diff --git a/python/dune/perftool/pdelab/driver/gridoperator.py b/python/dune/perftool/pdelab/driver/gridoperator.py
index 76eb23f91f529a752d0fcdd600fe71087516d311..b701cecac9969eb5b5944e5b7fbb790da8092c62 100644
--- a/python/dune/perftool/pdelab/driver/gridoperator.py
+++ b/python/dune/perftool/pdelab/driver/gridoperator.py
@@ -109,6 +109,7 @@ def update_gfs(gfs):
     return ["// Update the GFS to trigger GFS initialization",
             "{}.update();".format(gfs)]
 
+
 @preamble
 def define_dofestimate(name):
     # Provide a worstcase estimate for the number of entries per row based
@@ -117,7 +118,7 @@ def define_dofestimate(name):
         geo_factor = 2**get_dimension()
     else:
         if get_dimension() < 3:
-            geo_factor = 3*get_dimension()
+            geo_factor = 3 * get_dimension()
         else:
             # TODO no idea how a generic estimate for 3D simplices looks like
             geo_factor = 12
diff --git a/python/dune/perftool/pdelab/driver/instationary.py b/python/dune/perftool/pdelab/driver/instationary.py
index 723bcfce36937f07621293c3d4e14c834fc778f5..9ab49c9cc35e961d0efea5bb0cafc6d34ef94105 100644
--- a/python/dune/perftool/pdelab/driver/instationary.py
+++ b/python/dune/perftool/pdelab/driver/instationary.py
@@ -116,7 +116,6 @@ def name_time():
     return "time"
 
 
-
 @preamble
 def typedef_timesteppingmethod(name):
     r_type = type_range()
diff --git a/python/dune/perftool/pdelab/driver/solve.py b/python/dune/perftool/pdelab/driver/solve.py
index 5abbac27c46deb00169f3787b9283c93db9f94a6..59ef32eb39dfa4cd0b49ecbb61a84d30612a0683 100644
--- a/python/dune/perftool/pdelab/driver/solve.py
+++ b/python/dune/perftool/pdelab/driver/solve.py
@@ -101,7 +101,6 @@ def define_vector(name, formdata):
     return ["{} {}({});".format(vtype, name, gfs), "{} = 0.0;".format(name)]
 
 
-
 @preamble
 def typedef_linearsolver(name):
     include_file("dune/pdelab/backend/istl.hh", filetag="driver")
diff --git a/python/dune/perftool/pdelab/driver/timings.py b/python/dune/perftool/pdelab/driver/timings.py
index 6767a1b03019e349c92226f385556d9d591fe30b..58345d92a95b71d394b07e08f7b44404b8b43f86 100644
--- a/python/dune/perftool/pdelab/driver/timings.py
+++ b/python/dune/perftool/pdelab/driver/timings.py
@@ -41,6 +41,7 @@ def dump_dof_numbers(stream):
                                                                            ident,
                                                                            name_trial_gfs())
 
+
 @preamble
 def define_timing_stream(name):
     include_file('fstream', filetag='driver', system=True)
diff --git a/python/dune/perftool/pdelab/driver/vtk.py b/python/dune/perftool/pdelab/driver/vtk.py
index 71783adcf3b93909aa886c36512df9226373d738..276570de5032de573f97e12b8fc631e1b8e1c791 100644
--- a/python/dune/perftool/pdelab/driver/vtk.py
+++ b/python/dune/perftool/pdelab/driver/vtk.py
@@ -92,7 +92,6 @@ def name_predicate():
     return "predicate"
 
 
-
 @preamble
 def typedef_vtk_sequence_writer(name):
     include_file("dune/grid/io/file/vtk/vtksequencewriter.hh", filetag="driver")
@@ -154,4 +153,4 @@ def _define_gfs_name(element, is_dirichlet, offset):
 
 def define_gfs_names(element):
     is_dirichlet = preprocess_leaf_data(element, "is_dirichlet")
-    return _define_gfs_name(element, is_dirichlet, 0)
\ No newline at end of file
+    return _define_gfs_name(element, is_dirichlet, 0)