diff --git a/premise/external.py b/premise/external.py
index 6c0fd81c..d614b989 100644
--- a/premise/external.py
+++ b/premise/external.py
@@ -805,9 +805,11 @@ def check_existence_of_market_suppliers(self):
                                     # )
 
                                     suppliers = [
-                                        s for s in self.database
+                                        s
+                                        for s in self.database
                                         if s["name"].lower() == name.lower()
-                                        and s["reference product"].lower() == ref_prod.lower()
+                                        and s["reference product"].lower()
+                                        == ref_prod.lower()
                                         and s["location"] == possible_locations[counter]
                                     ]
 
@@ -884,7 +886,8 @@ def fetch_potential_suppliers(
                 # )
 
                 act = [
-                    a for a in self.database
+                    a
+                    for a in self.database
                     if a["name"].lower() == name.lower()
                     and a["reference product"].lower() == ref_prod.lower()
                     and a["location"] == possible_locations[counter]
diff --git a/premise/external_data_validation.py b/premise/external_data_validation.py
index b645761b..a4fc49ae 100644
--- a/premise/external_data_validation.py
+++ b/premise/external_data_validation.py
@@ -343,7 +343,8 @@ def check_inventories(
             for i, v in d_datasets.items()
             if not v["exists in original database"]
             and not v.get("new dataset")
-            and (i[0].lower(), i[1].lower()) in [(x[0].lower(), x[1].lower()) for x in list_datasets]
+            and (i[0].lower(), i[1].lower())
+            in [(x[0].lower(), x[1].lower()) for x in list_datasets]
         ]
 
         raise AssertionError(
diff --git a/premise/fuels.py b/premise/fuels.py
index 52bfe73c..22d4a169 100644
--- a/premise/fuels.py
+++ b/premise/fuels.py
@@ -611,8 +611,12 @@ def generate_hydrogen_activities(self) -> None:
                                 exc["amount"] *= scaling_factor
                                 exc["uncertainty type"] = 5
                                 exc["loc"] = exc["amount"]
-                                exc["minimum"] = exc["amount"] * (min_energy_use / new_energy_use)
-                                exc["maximum"] = exc["amount"] * (max_energy_use / new_energy_use)
+                                exc["minimum"] = exc["amount"] * (
+                                    min_energy_use / new_energy_use
+                                )
+                                exc["maximum"] = exc["amount"] * (
+                                    max_energy_use / new_energy_use
+                                )
 
                         else:
                             # rescale the fuel consumption exchange