Adjusts to pep8

python/dune/perftool/blockstructured/basis.py

@@ -108,4 +108,4 @@ def pymbolic_reference_gradient(leaf_element, restriction, number, context=''):
     evaluate_reference_gradient(leaf_element, name, restriction)
     iname = lfs_inames(leaf_element, restriction, number, context=context)[0]
 
-    return prim.Subscript(prim.Variable(name), (prim.Variable(iname), 0))
\ No newline at end of file
+    return prim.Subscript(prim.Variable(name), (prim.Variable(iname), 0))