diff --git a/premise/fuels.py b/premise/fuels.py
index 3b10e3bb..ee989d03 100644
--- a/premise/fuels.py
+++ b/premise/fuels.py
@@ -2251,11 +2251,14 @@ def generate_regional_fuel_market(
         if np.isclose(
             self.iam_fuel_markets.sel(region=region, variables=prod_vars)
             .interp(year=self.year)
-            .sum(dim=["variables"])
-            , 0, atol=1e-3
+            .sum(dim=["variables"]),
+            0,
+            atol=1e-3,
         ):
             if "hydrogen" in dataset["name"].lower():
-                prod_vars = ["hydrogen, from natural gas",]
+                prod_vars = [
+                    "hydrogen, from natural gas",
+                ]
 
         sum_share = 0
         for prod_var in prod_vars:
diff --git a/premise/transformation.py b/premise/transformation.py
index 4277a5a7..6d82e8fa 100644
--- a/premise/transformation.py
+++ b/premise/transformation.py
@@ -492,9 +492,7 @@ def select_multiple_suppliers(
                 suppliers = list(
                     ws.get_many(
                         subset or self.database,
-                        ws.either(
-                            *[ws.equals("name", sup) for sup in possible_names]
-                        ),
+                        ws.either(*[ws.equals("name", sup) for sup in possible_names]),
                         (
                             ws.either(
                                 *[