diff --git a/python/taichi/lang/impl.py b/python/taichi/lang/impl.py
index 520c512f762589..02beaf8a683b59 100644
--- a/python/taichi/lang/impl.py
+++ b/python/taichi/lang/impl.py
@@ -97,7 +97,8 @@ def subscript(value, *indices):
     if is_taichi_class(value):
         return value.subscript(*indices)
     else:
-        if isinstance(indices, tuple) and len(indices) == 1 and indices[0] is None:
+        if isinstance(indices,
+                      tuple) and len(indices) == 1 and indices[0] is None:
             indices = []
         indices_expr_group = make_expr_group(*indices)
         tensor_dim = int(value.ptr.get_attribute("dim"))
diff --git a/taichi/transforms/type_check.cpp b/taichi/transforms/type_check.cpp
index a9fc1b0b34253b..6caec81c8359b4 100644
--- a/taichi/transforms/type_check.cpp
+++ b/taichi/transforms/type_check.cpp
@@ -128,9 +128,12 @@ class TypeCheck : public IRVisitor {
     }
     for (int i = 0; i < stmt->indices.size(); i++) {
       if (!is_integral(stmt->indices[i]->ret_type.data_type)) {
-        TI_WARN("[{}] Tensor accessed with non-integral indices (e.g., "
-                "i32/i64), casting into i32 by default...", stmt->name());
-        stmt->indices[i] = insert_type_cast_before(stmt, stmt->indices[i], DataType::i32);
+        TI_WARN(
+            "[{}] Tensor accessed with non-integral indices (e.g., "
+            "i32/i64), casting into i32 by default...",
+            stmt->name());
+        stmt->indices[i] =
+            insert_type_cast_before(stmt, stmt->indices[i], DataType::i32);
       }
       TI_ASSERT(stmt->indices[i]->ret_type.width == stmt->snodes.size());
     }
diff --git a/tests/python/test_indices.py b/tests/python/test_indices.py
index d2e7cd9e7ecb73..44afff73181f00 100644
--- a/tests/python/test_indices.py
+++ b/tests/python/test_indices.py
@@ -21,7 +21,6 @@ def test_indices():
     # the virtual first index exposed to the user comes second in memory layout.
 
 
-
 @ti.host_arch_only
 def test_float_as_index():
     a = ti.var(ti.f32, (8, 5))
@@ -37,5 +36,5 @@ def func():
 
     func()
 
-    assert a[6, 3] == 233 
+    assert a[6, 3] == 233
     assert a[3, 4] == 666