diff --git a/.gitignore b/.gitignore
index 5424959..9e727ff 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,9 @@
-dist/
-run_check/
-examples/.ipynb_checkpoints/
-optionlab/__pycache__/
+.mypy_cache
+.pytest_cache
+__pycache__
+dist
+run_check
+examples/.ipynb_checkpoints
+optionlab/__pycache__
 tests/__pycache__
 tests/.benchmarks
diff --git a/optionlab/engine.py b/optionlab/engine.py
index 05a322d..bce477b 100644
--- a/optionlab/engine.py
+++ b/optionlab/engine.py
@@ -5,7 +5,8 @@
 from typing import Any
 
 from numpy import array, zeros
-#from numpy import ndarray
+
+# from numpy import ndarray
 
 from optionlab.black_scholes import get_bs_info, get_implied_vol
 from optionlab.models import (
@@ -29,8 +30,9 @@
     create_price_samples,
     get_pop,
 )
-from optionlab.utils import get_nonbusiness_days 
-#from optionlab.utils import get_pl, pl_to_csv
+from optionlab.utils import get_nonbusiness_days
+
+# from optionlab.utils import get_pl, pl_to_csv
 
 
 def run_strategy(inputs_data: Inputs | dict) -> Outputs:
@@ -462,6 +464,7 @@ def _generate_outputs(data: EngineData) -> Outputs:
         }
     )
 
+
 # TODO: Delete this class in the next version; for now, leave it as a comment
 # class StrategyEngine:
 #     def __init__(self, inputs_data: Inputs | dict):