diff --git a/python/taichi/_snode/fields_builder.py b/python/taichi/_snode/fields_builder.py
index 6525aec1178ae6..da576aa8d4b9a2 100644
--- a/python/taichi/_snode/fields_builder.py
+++ b/python/taichi/_snode/fields_builder.py
@@ -76,8 +76,7 @@ def pointer(self, indices: Union[Sequence[_Axis], _Axis],
         """Same as :func:`taichi.lang.snode.SNode.pointer`"""
         if impl.current_cfg().arch == _ti_core.metal:
             raise TaichiRuntimeError(
-                "Pointer SNode on metal backend is deprecated and removed."
-            )
+                "Pointer SNode on metal backend is deprecated and removed.")
         self._check_not_finalized()
         self.empty = False
         return self.root.pointer(indices, dimensions)
@@ -93,8 +92,7 @@ def dynamic(self,
         """Same as :func:`taichi.lang.snode.SNode.dynamic`"""
         if impl.current_cfg().arch == _ti_core.metal:
             raise TaichiRuntimeError(
-                "Dynamic SNode on metal backend is deprecated and removed."
-            )
+                "Dynamic SNode on metal backend is deprecated and removed.")
         self._check_not_finalized()
         self.empty = False
         return self.root.dynamic(index, dimension, chunk_size)
@@ -104,8 +102,7 @@ def bitmasked(self, indices: Union[Sequence[_Axis], _Axis],
         """Same as :func:`taichi.lang.snode.SNode.bitmasked`"""
         if impl.current_cfg().arch == _ti_core.metal:
             raise TaichiRuntimeError(
-                "Bitmasked SNode on metal backend is deprecated and removed."
-            )
+                "Bitmasked SNode on metal backend is deprecated and removed.")
         self._check_not_finalized()
         self.empty = False
         return self.root.bitmasked(indices, dimensions)
diff --git a/python/taichi/lang/snode.py b/python/taichi/lang/snode.py
index 8885a4fd2ec776..15fab24924d80b 100644
--- a/python/taichi/lang/snode.py
+++ b/python/taichi/lang/snode.py
@@ -2,9 +2,9 @@
 
 from taichi._lib import core as _ti_core
 from taichi.lang import expr, impl, matrix
+from taichi.lang.exception import TaichiRuntimeError
 from taichi.lang.field import BitpackedFields, Field
 from taichi.lang.util import get_traceback
-from taichi.lang.exception import TaichiRuntimeError
 
 
 class SNode:
@@ -50,8 +50,7 @@ def pointer(self, axes, dimensions):
         """
         if impl.current_cfg().arch == _ti_core.metal:
             raise TaichiRuntimeError(
-                "Pointer SNode on metal backend is deprecated and removed."
-            )
+                "Pointer SNode on metal backend is deprecated and removed.")
         if isinstance(dimensions, numbers.Number):
             dimensions = [dimensions] * len(axes)
         return SNode(
@@ -81,8 +80,7 @@ def dynamic(self, axis, dimension, chunk_size=None):
         """
         if impl.current_cfg().arch == _ti_core.metal:
             raise TaichiRuntimeError(
-                "Dynamic SNode on metal backend is deprecated and removed."
-            )
+                "Dynamic SNode on metal backend is deprecated and removed.")
         assert len(axis) == 1
         if chunk_size is None:
             chunk_size = dimension
@@ -102,8 +100,7 @@ def bitmasked(self, axes, dimensions):
         """
         if impl.current_cfg().arch == _ti_core.metal:
             raise TaichiRuntimeError(
-                "Bitmasked SNode on metal backend is deprecated and removed."
-            )
+                "Bitmasked SNode on metal backend is deprecated and removed.")
         if isinstance(dimensions, numbers.Number):
             dimensions = [dimensions] * len(axes)
         return SNode(
diff --git a/tests/python/test_deprecation.py b/tests/python/test_deprecation.py
index c4f131de55518d..20d5b43b2d8e25 100644
--- a/tests/python/test_deprecation.py
+++ b/tests/python/test_deprecation.py
@@ -73,27 +73,23 @@ def test_deprecate_element_shape_ndarray_arg():
                      ndim=1,
                      element_shape=(1, ))
 
+
 # Remove this before v1.5.0
 @test_utils.test(arch=ti.metal)
 def test_deprecate_metal_sparse():
     with pytest.raises(
             ti.TaichiRuntimeError,
-            match=
-            "Pointer SNode on metal backend is deprecated and removed."
-    ):
+            match="Pointer SNode on metal backend is deprecated and removed."):
         a = ti.root.pointer(ti.i, 10)
     with pytest.raises(
             ti.TaichiRuntimeError,
-            match=
-            "Bitmasked SNode on metal backend is deprecated and removed."
+            match="Bitmasked SNode on metal backend is deprecated and removed."
     ):
         b = a.bitmasked(ti.j, 10)
 
     with pytest.raises(
             ti.TaichiRuntimeError,
-            match=
-            "Dynamic SNode on metal backend is deprecated and removed."
-    ):
+            match="Dynamic SNode on metal backend is deprecated and removed."):
         ti.root.dynamic(ti.i, 10)