diff --git a/python/dune/perftool/loopy/buffer.py b/python/dune/perftool/loopy/buffer.py
index d7e6c97af201b6adda99ea84e3a7d66238354e6f..4f5832669bd876c3601a1ffb90294f32b4efff6a 100644
--- a/python/dune/perftool/loopy/buffer.py
+++ b/python/dune/perftool/loopy/buffer.py
@@ -39,7 +39,7 @@ class FlipFlopBuffer(object):
         dim = formdata.geometric_dimension
 
         # TODO: doc!
-        storage_shape = (self.base_storage_size,) + (1,)*(dim-1)
+        storage_shape = (self.base_storage_size,) + (1,) * (dim - 1)
 
         # Construct the temporary and return it
         temporary_variable(name,
diff --git a/python/dune/perftool/pdelab/localoperator.py b/python/dune/perftool/pdelab/localoperator.py
index e13ab5288c1391e25c42cfd8d7185bc9f02e0106..80b81e9b8fdd8ea42886179046097478246c0e9c 100644
--- a/python/dune/perftool/pdelab/localoperator.py
+++ b/python/dune/perftool/pdelab/localoperator.py
@@ -604,8 +604,8 @@ class LoopyKernelMethod(ClassMember):
         if initializer_list:
             content[-1] = content[-1] + " :"
             for init in initializer_list[:-1]:
-                content.append(" "*4 + init + ",")
-            content.append(" "*4 + initializer_list[-1])
+                content.append(" " * 4 + init + ",")
+            content.append(" " * 4 + initializer_list[-1])
 
         content.append('{')
         if kernel is not None:
diff --git a/python/dune/perftool/sumfact/basis.py b/python/dune/perftool/sumfact/basis.py
index 03665d473a4b97416d5f61ea83156138fc11fed3..8005716a0accd0506033f348e47153dd0bf47758 100644
--- a/python/dune/perftool/sumfact/basis.py
+++ b/python/dune/perftool/sumfact/basis.py
@@ -122,7 +122,7 @@ def pymbolic_trialfunction(element, restriction, component):
     rows = quadrature_points_per_direction()
     cols = basis_functions_per_direction()
     a_matrix = AMatrix(theta, rows, cols)
-    a_matrices = (a_matrix,)*dim
+    a_matrices = (a_matrix,) * dim
 
     # Flip flop buffers for sumfactorization
     buffer_name = name_sumfact_base_buffer()
diff --git a/python/dune/perftool/sumfact/sumfact.py b/python/dune/perftool/sumfact/sumfact.py
index 04a18a7bdb24980a22d9a6079b19c1589f00a4c4..a6991a862510b5bb52026345eefe6ff53de90571 100644
--- a/python/dune/perftool/sumfact/sumfact.py
+++ b/python/dune/perftool/sumfact/sumfact.py
@@ -135,14 +135,14 @@ def generate_accumulation_instruction(visitor, accterm, measure, subdomain_id):
             a_matrices = tuple(a_matrices)
 
         else:
-            a_matrices = (theta_matrix,)*dim
+            a_matrices = (theta_matrix,) * dim
 
         # Initialize a base storage for this buffer and get a temporay pointing to it
         temp = initialize_buffer(buf,
                                  base_storage_size=product(max(mat.rows, mat.cols) for mat in a_matrices),
                                  num=2
                                  ).get_temporary(shape=(quadrature_points_per_direction(),) * dim,
-                                                 dim_tags=",".join(['f']*dim))
+                                                 dim_tags=",".join(['f'] * dim))
 
         # Replace gradient iname with correct index for assignement
         replace_dict = {}
@@ -280,7 +280,7 @@ def sum_factorization_kernel(a_matrices, buf, insn_dep=frozenset({}), additional
     dim = formdata.geometric_dimension
 
     out_shape = tuple(mat.rows for mat in a_matrices)
-    dim_tags = ",".join(['f']*dim)
+    dim_tags = ",".join(['f'] * dim)
     out = get_buffer_temporary(buf,
                                shape=out_shape,
                                dim_tags=dim_tags)