diff --git a/flopy/export/utils.py b/flopy/export/utils.py
index 605c2c9a56..83156033bd 100644
--- a/flopy/export/utils.py
+++ b/flopy/export/utils.py
@@ -402,8 +402,9 @@ def output_helper(
         elif verbose:
             print(msg)
     times = [t for t in common_times[::stride]]
-    if (isinstance(f, str) or isinstance(f, Path)) and 
-        Path(f).suffix.lower() == ".nc":
+    if (isinstance(f, str) or isinstance(f, Path)) and Path(
+        f
+    ).suffix.lower() == ".nc":
         f = NetCdf(
             f, ml, time_values=times, logger=logger, forgive=forgive, **kwargs
         )
@@ -612,8 +613,9 @@ def model_export(
     if package_names is None:
         package_names = [pak.name[0] for pak in ml.packagelist]
 
-    if (isinstance(f, str) or isinstance(f, Path)) and 
-        Path(f).suffix.lower() == ".nc":
+    if (isinstance(f, str) or isinstance(f, Path)) and Path(
+        f
+    ).suffix.lower() == ".nc":
         f = NetCdf(f, ml, **kwargs)
 
     if (isinstance(f, str) or isinstance(f, Path)) and Path(
@@ -705,8 +707,9 @@ def package_export(
     """
     assert isinstance(pak, PackageInterface)
 
-    if (isinstance(f, str) or isinstance(f, Path)) and 
-        Path(f).suffix.lower() == ".nc":
+    if (isinstance(f, str) or isinstance(f, Path)) and Path(
+        f
+    ).suffix.lower() == ".nc":
         f = NetCdf(f, pak.parent, **kwargs)
 
     if (isinstance(f, str) or isinstance(f, Path)) and Path(
@@ -818,8 +821,9 @@ def generic_array_export(
             flopy model object
 
     """
-    if (isinstance(f, str) or isinstance(f, Path)) and 
-        Path(f).suffix.lower() == ".nc":
+    if (isinstance(f, str) or isinstance(f, Path)) and Path(
+        f
+    ).suffix.lower() == ".nc":
         assert "model" in kwargs.keys(), (
             "creating a new netCDF using generic_array_helper requires a "
             "'model' kwarg"
@@ -906,8 +910,9 @@ def mflist_export(f: Union[str, os.PathLike, NetCdf], mfl, **kwargs):
     if "modelgrid" in kwargs:
         modelgrid = kwargs.pop("modelgrid")
 
-    if (isinstance(f, str) or isinstance(f, Path)) and 
-        Path(f).suffix.lower() == ".nc":
+    if (isinstance(f, str) or isinstance(f, Path)) and Path(
+        f
+    ).suffix.lower() == ".nc":
         f = NetCdf(f, mfl.model, **kwargs)
 
     if (isinstance(f, str) or isinstance(f, Path)) and Path(
@@ -1062,8 +1067,9 @@ def transient2d_export(f: Union[str, os.PathLike], t2d, fmt=None, **kwargs):
     if "modelgrid" in kwargs:
         modelgrid = kwargs.pop("modelgrid")
 
-    if (isinstance(f, str) or isinstance(f, Path)) and 
-        Path(f).suffix.lower() == ".nc":
+    if (isinstance(f, str) or isinstance(f, Path)) and Path(
+        f
+    ).suffix.lower() == ".nc":
         f = NetCdf(f, t2d.model, **kwargs)
 
     if (isinstance(f, str) or isinstance(f, Path)) and Path(
@@ -1218,8 +1224,9 @@ def array3d_export(f: Union[str, os.PathLike], u3d, fmt=None, **kwargs):
     if "modelgrid" in kwargs:
         modelgrid = kwargs.pop("modelgrid")
 
-    if (isinstance(f, str) or isinstance(f, Path)) and 
-        Path(f).suffix.lower() == ".nc":
+    if (isinstance(f, str) or isinstance(f, Path)) and Path(
+        f
+    ).suffix.lower() == ".nc":
         f = NetCdf(f, u3d.model, **kwargs)
 
     if (isinstance(f, str) or isinstance(f, Path)) and Path(
@@ -1395,8 +1402,9 @@ def array2d_export(
     if "modelgrid" in kwargs:
         modelgrid = kwargs.pop("modelgrid")
 
-    if (isinstance(f, str) or isinstance(f, Path)) and 
-        Path(f).suffix.lower() == ".nc":
+    if (isinstance(f, str) or isinstance(f, Path)) and Path(
+        f
+    ).suffix.lower() == ".nc":
         f = NetCdf(f, u2d.model, **kwargs)
 
     if (isinstance(f, str) or isinstance(f, Path)) and Path(
@@ -1408,8 +1416,9 @@ def array2d_export(
         )
         return
 
-    elif (isinstance(f, str) or isinstance(f, Path)) and 
-        Path(f).suffix.lower() == ".asc":
+    elif (isinstance(f, str) or isinstance(f, Path)) and Path(
+        f
+    ).suffix.lower() == ".asc":
         export_array(modelgrid, f, u2d.array, **kwargs)
         return