flake fix

Author: aman-coder03

tests/test_transformer.py

@@ -1,10 +1,9 @@
 import pandas as pd
+import pytest
 
 from numpy.testing import assert_allclose
-
 from pvlib import transformer
 
-import pytest
 
 def test_simple_efficiency():
 
@@ -60,19 +59,18 @@ def test_simple_efficiency_known_values():
         rating,
     )
 
+
 @pytest.mark.parametrize(
     "input_power, no_load_loss, load_loss, transformer_rating, expected",
     [
         (1000.0, 0.01, 0.0, 1000.0, 990.0),
     ],
 )
-
 def test_simple_efficiency_zero_load_loss(
     input_power, no_load_loss, load_loss, transformer_rating, expected
 ):
     # for load_loss = 0, the model reduces to:
     # P_out = P_in - L_no_load * P_nom
-
     result = transformer.simple_efficiency(
         input_power=input_power,
         no_load_loss=no_load_loss,