diff --git a/nibabel/cifti2/cifti2.py b/nibabel/cifti2/cifti2.py
index 0b2b7f2a9a..948fe0d0d0 100644
--- a/nibabel/cifti2/cifti2.py
+++ b/nibabel/cifti2/cifti2.py
@@ -1156,8 +1156,7 @@ def get_index_map(self, index):
             a2md = self._get_indices_from_mim(v)
             if index in a2md:
                 return v
-        else:
-            raise Cifti2HeaderError("Index not mapped")
+        raise Cifti2HeaderError("Index not mapped")
 
     def _validate_new_mim(self, value):
         if value.applies_to_matrix_dimension is None:
diff --git a/nibabel/cmdline/dicomfs.py b/nibabel/cmdline/dicomfs.py
index 6e53be103b..be3acad269 100644
--- a/nibabel/cmdline/dicomfs.py
+++ b/nibabel/cmdline/dicomfs.py
@@ -71,7 +71,7 @@ def get_paths(self):
         for study in dft.get_studies(self.dicom_path, self.followlinks):
             pd = paths.setdefault(study.patient_name_or_uid(), {})
             patient_info = 'patient information\n'
-            patient_info = f'name: {study.patient_name}\n'
+            patient_info += f'name: {study.patient_name}\n'
             patient_info += f'ID: {study.patient_id}\n'
             patient_info += f'birth date: {study.patient_birth_date}\n'
             patient_info += f'sex: {study.patient_sex}\n'
diff --git a/nibabel/filebasedimages.py b/nibabel/filebasedimages.py
index 4fab9451c3..3fd5b5fc8f 100644
--- a/nibabel/filebasedimages.py
+++ b/nibabel/filebasedimages.py
@@ -202,7 +202,7 @@ def __init__(self, header=None, extra=None, file_map=None):
     def header(self):
         return self._header
 
-    def __getitem__(self):
+    def __getitem__(self, key):
         """ No slicing or dictionary interface for images
         """
         raise TypeError("Cannot slice image objects.")
diff --git a/nibabel/pydicom_compat.py b/nibabel/pydicom_compat.py
index 9cca2a293d..b1ee685328 100644
--- a/nibabel/pydicom_compat.py
+++ b/nibabel/pydicom_compat.py
@@ -23,7 +23,6 @@
 # Module has (apparently) unused imports; stop flake8 complaining
 # flake8: noqa
 
-import numpy as np
 from .deprecated import deprecate_with_version
 
 have_dicom = True
diff --git a/nisext/py3builder.py b/nisext/py3builder.py
index 4f82a8cfb2..7bcaf2348c 100644
--- a/nisext/py3builder.py
+++ b/nisext/py3builder.py
@@ -1,9 +1,6 @@
 """ distutils utilities for porting to python 3 within 2-compatible tree """
 
 
-import sys
-import re
-
 try:
     from distutils.command.build_py import build_py_2to3
 except ImportError:
diff --git a/setup.py b/setup.py
index 9c281a032c..29fb3642da 100755
--- a/setup.py
+++ b/setup.py
@@ -10,7 +10,6 @@
 """Build helper."""
 
 import sys
-import os
 
 from setuptools import setup
 import versioneer
diff --git a/tools/make_tarball.py b/tools/make_tarball.py
index 149837aaf5..afbde3d48d 100755
--- a/tools/make_tarball.py
+++ b/tools/make_tarball.py
@@ -4,8 +4,6 @@
 
 import commands
 import os
-import sys
-import shutil
 
 from  toollib import *
 
diff --git a/tools/mpkg_wrapper.py b/tools/mpkg_wrapper.py
index c050bd0f8c..d79f84caad 100644
--- a/tools/mpkg_wrapper.py
+++ b/tools/mpkg_wrapper.py
@@ -16,8 +16,6 @@
 __docformat__ = 'restructuredtext'
 
 import sys
-import setuptools
-import bdist_mpkg
 
 def main():
     del sys.argv[0]