diff --git a/timeseries_pandas/calc.py b/timeseries_pandas/calc.py
index e9a837bd8236a8cfece5969a6fb32a68ce532962..de84a7403707c209bdea6611838d1015d1c89fa8 100644
--- a/timeseries_pandas/calc.py
+++ b/timeseries_pandas/calc.py
@@ -145,7 +145,7 @@ def calc_hot_cold(df):
     """
 
     print("Calculating the number of hot and cold days")
-    
+
     # Calculation of the number of hot and cold days:
 
     n_hot_days = (