Fixed List typing issue for older verions

EngieApi/Contracts.py

@@ -1,4 +1,5 @@
 import datetime
+from typing import List
 
 import numpy as np
 
@@ -8,7 +9,6 @@ from EngieApi.EngieAPI import EngieAPI
 
 class Dynamic:
     def __init__(self, btw=1.21):
-
         self.btw = btw
         self.vast = 100.7  # EUR / jaar
 
@@ -35,22 +35,26 @@ class Dynamic:
         prijs = 0.2040 + 0.1 * (epex_spot)  # zonder BTW per Cent/kWh
         # cent to eur
         prijs /= 100
-        prijs += self.groene_stroom + self.wwk + self.energiebijdrage + self.federale_accijns
-        
+        prijs += (
+            self.groene_stroom + self.wwk + self.energiebijdrage + self.federale_accijns
+        )
+
         # distirbution costs
         d = Capaciteitstarief()
         p, yearly = d.calculate_per_kwh(peak=peak)
         prijs += p
-        
+
         # add btw
         prijs *= self.btw
         return prijs, yearly + self.vast
 
-    def calculate_total_price_for_day(self, verbruik: list[int], date: datetime.date, peak: float) -> float:
+    def calculate_total_price_for_day(
+        self, verbruik: List[int], date: datetime.date, peak: float
+    ) -> float:
         """calculate_total_price_for_day calculate total price for given usage
 
         :param verbruik: a list of hourly usage values
-        :type verbruik: list[int]
+        :type verbruik: List[int]
         :param date: the date for the energy prices
         :type date: datetime.date
         :param peak: the monthly peak for the distribution costs