From f0d32a01deaa28d649d6baca68a770f648aceef8 Mon Sep 17 00:00:00 2001
From: "Christopher J. Markiewicz" <markiewicz@stanford.edu>
Date: Thu, 18 Sep 2025 16:48:04 -0400
Subject: [PATCH 1/2] sty: Apply ruff fix for looped file.write

file.writelines() does not add newlines. I have also checked the source
code and it iterates over whatever is passed, so there should be no
impact on memory usage.
---
 nibabel/cmdline/parrec2nii.py | 9 +++------
 nibabel/volumeutils.py        | 3 +--
 pyproject.toml                | 1 -
 3 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/nibabel/cmdline/parrec2nii.py b/nibabel/cmdline/parrec2nii.py
index 0ae6b3fb4..a64d0fa1c 100644
--- a/nibabel/cmdline/parrec2nii.py
+++ b/nibabel/cmdline/parrec2nii.py
@@ -358,8 +358,7 @@ def proc_file(infile, opts):
             )
             with open(basefilename + '.bvals', 'w') as fid:
                 # np.savetxt could do this, but it's just a loop anyway
-                for val in bvals:
-                    fid.write(f'{val} ')
+                fid.writelines(f'{val} ' for val in bvals)
                 fid.write('\n')
         else:
             verbose('Writing .bvals and .bvecs files')
@@ -369,13 +368,11 @@ def proc_file(infile, opts):
             bvecs = apply_affine(bv_reorient, bvecs)
             with open(basefilename + '.bvals', 'w') as fid:
                 # np.savetxt could do this, but it's just a loop anyway
-                for val in bvals:
-                    fid.write(f'{val} ')
+                fid.writelines(f'{val} ' for val in bvals)
                 fid.write('\n')
             with open(basefilename + '.bvecs', 'w') as fid:
                 for row in bvecs.T:
-                    for val in row:
-                        fid.write(f'{val} ')
+                    fid.writelines(f'{val} ' for val in row)
                     fid.write('\n')
 
     # export data labels varying along the 4th dimensions if requested
diff --git a/nibabel/volumeutils.py b/nibabel/volumeutils.py
index 41bff7275..24b3b935e 100644
--- a/nibabel/volumeutils.py
+++ b/nibabel/volumeutils.py
@@ -830,8 +830,7 @@ def write_zeros(fileobj: io.IOBase, count: int, block_size: int = 8194) -> None:
     nblocks = int(count // block_size)
     rem = count % block_size
     blk = b'\x00' * block_size
-    for bno in range(nblocks):
-        fileobj.write(blk)
+    fileobj.writelines(blk for bno in range(nblocks))
     fileobj.write(b'\x00' * rem)
 
 
diff --git a/pyproject.toml b/pyproject.toml
index c66902aef..5cd8fe9ba 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -164,7 +164,6 @@ ignore = [
     "RUF012", # TODO: enable
     "RUF015",
     "RUF017", # TODO: enable
-    "UP038",  # https://github.com/astral-sh/ruff/issues/7871
     # https://docs.astral.sh/ruff/formatter/#conflicting-lint-rules
     "W191",
     "E111",

From f3ec45a59437f20f30fb063cc3aead0eba0f0f73 Mon Sep 17 00:00:00 2001
From: "Christopher J. Markiewicz" <markiewicz@stanford.edu>
Date: Thu, 18 Sep 2025 21:47:21 -0400
Subject: [PATCH 2/2] fix: Add writelines proxy method

---
 nibabel/openers.py     | 5 ++++-
 nibabel/volumeutils.py | 4 ++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/nibabel/openers.py b/nibabel/openers.py
index 2d95d4813..3ad9b6c22 100644
--- a/nibabel/openers.py
+++ b/nibabel/openers.py
@@ -21,7 +21,7 @@
 if ty.TYPE_CHECKING:
     from types import TracebackType
 
-    from _typeshed import WriteableBuffer
+    from _typeshed import ReadableBuffer, WriteableBuffer
 
     from ._typing import Self
 
@@ -231,6 +231,9 @@ def readinto(self, buffer: WriteableBuffer, /) -> int | None:
     def write(self, b: bytes, /) -> int | None:
         return self.fobj.write(b)
 
+    def writelines(self, lines: ty.Iterable[ReadableBuffer], /) -> None:
+        self.fobj.writelines(lines)
+
     def seek(self, pos: int, whence: int = 0, /) -> int:
         return self.fobj.seek(pos, whence)
 
diff --git a/nibabel/volumeutils.py b/nibabel/volumeutils.py
index 24b3b935e..10fb60ed0 100644
--- a/nibabel/volumeutils.py
+++ b/nibabel/volumeutils.py
@@ -1364,7 +1364,7 @@ def shape_zoom_affine(
     return aff
 
 
-def rec2dict(rec: np.ndarray) -> dict[str, np.generic | np.ndarray]:
+def rec2dict(rec: np.record) -> dict[str, np.generic | np.ndarray]:
     """Convert recarray to dictionary
 
     Also converts scalar values to scalars
@@ -1387,7 +1387,7 @@ def rec2dict(rec: np.ndarray) -> dict[str, np.generic | np.ndarray]:
     True
     """
     dct = {}
-    for key in rec.dtype.fields:
+    for key in rec.dtype.fields or ():
         val = rec[key]
         try:
             val = val.item()