diff --git a/python/dune/perftool/generation/backend.py b/python/dune/perftool/generation/backend.py
index d491e1d8b0492e9ac3d744fbf298baa3e761d27c..5446fabd91eef32dda25957cfd2a7d9a93e3cb02 100644
--- a/python/dune/perftool/generation/backend.py
+++ b/python/dune/perftool/generation/backend.py
@@ -30,10 +30,11 @@ def backend(interface=None, name=None):
 
     return _dec
 
+
 def get_backend(interface=None, selector=None, **kwargs):
     assert interface and selector
 
     select = selector(**kwargs)
     assert select in _backend_mapping[interface]
 
-    return _backend_mapping[interface][select]
\ No newline at end of file
+    return _backend_mapping[interface][select]
diff --git a/python/dune/perftool/generation/loopy.py b/python/dune/perftool/generation/loopy.py
index 2b95668fc6db5cd5b8d2be57f14adc5ac40322f9..f62f309c069b3cbec2ca3a9ebce6f13cd7653646 100644
--- a/python/dune/perftool/generation/loopy.py
+++ b/python/dune/perftool/generation/loopy.py
@@ -200,4 +200,4 @@ def instruction(code=None, expression=None, **kwargs):
 
 @generator_factory(item_tags=("instruction",), cache_key_generator=lambda **kw: kw['id'])
 def noop_instruction(**kwargs):
-    return loopy.NoOpInstruction(**kwargs)
\ No newline at end of file
+    return loopy.NoOpInstruction(**kwargs)
diff --git a/python/dune/perftool/loopy/stages.py b/python/dune/perftool/loopy/stages.py
index a0a2b2c48fc9c26e84aa329a8adf63bbd8903c66..d8ff325a95aed044c043aecd722cef3b97aa4f4f 100644
--- a/python/dune/perftool/loopy/stages.py
+++ b/python/dune/perftool/loopy/stages.py
@@ -29,6 +29,6 @@ def finalize_stage_instructions(kernel):
     for i in range(len(stage_insn._memoize_cache)):
         deps = frozenset({insn.id for insn in kernel.instructions if stage_insn(i) in insn.depends_on and not insn.id.startswith('stage_insn_')})
         for dep_id in deps:
-            kernel = add_dependency(kernel, Id(stage_insn(i+1)), dep_id)
+            kernel = add_dependency(kernel, Id(stage_insn(i + 1)), dep_id)
 
-    return kernel
\ No newline at end of file
+    return kernel
diff --git a/python/dune/perftool/sumfact/sumfact.py b/python/dune/perftool/sumfact/sumfact.py
index 1753589c2bb8d2c5ce0d625ee4297f73fe53d1fc..a7ee0a042c1fab3ac5b3662877c5a4b3a841f8a4 100644
--- a/python/dune/perftool/sumfact/sumfact.py
+++ b/python/dune/perftool/sumfact/sumfact.py
@@ -11,11 +11,11 @@ from dune.perftool.loopy.buffer import (get_buffer_temporary,
                                         )
 from dune.perftool.pdelab.spaces import name_lfs
 from dune.perftool.sumfact.amatrix import (AMatrix,
-                                               quadrature_points_per_direction,
-                                               basis_functions_per_direction,
-                                               name_theta,
-                                               name_theta_transposed,
-                                               )
+                                           quadrature_points_per_direction,
+                                           basis_functions_per_direction,
+                                           name_theta,
+                                           name_theta_transposed,
+                                           )
 from dune.perftool.loopy.stages import stage_insn
 from pymbolic.primitives import (Call,
                                  Product,