diff --git a/autotest/test_particledata.py b/autotest/test_particledata.py
index f647a1de3..8840ef42d 100644
--- a/autotest/test_particledata.py
+++ b/autotest/test_particledata.py
@@ -309,7 +309,9 @@ def test_particledata_to_prp_disv_9():
 def test_lrcparticledata_to_prp_divisions_defaults():
     sd_data = CellDataType()
     regions = [[0, 0, 1, 0, 1, 1]]
-    part_data = LRCParticleData(subdivisiondata=[sd_data], lrcregions=[regions])
+    part_data = LRCParticleData(
+        subdivisiondata=[sd_data], lrcregions=[regions]
+    )
     grid = GridCases().structured_small()
     rpts_prt = flatten(list(part_data.to_prp(grid)))
     rpts_exp = [
diff --git a/flopy/modpath/mp7particledata.py b/flopy/modpath/mp7particledata.py
index aa4e5e5c6..44c7fe0cc 100644
--- a/flopy/modpath/mp7particledata.py
+++ b/flopy/modpath/mp7particledata.py
@@ -1109,7 +1109,9 @@ def to_coords(self, grid) -> Iterator[tuple]:
                     for i in range(mini, maxi + 1):
                         for j in range(minj, maxj + 1):
                             for sd in self.subdivisiondata:
-                                for rpt in get_release_points(sd, grid, k, i, j):
+                                for rpt in get_release_points(
+                                    sd, grid, k, i, j
+                                ):
                                     yield (rpt[3], rpt[4], rpt[5])
 
     def to_prp(self, grid) -> Iterator[tuple]:
@@ -1143,7 +1145,9 @@ def to_prp(self, grid) -> Iterator[tuple]:
                     for i in range(mini, maxi + 1):
                         for j in range(minj, maxj + 1):
                             for sd in self.subdivisiondata:
-                                for irpt, rpt in enumerate(get_release_points(sd, grid, k, i, j)):
+                                for irpt, rpt in enumerate(
+                                    get_release_points(sd, grid, k, i, j)
+                                ):
                                     assert rpt[0] == k
                                     assert rpt[1] == i
                                     assert rpt[2] == j