diff --git a/plasmapy/classes/sources/openpmd_hdf5.py b/plasmapy/classes/sources/openpmd_hdf5.py
index 802a4d1a5f..68819adb60 100644
--- a/plasmapy/classes/sources/openpmd_hdf5.py
+++ b/plasmapy/classes/sources/openpmd_hdf5.py
@@ -76,7 +76,6 @@ def __init__(self, hdf5, **kwargs):
 
         self.subname = tuple(self.h5['data'])[0]
 
-
     def _check_valid_openpmd_version(self):
         try:
             openPMD_version = self.h5.attrs["openPMD"].decode('utf-8')
@@ -117,7 +116,7 @@ def charge_density(self):
 
     @classmethod
     def is_datasource_for(cls, **kwargs):
-        if not "hdf5" in kwargs:
+        if "hdf5" not in kwargs:
             return False
 
         hdf5 = kwargs.get("hdf5")
@@ -127,7 +126,7 @@ def is_datasource_for(cls, **kwargs):
         if not isfile:
             raise FileNotFoundError(f"Could not find file: '{hdf5}'")
 
-        if not "openPMD" in kwargs and isfile:
+        if "openPMD" not in kwargs and isfile:
             h5 = h5py.File(hdf5)
             try:
                 openPMD = h5.attrs["openPMD"]
diff --git a/plasmapy/classes/sources/tests/test_openpmd_hdf5.py b/plasmapy/classes/sources/tests/test_openpmd_hdf5.py
index 3a16d11a02..44f05d07eb 100644
--- a/plasmapy/classes/sources/tests/test_openpmd_hdf5.py
+++ b/plasmapy/classes/sources/tests/test_openpmd_hdf5.py
@@ -49,7 +49,7 @@ def test_correct_shape_charge_density(self):
 
 
 units_test_table = [
-    ((1., 1., 0., -1., 0. ,0., 2.),
+    ((1., 1., 0., -1., 0., 0., 2.),
      u.m * u.kg / u.amp * u.cd ** 2),
     ((1, 0, 1, 2, 0, 0, 0),
      u.m * u.s * u.amp ** 2),
@@ -58,6 +58,8 @@ def test_correct_shape_charge_density(self):
     ([2, 1, -3, -2, 0, 0, 0],
      u.ohm)
 ]
+
+
 @pytest.mark.parametrize("openPMD_dims, expected", units_test_table)
 def test_fetch_units(openPMD_dims, expected: Union[Tuple, List]):
     units = openpmd_hdf5._fetch_units(openPMD_dims)
diff --git a/plasmapy/data/test/__init__.py b/plasmapy/data/test/__init__.py
index d766397278..e99f623c32 100644
--- a/plasmapy/data/test/__init__.py
+++ b/plasmapy/data/test/__init__.py
@@ -1,10 +1,7 @@
-from pathlib import Path
 import os
 import glob
 
 import plasmapy
 
-rootdir = Path(os.path.join(os.path.dirname(plasmapy.__file__),
-                            "data",
-                            "test"))
+rootdir = os.path.join(os.path.dirname(plasmapy.__file__), "data", "test"))
 file_list = glob.glob(os.path.join(rootdir, '*.[!p]*'))