Fix syntax error

tests/test_benchmark_simple_scenarios.py → tests/test_benchmark_scenarios.py

@@ -305,6 +305,10 @@ def test_benchmark_AFG_grid_heatpump_heat(self, margs):
             VALUE
         ]["data"]
         # compare cost of using heat pump with electricity price to heat price
+        cost_of_using_heatpump = "electricity_price[i] / data[ENERGY_CONVERSION]['heat_pump'][EFFICIENCY][VALUE] comp.data[ENERGY_PROVIDERS]['Heat DSO'][ENERGY_PRICE][VALUE]"
+        cost_of_using_heat_dso = (
+            "data[ENERGY_PROVIDERS]['Heat DSO'][ENERGY_PRICE][VALUE]"
+        )
         for i in range(0, len(electricity_price)):
             if (
                 electricity_price[i]
@@ -313,7 +317,7 @@ def test_benchmark_AFG_grid_heatpump_heat(self, margs):
             ):
                 assert busses_flow["Heat DSO_consumption_period"][i] == approx(
                     abs(busses_flow["demand_heat"][i])
-                ), f'Even though the marginal costs to use the heat pump are higher then the heat DSO price with {electricity_price[i] / data[ENERGY_CONVERSION][{"heat_pump"][EFFICIENCY][VALUE]} comp. data[ENERGY_PROVIDERS]["Heat DSO"][ENERGY_PRICE][VALUE]}, the heat DSO is not solely used for energy supply.'
+                ), f"Even though the marginal costs to use the heat pump are higher than the heat DSO price with {cost_of_using_heatpump} comp. {cost_of_using_heat_dso}, the heat DSO is not solely used for energy supply."
             else:
                 assert busses_flow["heat_pump"][i] == approx(
                     abs(busses_flow["demand_heat"][i])