diff --git a/pvlib/shading.py b/pvlib/shading.py
index 5efadcd718..5cf7eedb67 100644
--- a/pvlib/shading.py
+++ b/pvlib/shading.py
@@ -234,7 +234,8 @@ def sky_diffuse_passias(masking_angle):
     return 1 - cosd(masking_angle/2)**2
 
 
-def projected_solar_zenith_angle(axis_tilt, axis_azimuth, solar_zenith, solar_azimuth):
+def projected_solar_zenith_angle(axis_tilt, axis_azimuth,
+                                 solar_zenith, solar_azimuth):
     r"""
     Calculate projected solar zenith angle in degrees.
     This is the solar zenith angle projected onto the tracker rotation plane or
diff --git a/pvlib/tests/test_shading.py b/pvlib/tests/test_shading.py
index 1ecfb8d03a..85e2335bae 100644
--- a/pvlib/tests/test_shading.py
+++ b/pvlib/tests/test_shading.py
@@ -196,7 +196,8 @@ def singleaxis_psz_implementation_port_data():
 
 
 def test_projected_solar_zenith_angle_numeric(
-    true_tracking_angle_and_inputs_NREL, singleaxis_psz_implementation_port_data
+    true_tracking_angle_and_inputs_NREL,
+    singleaxis_psz_implementation_port_data
 ):
     psz_func = shading.projected_solar_zenith_angle
     axis_tilt, axis_azimuth, timedata = true_tracking_angle_and_inputs_NREL
@@ -218,7 +219,8 @@ def test_projected_solar_zenith_angle_numeric(
     assert_allclose(psz, -timedata["True-Tracking"], atol=1e-3)
 
     # test implementation port from tracking.singleaxis
-    axis_tilt, axis_azimuth, singleaxis = singleaxis_psz_implementation_port_data
+    axis_tilt, axis_azimuth, singleaxis = \
+        singleaxis_psz_implementation_port_data
     psz = pvlib.tracking.singleaxis(
         singleaxis["Apparent Zenith"],
         singleaxis["Solar Azimuth"],
@@ -226,7 +228,11 @@ def test_projected_solar_zenith_angle_numeric(
         axis_azimuth,
         backtrack=False,
     )
-    assert_allclose(psz["tracker_theta"], singleaxis["tracker_theta"], atol=1e-6)
+    assert_allclose(
+        psz["tracker_theta"],
+        singleaxis["tracker_theta"],
+        atol=1e-6
+    )
 
 
 @pytest.mark.parametrize(