STY: Apply ruff/Perflint rule PERF102

PERF102 When using only the keys of a dict use the `keys()` method
PERF102 When using only the values of a dict use the `values()` method

Author: DimitriPapadopoulos

nibabel/streamlines/tests/test_streamlines.py

@@ -207,7 +207,7 @@ def test_save_tractogram_file(self):
 
     def test_save_empty_file(self):
         tractogram = Tractogram(affine_to_rasmm=np.eye(4))
-        for ext, cls in FORMATS.items():
+        for ext in FORMATS:
             with InTemporaryDirectory():
                 filename = 'streamlines' + ext
                 nib.streamlines.save(tractogram, filename)
@@ -216,7 +216,7 @@ def test_save_empty_file(self):
 
     def test_save_simple_file(self):
         tractogram = Tractogram(DATA['streamlines'], affine_to_rasmm=np.eye(4))
-        for ext, cls in FORMATS.items():
+        for ext in FORMATS:
             with InTemporaryDirectory():
                 filename = 'streamlines' + ext
                 nib.streamlines.save(tractogram, filename)
@@ -262,7 +262,7 @@ def test_save_complex_file(self):
     def test_save_sliced_tractogram(self):
         tractogram = Tractogram(DATA['streamlines'], affine_to_rasmm=np.eye(4))
         original_tractogram = tractogram.copy()
-        for ext, cls in FORMATS.items():
+        for ext in FORMATS:
             with InTemporaryDirectory():
                 filename = 'streamlines' + ext
                 nib.streamlines.save(tractogram[::2], filename)
@@ -283,7 +283,7 @@ def test_save_from_generator(self):
         tractogram = Tractogram(DATA['streamlines'], affine_to_rasmm=np.eye(4))
 
         # Just to create a generator
-        for ext, _ in FORMATS.items():
+        for ext in FORMATS:
             filtered = (s for s in tractogram.streamlines if True)
             lazy_tractogram = LazyTractogram(lambda: filtered, affine_to_rasmm=np.eye(4))
 

nibabel/testing/helpers.py

@@ -14,7 +14,7 @@
 def bytesio_filemap(klass):
     """Return bytes io filemap for this image class `klass`"""
     file_map = klass.make_file_map()
-    for name, fileholder in file_map.items():
+    for fileholder in file_map.values():
         fileholder.fileobj = BytesIO()
         fileholder.pos = 0
     return file_map

nibabel/tests/test_analyze.py

@@ -728,7 +728,7 @@ def test_data_hdr_cache(self):
         IC = self.image_class
         # save an image to a file map
         fm = IC.make_file_map()
-        for key, value in fm.items():
+        for key in fm:
             fm[key].fileobj = BytesIO()
         shape = (2, 3, 4)
         data = np.arange(24, dtype=np.int8).reshape(shape)
@@ -831,7 +831,7 @@ def test_header_updating(self):
         hdr = img.header
         hdr.set_zooms((4, 5, 6))
         # Save / reload using bytes IO objects
-        for key, value in img.file_map.items():
+        for value in img.file_map.values():
             value.fileobj = BytesIO()
         img.to_file_map()
         hdr_back = img.from_file_map(img.file_map).header
@@ -842,7 +842,7 @@ def test_header_updating(self):
         assert_array_equal(hdr.get_zooms(), (2, 3, 4))
         # Modify affine in-place? Update on save.
         img.affine[0, 0] = 9
-        for key, value in img.file_map.items():
+        for value in img.file_map.values():
             value.fileobj = BytesIO()
         img.to_file_map()
         hdr_back = img.from_file_map(img.file_map).header
@@ -864,7 +864,7 @@ def test_pickle(self):
         assert_array_equal(img.get_fdata(), img2.get_fdata())
         assert img.header == img2.header
         # Save / reload using bytes IO objects
-        for key, value in img.file_map.items():
+        for value in img.file_map.values():
             value.fileobj = BytesIO()
         img.to_file_map()
         img_prox = img.from_file_map(img.file_map)

nibabel/tests/test_files_interface.py

@@ -28,7 +28,7 @@ def test_files_spatialimages():
     ]
     for klass in klasses:
         file_map = klass.make_file_map()
-        for key, value in file_map.items():
+        for value in file_map.values():
             assert value.filename is None
             assert value.fileobj is None
             assert value.pos == 0
@@ -41,7 +41,7 @@ def test_files_spatialimages():
             img = klass(arr.astype(np.float32), aff)
         else:
             img = klass(arr, aff)
-        for key, value in img.file_map.items():
+        for value in img.file_map.values():
             assert value.filename is None
             assert value.fileobj is None
             assert value.pos == 0

nibabel/tests/test_nifti1.py

@@ -820,7 +820,7 @@ def _qform_rt(self, img):
         hdr['qform_code'] = 3
         hdr['sform_code'] = 4
         # Save / reload using bytes IO objects
-        for key, value in img.file_map.items():
+        for value in img.file_map.values():
             value.fileobj = BytesIO()
         img.to_file_map()
         return img.from_file_map(img.file_map)

nibabel/tests/test_spm99analyze.py

@@ -423,7 +423,7 @@ def test_mat_read(self):
         aff = np.diag([2, 3, 4, 1])  # no LR flip in affine
         img = img_klass(arr, aff)
         fm = img.file_map
-        for key, value in fm.items():
+        for value in fm.values():
             value.fileobj = BytesIO()
         # Test round trip
         img.to_file_map()
@@ -475,7 +475,7 @@ def test_none_affine(self):
         img = img_klass(np.zeros((2, 3, 4)), None)
         aff = img.header.get_best_affine()
         # Save / reload using bytes IO objects
-        for key, value in img.file_map.items():
+        for value in img.file_map.values():
             value.fileobj = BytesIO()
         img.to_file_map()
         img_back = img.from_file_map(img.file_map)