests/test_epi.py
+++ b/nipype/interfaces/fsl/tests/test_epi.py
@@ -1,6 +1,5 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
-import os
 
 import pytest
 from nipype.testing.fixtures import create_files_in_directory
diff --git a/nipype/interfaces/fsl/tests/test_model.py b/nipype/interfaces/fsl/tests/test_model.py
index 7278f1f6aa..5b43850c43 100644
--- a/nipype/interfaces/fsl/tests/test_model.py
+++ b/nipype/interfaces/fsl/tests/test_model.py
@@ -1,6 +1,5 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
-import os
 
 import pytest
 import nipype.interfaces.fsl.model as fsl
diff --git a/nipype/interfaces/fsl/tests/test_preprocess.py b/nipype/interfaces/fsl/tests/test_preprocess.py
index 7f076f8d30..143179a5ec 100644
--- a/nipype/interfaces/fsl/tests/test_preprocess.py
+++ b/nipype/interfaces/fsl/tests/test_preprocess.py
@@ -4,7 +4,6 @@
 from copy import deepcopy
 
 import pytest
-import pdb
 from nipype.utils.filemanip import split_filename, ensure_list
 from .. import preprocess as fsl
 from nipype.interfaces.fsl import Info
@@ -579,7 +578,6 @@ def test_applywarp(setup_flirt):
 def setup_fugue(tmpdir):
     import nibabel as nb
     import numpy as np
-    import os.path as op
 
     d = np.ones((80, 80, 80))
     infile = tmpdir.join("dumbfile.nii.gz").strpath
diff --git a/nipype/interfaces/fsl/tests/test_utils.py b/nipype/interfaces/fsl/tests/test_utils.py
index 8c295a9fb4..bfe895c6ee 100644
--- a/nipype/interfaces/fsl/tests/test_utils.py
+++ b/nipype/interfaces/fsl/tests/test_utils.py
@@ -5,10 +5,9 @@
 
 import numpy as np
 
-import nibabel as nb
 import pytest
 import nipype.interfaces.fsl.utils as fsl
-from nipype.interfaces.fsl import no_fsl, Info
+from nipype.interfaces.fsl import no_fsl
 
 from nipype.testing.fixtures import create_files_in_directory_plus_output_type
 
diff --git a/nipype/interfaces/io.py b/nipype/interfaces/io.py
index eb64dd141d..46cdfb44f2 100644
--- a/nipype/interfaces/io.py
+++ b/nipype/interfaces/io.py
@@ -530,7 +530,7 @@ def _fetch_bucket(self, bucket_name):
         try:
             import boto3
             import botocore
-        except ImportError as exc:
+        except ImportError:
             err_msg = "Boto3 package is not installed - install boto3 and try again."
             raise Exception(err_msg)
 
@@ -572,7 +572,7 @@ def _fetch_bucket(self, bucket_name):
         # And try fetch the bucket with the name argument
         try:
             _get_head_bucket(s3_resource, bucket_name)
-        except Exception as exc:
+        except Exception:
             # Try to connect anonymously
             s3_resource.meta.client.meta.events.register(
                 "choose-signer.s3.*", botocore.handlers.disable_signing
@@ -2619,7 +2619,6 @@ def _list_outputs(self):
                             )
                         if len(arg) > maxlen:
                             maxlen = len(arg)
-                outfiles = []
                 for i in range(maxlen):
                     argtuple = []
                     for arg in arglist:
diff --git a/nipype/interfaces/minc/minc.py b/nipype/interfaces/minc/minc.py
index dbcc1313f8..bf80e23732 100644
--- a/nipype/interfaces/minc/minc.py
+++ b/nipype/interfaces/minc/minc.py
@@ -3403,7 +3403,7 @@ def _gen_filename(self, name):
                     + ".xfm"
                 )
         else:
-            raise NotImplemented
+            raise NotImplementedError
 
     def _list_outputs(self):
         outputs = self.output_spec().get()
@@ -3502,7 +3502,7 @@ def _gen_filename(self, name):
                     + ".xfm"
                 )
         else:
-            raise NotImplemented
+            raise NotImplementedError
 
     def _gen_outfilename(self):
         return self._gen_filename("output_file")
@@ -3573,7 +3573,7 @@ def _gen_filename(self, name):
                     + ".xfm"
                 )
         else:
-            raise NotImplemented
+            raise NotImplementedError
 
     def _gen_outfilename(self):
         return self._gen_filename("output_file")
diff --git a/nipype/interfaces/minc/testdata.py b/nipype/interfaces/minc/testdata.py
index 9bd06355d1..1d2ff36d6f 100644
--- a/nipype/interfaces/minc/testdata.py
+++ b/nipype/interfaces/minc/testdata.py
@@ -1,4 +1,3 @@
-import os
 from ...testing import example_data
 
 minc2Dfile = example_data("minc_test_2D_00.mnc")
diff --git a/nipype/interfaces/mipav/developer.py b/nipype/interfaces/mipav/developer.py
index f0d67eb9ba..a76f2e35c4 100644
--- a/nipype/interfaces/mipav/developer.py
+++ b/nipype/interfaces/mipav/developer.py
@@ -1,19 +1,13 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ..base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/mrtrix/convert.py b/nipype/interfaces/mrtrix/convert.py
index f47bc0eff2..783974c667 100644
--- a/nipype/interfaces/mrtrix/convert.py
+++ b/nipype/interfaces/mrtrix/convert.py
@@ -9,7 +9,7 @@
 from ... import logging
 from ...utils.filemanip import split_filename
 from ..base import TraitedSpec, File, isdefined
-from ..dipy.base import DipyBaseInterface, HAVE_DIPY as have_dipy
+from ..dipy.base import DipyBaseInterface
 
 iflogger = logging.getLogger("nipype.interface")
 
diff --git a/nipype/interfaces/mrtrix3/base.py b/nipype/interfaces/mrtrix3/base.py
index fb13ee2871..cd5d492fcf 100644
--- a/nipype/interfaces/mrtrix3/base.py
+++ b/nipype/interfaces/mrtrix3/base.py
@@ -5,7 +5,6 @@
 from looseversion import LooseVersion
 
 from ... import logging
-from ...utils.filemanip import which
 from ..base import (
     CommandLineInputSpec,
     CommandLine,
diff --git a/nipype/interfaces/mrtrix3/connectivity.py b/nipype/interfaces/mrtrix3/connectivity.py
index ed57ecdefc..a3dde940dc 100644
--- a/nipype/interfaces/mrtrix3/connectivity.py
+++ b/nipype/interfaces/mrtrix3/connectivity.py
@@ -212,7 +212,7 @@ def _parse_inputs(self, skip=None):
 
             path = which(self._cmd)
             if path is None:
-                path = os.getenv(MRTRIX3_HOME, "/opt/mrtrix3")
+                path = os.getenv("MRTRIX3_HOME", "/opt/mrtrix3")
             else:
                 path = op.dirname(op.dirname(path))
 
@@ -304,7 +304,7 @@ def _parse_inputs(self, skip=None):
 
             path = which(self._cmd)
             if path is None:
-                path = os.getenv(MRTRIX3_HOME, "/opt/mrtrix3")
+                path = os.getenv("MRTRIX3_HOME", "/opt/mrtrix3")
             else:
                 path = op.dirname(op.dirname(path))
 
diff --git a/nipype/interfaces/mrtrix3/preprocess.py b/nipype/interfaces/mrtrix3/preprocess.py
index 8f9ddccca8..57cdad0168 100644
--- a/nipype/interfaces/mrtrix3/preprocess.py
+++ b/nipype/interfaces/mrtrix3/preprocess.py
@@ -12,7 +12,6 @@
     InputMultiObject,
     TraitedSpec,
     Undefined,
-    isdefined,
     traits,
     Tuple,
 )
diff --git a/nipype/interfaces/nipy/preprocess.py b/nipype/interfaces/nipy/preprocess.py
index af31a1ef19..a85c8d3ad4 100644
--- a/nipype/interfaces/nipy/preprocess.py
+++ b/nipype/interfaces/nipy/preprocess.py
@@ -5,7 +5,7 @@
 
 from ...utils.filemanip import split_filename, fname_presuffix
 
-from .base import NipyBaseInterface, have_nipy
+from .base import NipyBaseInterface
 from ..base import (
     TraitedSpec,
     traits,
diff --git a/nipype/interfaces/nipy/utils.py b/nipype/interfaces/nipy/utils.py
index cdbb5ea46a..96773f27dc 100644
--- a/nipype/interfaces/nipy/utils.py
+++ b/nipype/interfaces/nipy/utils.py
@@ -2,7 +2,7 @@
 import numpy as np
 import nibabel as nb
 
-from .base import NipyBaseInterface, have_nipy
+from .base import NipyBaseInterface
 from ..base import TraitedSpec, traits, BaseInterfaceInputSpec, File, isdefined
 
 
diff --git a/nipype/interfaces/r.py b/nipype/interfaces/r.py
index 780484bdf8..1894d00960 100644
--- a/nipype/interfaces/r.py
+++ b/nipype/interfaces/r.py
@@ -4,15 +4,12 @@
 import os
 from shutil import which
 
-from .. import config
 from .base import (
     CommandLineInputSpec,
-    InputMultiPath,
     isdefined,
     CommandLine,
     traits,
     File,
-    Directory,
 )
 
 
diff --git a/nipype/interfaces/robex/preprocess.py b/nipype/interfaces/robex/preprocess.py
index 85660f8211..b2e92e94cb 100644
--- a/nipype/interfaces/robex/preprocess.py
+++ b/nipype/interfaces/robex/preprocess.py
@@ -1,15 +1,10 @@
-import os
-from pathlib import Path
-
 from nipype.interfaces.base import (
     TraitedSpec,
     CommandLineInputSpec,
     CommandLine,
     File,
     traits,
-    isdefined,
 )
-from nipype.utils.filemanip import split_filename
 
 
 class RobexInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/semtools/brains/classify.py b/nipype/interfaces/semtools/brains/classify.py
index e1305471f0..149e63c95e 100644
--- a/nipype/interfaces/semtools/brains/classify.py
+++ b/nipype/interfaces/semtools/brains/classify.py
@@ -1,19 +1,12 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ...base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/brains/segmentation.py b/nipype/interfaces/semtools/brains/segmentation.py
index 75105fc0aa..a6dbfbd449 100644
--- a/nipype/interfaces/semtools/brains/segmentation.py
+++ b/nipype/interfaces/semtools/brains/segmentation.py
@@ -1,19 +1,13 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ...base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/brains/utilities.py b/nipype/interfaces/semtools/brains/utilities.py
index 5f76478156..3b5596e6d7 100644
--- a/nipype/interfaces/semtools/brains/utilities.py
+++ b/nipype/interfaces/semtools/brains/utilities.py
@@ -1,19 +1,13 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ...base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/converters.py b/nipype/interfaces/semtools/converters.py
index 65fd1d4739..091f832b2b 100644
--- a/nipype/interfaces/semtools/converters.py
+++ b/nipype/interfaces/semtools/converters.py
@@ -1,19 +1,12 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ..base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/diffusion/diffusion.py b/nipype/interfaces/semtools/diffusion/diffusion.py
index e990606e77..6a85d5cd7a 100644
--- a/nipype/interfaces/semtools/diffusion/diffusion.py
+++ b/nipype/interfaces/semtools/diffusion/diffusion.py
@@ -1,19 +1,14 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ...base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
     Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/diffusion/gtract.py b/nipype/interfaces/semtools/diffusion/gtract.py
index d9bace5e59..58d7264864 100644
--- a/nipype/interfaces/semtools/diffusion/gtract.py
+++ b/nipype/interfaces/semtools/diffusion/gtract.py
@@ -1,19 +1,13 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ...base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/diffusion/maxcurvature.py b/nipype/interfaces/semtools/diffusion/maxcurvature.py
index 66c147ad81..86a7580f2d 100644
--- a/nipype/interfaces/semtools/diffusion/maxcurvature.py
+++ b/nipype/interfaces/semtools/diffusion/maxcurvature.py
@@ -1,19 +1,12 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ...base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/diffusion/tractography/commandlineonly.py b/nipype/interfaces/semtools/diffusion/tractography/commandlineonly.py
index fe4520f9df..e03c8fde9e 100644
--- a/nipype/interfaces/semtools/diffusion/tractography/commandlineonly.py
+++ b/nipype/interfaces/semtools/diffusion/tractography/commandlineonly.py
@@ -1,19 +1,12 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ....base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/diffusion/tractography/fiberprocess.py b/nipype/interfaces/semtools/diffusion/tractography/fiberprocess.py
index d20a7cba53..7efb9c9e23 100644
--- a/nipype/interfaces/semtools/diffusion/tractography/fiberprocess.py
+++ b/nipype/interfaces/semtools/diffusion/tractography/fiberprocess.py
@@ -1,19 +1,12 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ....base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/diffusion/tractography/fibertrack.py b/nipype/interfaces/semtools/diffusion/tractography/fibertrack.py
index 663010632c..1fa64180d5 100644
--- a/nipype/interfaces/semtools/diffusion/tractography/fibertrack.py
+++ b/nipype/interfaces/semtools/diffusion/tractography/fibertrack.py
@@ -1,19 +1,12 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ....base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/diffusion/tractography/ukftractography.py b/nipype/interfaces/semtools/diffusion/tractography/ukftractography.py
index cc3619f8ec..fc8035762d 100644
--- a/nipype/interfaces/semtools/diffusion/tractography/ukftractography.py
+++ b/nipype/interfaces/semtools/diffusion/tractography/ukftractography.py
@@ -1,19 +1,13 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ....base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/featurecreator.py b/nipype/interfaces/semtools/featurecreator.py
index 85c72a993f..08482853a5 100644
--- a/nipype/interfaces/semtools/featurecreator.py
+++ b/nipype/interfaces/semtools/featurecreator.py
@@ -1,19 +1,12 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ..base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/filtering/denoising.py b/nipype/interfaces/semtools/filtering/denoising.py
index 22575b7842..9afd9184fa 100644
--- a/nipype/interfaces/semtools/filtering/denoising.py
+++ b/nipype/interfaces/semtools/filtering/denoising.py
@@ -1,19 +1,13 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ...base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/filtering/featuredetection.py b/nipype/interfaces/semtools/filtering/featuredetection.py
index 7e72c2c2b4..b61cf59a11 100644
--- a/nipype/interfaces/semtools/filtering/featuredetection.py
+++ b/nipype/interfaces/semtools/filtering/featuredetection.py
@@ -1,19 +1,13 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ...base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/legacy/registration.py b/nipype/interfaces/semtools/legacy/registration.py
index e899aa44ab..b0755aff40 100644
--- a/nipype/interfaces/semtools/legacy/registration.py
+++ b/nipype/interfaces/semtools/legacy/registration.py
@@ -1,19 +1,12 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ...base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/registration/brainsfit.py b/nipype/interfaces/semtools/registration/brainsfit.py
index 41d8b2c77f..0ed5dd2be9 100644
--- a/nipype/interfaces/semtools/registration/brainsfit.py
+++ b/nipype/interfaces/semtools/registration/brainsfit.py
@@ -1,19 +1,13 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ...base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/registration/brainsresample.py b/nipype/interfaces/semtools/registration/brainsresample.py
index f7351f17c4..37f2eeb69b 100644
--- a/nipype/interfaces/semtools/registration/brainsresample.py
+++ b/nipype/interfaces/semtools/registration/brainsresample.py
@@ -1,19 +1,13 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ...base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/registration/brainsresize.py b/nipype/interfaces/semtools/registration/brainsresize.py
index ae4c50fe83..f86d7d9e62 100644
--- a/nipype/interfaces/semtools/registration/brainsresize.py
+++ b/nipype/interfaces/semtools/registration/brainsresize.py
@@ -1,19 +1,12 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ...base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/registration/specialized.py b/nipype/interfaces/semtools/registration/specialized.py
index 61e71611e7..68a6a0b993 100644
--- a/nipype/interfaces/semtools/registration/specialized.py
+++ b/nipype/interfaces/semtools/registration/specialized.py
@@ -1,19 +1,13 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ...base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
 
 
diff --git a/nipype/interfaces/semtools/segmentation/specialized.py b/nipype/interfaces/semtools/segmentation/specialized.py
index b00c2309eb..d4f1ab1b07 100644
--- a/nipype/interfaces/semtools/segmentation/specialized.py
+++ b/nipype/interfaces/semtools/segmentation/specialized.py
@@ -1,17 +1,13 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ...base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
     Directory,
     traits,
-    isdefined,
     InputMultiPath,
     OutputMultiPath,
 )
diff --git a/nipype/interfaces/semtools/testing/featuredetection.py b/nipype/interfaces/semtools/testing/featuredetection.py
index 59d7dd3ea7..67aa38746d 100644
--- a/nipype/interfaces/semtools/testing/featuredetection.py
+++ b/nipype/interfaces/semtools/testing/featuredetection.py
@@ -2,18 +2,12 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class SphericalCoordinateGenerationInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/semtools/testing/generateaveragelmkfile.py b/nipype/interfaces/semtools/testing/generateaveragelmkfile.py
index b1c701a119..9235e63dd2 100644
--- a/nipype/interfaces/semtools/testing/generateaveragelmkfile.py
+++ b/nipype/interfaces/semtools/testing/generateaveragelmkfile.py
@@ -2,18 +2,13 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class GenerateAverageLmkFileInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/semtools/testing/landmarkscompare.py b/nipype/interfaces/semtools/testing/landmarkscompare.py
index a03ce653af..7d628518a8 100644
--- a/nipype/interfaces/semtools/testing/landmarkscompare.py
+++ b/nipype/interfaces/semtools/testing/landmarkscompare.py
@@ -2,18 +2,12 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class LandmarksCompareInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/semtools/utilities/brains.py b/nipype/interfaces/semtools/utilities/brains.py
index a7b2591f09..de38a52fc2 100644
--- a/nipype/interfaces/semtools/utilities/brains.py
+++ b/nipype/interfaces/semtools/utilities/brains.py
@@ -1,17 +1,13 @@
 """Autogenerated file - DO NOT EDIT
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
-import os
-
 from ...base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
     Directory,
     traits,
-    isdefined,
     InputMultiPath,
     OutputMultiPath,
 )
diff --git a/nipype/interfaces/slicer/converters.py b/nipype/interfaces/slicer/converters.py
index f9aa9e458b..1be9651f55 100644
--- a/nipype/interfaces/slicer/converters.py
+++ b/nipype/interfaces/slicer/converters.py
@@ -2,18 +2,13 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
     Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class DicomToNrrdConverterInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/diffusion/diffusion.py b/nipype/interfaces/slicer/diffusion/diffusion.py
index 56d398b3b3..3238981562 100644
--- a/nipype/interfaces/slicer/diffusion/diffusion.py
+++ b/nipype/interfaces/slicer/diffusion/diffusion.py
@@ -2,18 +2,14 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
     Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class ResampleDTIVolumeInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/filtering/arithmetic.py b/nipype/interfaces/slicer/filtering/arithmetic.py
index 47fb8da82b..8b729d8c6a 100644
--- a/nipype/interfaces/slicer/filtering/arithmetic.py
+++ b/nipype/interfaces/slicer/filtering/arithmetic.py
@@ -2,18 +2,12 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class MultiplyScalarVolumesInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/filtering/checkerboardfilter.py b/nipype/interfaces/slicer/filtering/checkerboardfilter.py
index 429fdc83b8..336d0b13d7 100644
--- a/nipype/interfaces/slicer/filtering/checkerboardfilter.py
+++ b/nipype/interfaces/slicer/filtering/checkerboardfilter.py
@@ -2,18 +2,13 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class CheckerBoardFilterInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/filtering/denoising.py b/nipype/interfaces/slicer/filtering/denoising.py
index fa8518c1bc..e5d1135038 100644
--- a/nipype/interfaces/slicer/filtering/denoising.py
+++ b/nipype/interfaces/slicer/filtering/denoising.py
@@ -2,18 +2,13 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class GradientAnisotropicDiffusionInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/filtering/extractskeleton.py b/nipype/interfaces/slicer/filtering/extractskeleton.py
index d0ec5ffe98..8b873bad98 100644
--- a/nipype/interfaces/slicer/filtering/extractskeleton.py
+++ b/nipype/interfaces/slicer/filtering/extractskeleton.py
@@ -2,18 +2,12 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class ExtractSkeletonInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/filtering/histogrammatching.py b/nipype/interfaces/slicer/filtering/histogrammatching.py
index c9eb9af89c..df1d87bd2f 100644
--- a/nipype/interfaces/slicer/filtering/histogrammatching.py
+++ b/nipype/interfaces/slicer/filtering/histogrammatching.py
@@ -2,18 +2,12 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class HistogramMatchingInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/filtering/imagelabelcombine.py b/nipype/interfaces/slicer/filtering/imagelabelcombine.py
index b8e2202d4d..6941ff05fe 100644
--- a/nipype/interfaces/slicer/filtering/imagelabelcombine.py
+++ b/nipype/interfaces/slicer/filtering/imagelabelcombine.py
@@ -2,18 +2,12 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class ImageLabelCombineInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/filtering/morphology.py b/nipype/interfaces/slicer/filtering/morphology.py
index 8338f56407..bd1232dece 100644
--- a/nipype/interfaces/slicer/filtering/morphology.py
+++ b/nipype/interfaces/slicer/filtering/morphology.py
@@ -2,18 +2,12 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class GrayscaleGrindPeakImageFilterInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/filtering/n4itkbiasfieldcorrection.py b/nipype/interfaces/slicer/filtering/n4itkbiasfieldcorrection.py
index ccf066f4da..69768e3b7e 100644
--- a/nipype/interfaces/slicer/filtering/n4itkbiasfieldcorrection.py
+++ b/nipype/interfaces/slicer/filtering/n4itkbiasfieldcorrection.py
@@ -2,18 +2,13 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class N4ITKBiasFieldCorrectionInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/filtering/resamplescalarvectordwivolume.py b/nipype/interfaces/slicer/filtering/resamplescalarvectordwivolume.py
index 74db29363a..e9d6a8271f 100644
--- a/nipype/interfaces/slicer/filtering/resamplescalarvectordwivolume.py
+++ b/nipype/interfaces/slicer/filtering/resamplescalarvectordwivolume.py
@@ -2,18 +2,13 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class ResampleScalarVectorDWIVolumeInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/filtering/thresholdscalarvolume.py b/nipype/interfaces/slicer/filtering/thresholdscalarvolume.py
index 0bcf5b413c..d5f0cef21f 100644
--- a/nipype/interfaces/slicer/filtering/thresholdscalarvolume.py
+++ b/nipype/interfaces/slicer/filtering/thresholdscalarvolume.py
@@ -2,18 +2,12 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class ThresholdScalarVolumeInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/filtering/votingbinaryholefillingimagefilter.py b/nipype/interfaces/slicer/filtering/votingbinaryholefillingimagefilter.py
index 73c7ed5b47..9903b07793 100644
--- a/nipype/interfaces/slicer/filtering/votingbinaryholefillingimagefilter.py
+++ b/nipype/interfaces/slicer/filtering/votingbinaryholefillingimagefilter.py
@@ -2,18 +2,13 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class VotingBinaryHoleFillingImageFilterInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/legacy/converters.py b/nipype/interfaces/slicer/legacy/converters.py
index 053415b189..c5f0ecd21a 100644
--- a/nipype/interfaces/slicer/legacy/converters.py
+++ b/nipype/interfaces/slicer/legacy/converters.py
@@ -2,18 +2,12 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class BSplineToDeformationFieldInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/legacy/diffusion/denoising.py b/nipype/interfaces/slicer/legacy/diffusion/denoising.py
index 5adda02a5a..8cccf949bb 100644
--- a/nipype/interfaces/slicer/legacy/diffusion/denoising.py
+++ b/nipype/interfaces/slicer/legacy/diffusion/denoising.py
@@ -2,18 +2,13 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class DWIUnbiasedNonLocalMeansFilterInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/legacy/filtering.py b/nipype/interfaces/slicer/legacy/filtering.py
index 749ba3942c..978752f25b 100644
--- a/nipype/interfaces/slicer/legacy/filtering.py
+++ b/nipype/interfaces/slicer/legacy/filtering.py
@@ -2,18 +2,13 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class OtsuThresholdImageFilterInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/legacy/registration.py b/nipype/interfaces/slicer/legacy/registration.py
index 7eee2b069e..01c9d17cb8 100644
--- a/nipype/interfaces/slicer/legacy/registration.py
+++ b/nipype/interfaces/slicer/legacy/registration.py
@@ -2,18 +2,13 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class BSplineDeformableRegistrationInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/legacy/segmentation.py b/nipype/interfaces/slicer/legacy/segmentation.py
index 0f51afe35c..664d9913ae 100644
--- a/nipype/interfaces/slicer/legacy/segmentation.py
+++ b/nipype/interfaces/slicer/legacy/segmentation.py
@@ -2,18 +2,12 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class OtsuThresholdSegmentationInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/quantification/changequantification.py b/nipype/interfaces/slicer/quantification/changequantification.py
index 0e0f5dc20a..952a8d6e1d 100644
--- a/nipype/interfaces/slicer/quantification/changequantification.py
+++ b/nipype/interfaces/slicer/quantification/changequantification.py
@@ -2,18 +2,12 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class IntensityDifferenceMetricInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/quantification/petstandarduptakevaluecomputation.py b/nipype/interfaces/slicer/quantification/petstandarduptakevaluecomputation.py
index 2c4c337dac..4861eca651 100644
--- a/nipype/interfaces/slicer/quantification/petstandarduptakevaluecomputation.py
+++ b/nipype/interfaces/slicer/quantification/petstandarduptakevaluecomputation.py
@@ -2,18 +2,13 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
     Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class PETStandardUptakeValueComputationInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/registration/brainsfit.py b/nipype/interfaces/slicer/registration/brainsfit.py
index c9b61e8da0..079d538499 100644
--- a/nipype/interfaces/slicer/registration/brainsfit.py
+++ b/nipype/interfaces/slicer/registration/brainsfit.py
@@ -2,18 +2,13 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class BRAINSFitInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/registration/brainsresample.py b/nipype/interfaces/slicer/registration/brainsresample.py
index 201bbeab55..82a69f6d0a 100644
--- a/nipype/interfaces/slicer/registration/brainsresample.py
+++ b/nipype/interfaces/slicer/registration/brainsresample.py
@@ -2,18 +2,13 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class BRAINSResampleInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/registration/specialized.py b/nipype/interfaces/slicer/registration/specialized.py
index e03f1a95b1..30688928c2 100644
--- a/nipype/interfaces/slicer/registration/specialized.py
+++ b/nipype/interfaces/slicer/registration/specialized.py
@@ -2,18 +2,13 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class ACPCTransformInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/segmentation/simpleregiongrowingsegmentation.py b/nipype/interfaces/slicer/segmentation/simpleregiongrowingsegmentation.py
index 98af4fdc1b..4d652ffb0e 100644
--- a/nipype/interfaces/slicer/segmentation/simpleregiongrowingsegmentation.py
+++ b/nipype/interfaces/slicer/segmentation/simpleregiongrowingsegmentation.py
@@ -2,18 +2,13 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class SimpleRegionGrowingSegmentationInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/segmentation/specialized.py b/nipype/interfaces/slicer/segmentation/specialized.py
index 90374ddd0c..fc278b1da5 100644
--- a/nipype/interfaces/slicer/segmentation/specialized.py
+++ b/nipype/interfaces/slicer/segmentation/specialized.py
@@ -2,18 +2,14 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
     Directory,
     traits,
-    isdefined,
     InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class RobustStatisticsSegmenterInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/surface.py b/nipype/interfaces/slicer/surface.py
index 7a4c77af70..3993e5028d 100644
--- a/nipype/interfaces/slicer/surface.py
+++ b/nipype/interfaces/slicer/surface.py
@@ -2,18 +2,14 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
     InputMultiPath,
     OutputMultiPath,
 )
-import os
 
 
 class MergeModelsInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/slicer/utilities.py b/nipype/interfaces/slicer/utilities.py
index 2e0eae1165..eb079766c9 100644
--- a/nipype/interfaces/slicer/utilities.py
+++ b/nipype/interfaces/slicer/utilities.py
@@ -2,18 +2,12 @@
 If you spot a bug, please report it on the mailing list and/or change the generator."""
 
 from nipype.interfaces.base import (
-    CommandLine,
     CommandLineInputSpec,
     SEMLikeCommandLine,
     TraitedSpec,
     File,
-    Directory,
     traits,
-    isdefined,
-    InputMultiPath,
-    OutputMultiPath,
 )
-import os
 
 
 class EMSegmentTransformToNewFormatInputSpec(CommandLineInputSpec):
diff --git a/nipype/interfaces/spm/base.py b/nipype/interfaces/spm/base.py
index ac20682696..e6b898c78b 100644
--- a/nipype/interfaces/spm/base.py
+++ b/nipype/interfaces/spm/base.py
@@ -38,7 +38,7 @@
 )
 from ..base.traits_extension import NoDefaultSpecified
 from ..matlab import MatlabCommand
-from ...external.due import due, Doi, BibTeX
+from ...external.due import BibTeX
 
 __docformat__ = "restructuredtext"
 logger = logging.getLogger("nipype.interface")
diff --git a/nipype/interfaces/tests/test_extra_dcm2nii.py b/nipype/interfaces/tests/test_extra_dcm2nii.py
index 0b0c132f7d..b093d26e6d 100644
--- a/nipype/interfaces/tests/test_extra_dcm2nii.py
+++ b/nipype/interfaces/tests/test_extra_dcm2nii.py
@@ -1,6 +1,5 @@
 import os
 import pytest
-import shutil
 
 from nipype.interfaces.dcm2nii import Dcm2niix
 
diff --git a/nipype/interfaces/tests/test_io.py b/nipype/interfaces/tests/test_io.py
index d0af921f09..fc7f03db9f 100644
--- a/nipype/interfaces/tests/test_io.py
+++ b/nipype/interfaces/tests/test_io.py
@@ -565,7 +565,7 @@ def test_freesurfersource():
 
 def test_freesurfersource_incorrectdir():
     fss = nio.FreeSurferSource()
-    with pytest.raises(TraitError) as err:
+    with pytest.raises(TraitError):
         fss.inputs.subjects_dir = "path/to/no/existing/directory"
 
 
diff --git a/nipype/interfaces/utility/tests/test_csv.py b/nipype/interfaces/utility/tests/test_csv.py
index 8a8f06e509..2ce78876cc 100644
--- a/nipype/interfaces/utility/tests/test_csv.py
+++ b/nipype/interfaces/utility/tests/test_csv.py
@@ -29,7 +29,6 @@ def test_csvReader(tmpdir):
 
 
 def test_csvReader_quoted(tmpdir):
-    header = "files,labels,erosion\n"
     lines = ['foo,"hello, world",300.1\n']
 
     name = tmpdir.join("testfile.csv").strpath
diff --git a/nipype/interfaces/utility/tests/test_wrappers.py b/nipype/interfaces/utility/tests/test_wrappers.py
index f3e378c2c3..345d6483ad 100644
--- a/nipype/interfaces/utility/tests/test_wrappers.py
+++ b/nipype/interfaces/utility/tests/test_wrappers.py
@@ -1,6 +1,5 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
-import os
 import pytest
 
 from nipype.interfaces import utility
diff --git a/nipype/interfaces/vtkbase.py b/nipype/interfaces/vtkbase.py
index dffcb6e2a4..4b49d56815 100644
--- a/nipype/interfaces/vtkbase.py
+++ b/nipype/interfaces/vtkbase.py
@@ -63,7 +63,7 @@ def vtk_old():
     """Checks if VTK uses the old-style pipeline (VTK<6.0)"""
     global _vtk_version
     if _vtk_version is None:
-        raise RuntimeException("VTK is not correctly installed.")
+        raise RuntimeError("VTK is not correctly installed.")
     return _vtk_version[0] < 6
 
 
diff --git a/nipype/pipeline/engine/base.py b/nipype/pipeline/engine/base.py
index f2e1009884..27d3426863 100644
--- a/nipype/pipeline/engine/base.py
+++ b/nipype/pipeline/engine/base.py
@@ -3,7 +3,6 @@
 """Defines functionality for pipelined execution of interfaces."""
 from copy import deepcopy
 import re
-import numpy as np
 
 from ... import config
 from ...interfaces.base import DynamicTraitedSpec
diff --git a/nipype/pipeline/engine/nodes.py b/nipype/pipeline/engine/nodes.py
index 5f357abb00..31ee29e04d 100644
--- a/nipype/pipeline/engine/nodes.py
+++ b/nipype/pipeline/engine/nodes.py
@@ -36,7 +36,6 @@
 from ...interfaces.base import (
     traits,
     InputMultiPath,
-    CommandLine,
     Undefined,
     DynamicTraitedSpec,
     Bunch,
@@ -1382,7 +1381,7 @@ def _run_interface(self, execute=True, updatehash=False):
                 )
             )
         except Exception as msg:
-            result.runtime.stderr = "%s\n\n%s".format(
+            result.runtime.stderr = "{}\n\n{}".format(
                 getattr(result.runtime, "stderr", ""), msg
             )
             _save_resultfile(
diff --git a/nipype/pipeline/plugins/base.py b/nipype/pipeline/plugins/base.py
index 1ea62c890e..1571ab71a9 100644
--- a/nipype/pipeline/plugins/base.py
+++ b/nipype/pipeline/plugins/base.py
@@ -541,7 +541,7 @@ def _get_result(self, taskid):
                     "Node working directory: ({}) ".format(taskid, timeout, node_dir)
                 )
                 raise OSError(error_message)
-            except OSError as e:
+            except OSError:
                 result_data["traceback"] = "\n".join(format_exception(*sys.exc_info()))
         else:
             results_file = glob(os.path.join(node_dir, "result_*.pklz"))[0]
diff --git a/nipype/pipeline/plugins/tests/test_oar.py b/nipype/pipeline/plugins/tests/test_oar.py
index 57d0d54e84..fcb1efac6e 100644
--- a/nipype/pipeline/plugins/tests/test_oar.py
+++ b/nipype/pipeline/plugins/tests/test_oar.py
@@ -1,3 +1,4 @@
+import os
 from shutil import which
 
 import nipype.interfaces.base as nib
diff --git a/nipype/pipeline/plugins/tests/test_sgelike.py b/nipype/pipeline/plugins/tests/test_sgelike.py
index a150309e1f..26c3d70a06 100644
--- a/nipype/pipeline/plugins/tests/test_sgelike.py
+++ b/nipype/pipeline/plugins/tests/test_sgelike.py
@@ -27,7 +27,7 @@ def test_crashfile_creation(tmp_path):
     pipe.config["execution"]["crashdump_dir"] = str(tmp_path)
     pipe.add_nodes([pe.Node(interface=Function(function=crasher), name="crasher")])
     sgelike_plugin = SGELikeBatchManagerBase("")
-    with pytest.raises(RuntimeError) as e:
+    with pytest.raises(RuntimeError):
         assert pipe.run(plugin=sgelike_plugin)
 
     crashfiles = list(tmp_path.glob("crash*crasher*.pklz")) + list(
diff --git a/nipype/pipeline/plugins/tests/test_somaflow.py b/nipype/pipeline/plugins/tests/test_somaflow.py
index f9a6a07b16..4c074522d8 100644
--- a/nipype/pipeline/plugins/tests/test_somaflow.py
+++ b/nipype/pipeline/plugins/tests/test_somaflow.py
@@ -1,5 +1,4 @@
 import os
-from time import sleep
 
 import nipype.interfaces.base as nib
 import pytest
diff --git a/nipype/pipeline/plugins/tests/test_tools.py b/nipype/pipeline/plugins/tests/test_tools.py
index 454621573e..e21ef42072 100644
--- a/nipype/pipeline/plugins/tests/test_tools.py
+++ b/nipype/pipeline/plugins/tests/test_tools.py
@@ -2,8 +2,6 @@
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """Tests for the engine module
 """
-import numpy as np
-import scipy.sparse as ssp
 import re
 
 from unittest import mock
diff --git a/nipype/refs.py b/nipype/refs.py
index 0478d7ceed..9d81b314eb 100644
--- a/nipype/refs.py
+++ b/nipype/refs.py
@@ -1,7 +1,7 @@
 # Use duecredit (duecredit.org) to provide a citation to relevant work to
 # be cited. This does nothing, unless the user has duecredit installed,
 # And calls this with duecredit (as in `python -m duecredit script.py`):
-from .external.due import due, Doi, BibTeX
+from .external.due import due, Doi
 
 due.cite(
     Doi("10.3389/fninf.2011.00013"),
diff --git a/nipype/scripts/crash_files.py b/nipype/scripts/crash_files.py
index 84464ccddb..1caa0c430b 100644
--- a/nipype/scripts/crash_files.py
+++ b/nipype/scripts/crash_files.py
@@ -1,7 +1,5 @@
 """Utilities to manipulate and search through .pklz crash files."""
 
-import re
-import sys
 import os.path as op
 from glob import glob
 
diff --git a/nipype/sphinxext/plot_workflow.py b/nipype/sphinxext/plot_workflow.py
index ff8b02249a..74745f99cb 100644
--- a/nipype/sphinxext/plot_workflow.py
+++ b/nipype/sphinxext/plot_workflow.py
@@ -113,7 +113,6 @@
 import re
 import textwrap
 from os.path import relpath
-from errno import EEXIST
 import traceback
 
 missing_imports = []
@@ -673,7 +672,7 @@ def _dummy_print(*arg, **kwarg):
             exec(code, ns)
             if function_name is not None:
                 exec(function_name + "()", ns)
-        except (Exception, SystemExit) as err:
+        except (Exception, SystemExit):
             raise GraphError(traceback.format_exc())
     finally:
         os.chdir(pwd)
diff --git a/nipype/testing/tests/test_utils.py b/nipype/testing/tests/test_utils.py
index 0055038392..9217d54694 100644
--- a/nipype/testing/tests/test_utils.py
+++ b/nipype/testing/tests/test_utils.py
@@ -4,7 +4,6 @@
 """
 
 import os
-import warnings
 import subprocess
 from unittest.mock import patch, MagicMock
 from unittest import SkipTest
diff --git a/nipype/utils/config.py b/nipype/utils/config.py
index e7ec7fd64b..8317270d83 100644
--- a/nipype/utils/config.py
+++ b/nipype/utils/config.py
@@ -15,7 +15,6 @@
 from warnings import warn
 from looseversion import LooseVersion
 import configparser
-import numpy as np
 
 from simplejson import load, dump
 
diff --git a/nipype/utils/draw_gantt_chart.py b/nipype/utils/draw_gantt_chart.py
index ef4ec58ec2..3ae4b77246 100644
--- a/nipype/utils/draw_gantt_chart.py
+++ b/nipype/utils/draw_gantt_chart.py
@@ -5,7 +5,6 @@
 ``nipype.utils.profiler.log_nodes_cb()``
 """
 # Import packages
-import sys
 import random
 import datetime
 import simplejson as json
diff --git a/nipype/utils/filemanip.py b/nipype/utils/filemanip.py
index 6aa0c5e74c..568ba28ae2 100644
--- a/nipype/utils/filemanip.py
+++ b/nipype/utils/filemanip.py
@@ -47,7 +47,7 @@ def split_filename(fname):
     fname : str
         filename from fname, without extension
     ext : str
-        file extension from fname
+        file extension from fname706
 
     Examples
     --------
@@ -700,10 +700,11 @@ def savepkl(filename, record, versioning=False):
             os.rename(tmpfile, filename)
             break
         except FileNotFoundError as e:
+            last_e = e
             fmlogger.debug(str(e))
             sleep(2)
     else:
-        raise e
+        raise last_e
 
 
 rst_levels = ["=", "-", "~", "+"]
diff --git a/nipype/utils/nipype_cmd.py b/nipype/utils/nipype_cmd.py
index eabe84d4c3..ec0f603f3f 100644
--- a/nipype/utils/nipype_cmd.py
+++ b/nipype/utils/nipype_cmd.py
@@ -5,7 +5,6 @@
 
 from ..interfaces.base import Interface, InputMultiPath, traits
 from ..interfaces.base.support import get_trait_desc
-from .misc import str2bool
 
 
 def listClasses(module=None):
diff --git a/nipype/utils/profiler.py b/nipype/utils/profiler.py
index 370097e90b..cc2b4f7905 100644
--- a/nipype/utils/profiler.py
+++ b/nipype/utils/profiler.py
@@ -10,7 +10,7 @@
 
 try:
     import psutil
-except ImportError as exc:
+except ImportError:
     psutil = None
 
 
diff --git a/nipype/utils/provenance.py b/nipype/utils/provenance.py
index 95e54d405d..ba71ac6d6e 100644
--- a/nipype/utils/provenance.py
+++ b/nipype/utils/provenance.py
@@ -120,7 +120,7 @@ def _get_sorteddict(object, dictwithhash=False):
             else:
                 out = hash
         elif isinstance(object, float):
-            out = f"%.10f"
+            out = f"{object:.10f}"
         else:
             out = object
     return out
diff --git a/nipype/utils/tests/test_filemanip.py b/nipype/utils/tests/test_filemanip.py
index a104903a06..be16a9cea1 100644
--- a/nipype/utils/tests/test_filemanip.py
+++ b/nipype/utils/tests/test_filemanip.py
@@ -26,7 +26,6 @@
     get_related_files,
     indirectory,
     loadpkl,
-    loadcrash,
     savepkl,
     path_resolve,
     write_rst_list,
diff --git a/nipype/utils/tests/test_provenance.py b/nipype/utils/tests/test_provenance.py
index ffdabd6f83..f440acb2ed 100644
--- a/nipype/utils/tests/test_provenance.py
+++ b/nipype/utils/tests/test_provenance.py
@@ -1,6 +1,5 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
-import os
 from nibabel.optpkg import optional_package
 import pytest