diff --git a/unfold/data_cleaning.py b/unfold/data_cleaning.py
index 15d0d66..e7b122f 100644
--- a/unfold/data_cleaning.py
+++ b/unfold/data_cleaning.py
@@ -200,7 +200,7 @@ def check_for_duplicates(db: List[dict], data: List[dict]) -> List[dict]:
         (x["name"].lower(), x["reference product"].lower(), x["location"])
         for x in data
         if (x["name"].lower(), x["reference product"].lower(), x["location"])
-           in db_names
+        in db_names
     ]
 
     if len(already_exist) > 0:
@@ -328,9 +328,9 @@ def correct_fields_format(data: list, name: str) -> list:
                 dataset["parameters"] = [dataset["parameters"]]
 
             if (
-                    dataset["parameters"] is None
-                    or dataset["parameters"] == {}
-                    or dataset["parameters"] == []
+                dataset["parameters"] is None
+                or dataset["parameters"] == {}
+                or dataset["parameters"] == []
             ):
                 del dataset["parameters"]
 
@@ -377,8 +377,8 @@ def check_mandatory_fields(data: list) -> list:
         for field in dataset_fields:
             if field not in dataset:
                 if (
-                        field in ["reference product", "location", "unit", "name"]
-                        and "exchanges" in dataset
+                    field in ["reference product", "location", "unit", "name"]
+                    and "exchanges" in dataset
                 ):
                     for exc in dataset["exchanges"]:
                         if exc["type"] == "production":
diff --git a/unfold/fold.py b/unfold/fold.py
index 7403dfd..da854ef 100644
--- a/unfold/fold.py
+++ b/unfold/fold.py
@@ -21,10 +21,10 @@
 from . import __version__
 from .data_cleaning import (
     DATA_DIR,
+    check_commonality_between_databases,
     check_mandatory_fields,
     get_biosphere_code,
     get_outdated_flows,
-    check_commonality_between_databases,
 )
 
 DIR_DATAPACKAGE_TEMP = DATA_DIR / "temp"
diff --git a/unfold/unfold.py b/unfold/unfold.py
index ed384aa..0f5561d 100644
--- a/unfold/unfold.py
+++ b/unfold/unfold.py
@@ -627,7 +627,6 @@ def build_superstructure_database(self, matrix: np.ndarray) -> list:
     def build_single_databases(
         self, matrix, databases_to_build: List[dict]
     ) -> list[list[dict]]:
-
         """
         Generate a list of single databases for each scenario specified in `databases_to_build`.