diff --git a/scripts/build_transport_demand.py b/scripts/build_transport_demand.py
index a9ac9e22..2954a999 100644
--- a/scripts/build_transport_demand.py
+++ b/scripts/build_transport_demand.py
@@ -23,13 +23,11 @@ from _helpers import (
 logger = logging.getLogger(__name__)
 
 
-
 def build_nodal_transport_data(fn, pop_layout, year):
     # get numbers of car and fuel efficiency per country
     transport_data = pd.read_csv(fn, index_col=[0, 1])
     transport_data = transport_data.xs(min(2015, year), level="year")
 
-
     # break number of cars down to nodal level based on population density
     nodal_transport_data = transport_data.loc[pop_layout.ct].fillna(0.0)
     nodal_transport_data.index = pop_layout.index
diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
index 970d6e9d..53355b27 100755
--- a/scripts/prepare_sector_network.py
+++ b/scripts/prepare_sector_network.py
@@ -23,15 +23,13 @@ from _helpers import (
     update_config_from_wildcards,
 )
 from add_electricity import calculate_annuity, sanitize_carriers, sanitize_locations
-
-from build_transport_demand import transport_degree_factor
-
 from build_energy_totals import (
     build_co2_totals,
     build_eea_co2,
     build_eurostat,
     build_eurostat_co2,
 )
+from build_transport_demand import transport_degree_factor
 from networkx.algorithms import complement
 from networkx.algorithms.connectivity.edge_augmentation import k_edge_augmentation
 from prepare_network import maybe_adjust_costs_and_potentials