diff --git a/nibabel/tests/test_nifti1.py b/nibabel/tests/test_nifti1.py
index e7b226187..b54a336ea 100644
--- a/nibabel/tests/test_nifti1.py
+++ b/nibabel/tests/test_nifti1.py
@@ -538,8 +538,7 @@ def test_slice_times(self):
         hdr.set_slice_duration(0.1)
         # We need a function to print out the Nones and floating point
         # values in a predictable way, for the tests below.
-        _stringer = lambda val: (val is not None and f'{val:2.1f}') or None
-        _print_me = lambda s: list(map(_stringer, s))
+        _print_me = lambda s: [val if val is None else f'{val:2.1f}' for val in s]
         # The following examples are from the nifti1.h documentation.
         hdr['slice_code'] = slice_order_codes['sequential increasing']
         assert _print_me(hdr.get_slice_times()) == [
diff --git a/nibabel/tests/test_volumeutils.py b/nibabel/tests/test_volumeutils.py
index 4eb6b1d64..86923cc9f 100644
--- a/nibabel/tests/test_volumeutils.py
+++ b/nibabel/tests/test_volumeutils.py
@@ -607,11 +607,7 @@ def test_a2f_nanpos():
 
 def test_a2f_bad_scaling():
     # Test that pathological scalers raise an error
-    NUMERICAL_TYPES = [
-        x
-        for sublist in (sctypes[key] for key in ('int', 'uint', 'float', 'complex'))
-        for x in sublist
-    ]
+    NUMERICAL_TYPES = [tp for kind in ('int', 'uint', 'float', 'complex') for tp in sctypes[kind]]
     for in_type, out_type, slope, inter in itertools.product(
         NUMERICAL_TYPES,
         NUMERICAL_TYPES,
diff --git a/nibabel/volumeutils.py b/nibabel/volumeutils.py
index 67a3f9a58..992c16924 100644
--- a/nibabel/volumeutils.py
+++ b/nibabel/volumeutils.py
@@ -35,8 +35,7 @@
     DT = ty.TypeVar('DT', bound=np.generic)
 
 sys_is_le = sys.byteorder == 'little'
-native_code = (sys_is_le and '<') or '>'
-swapped_code = (sys_is_le and '>') or '<'
+native_code, swapped_code = ('<', '>') if sys_is_le else ('>', '<')
 
 _endian_codes = (  # numpy code, aliases
     ('<', 'little', 'l', 'le', 'L', 'LE'),