Fix flake8 warnings

Author: MDUYN

investing_algorithm_framework/app/app.py

@@ -24,8 +24,7 @@
 from investing_algorithm_framework.infrastructure import setup_sqlalchemy, \
     create_all_tables, CCXTOrderExecutor, CCXTPortfolioProvider
 from investing_algorithm_framework.services import OrderBacktestService, \
-    BacktestMarketDataSourceService, BacktestPortfolioService, \
-    MarketDataSourceService, MarketCredentialService
+    BacktestMarketDataSourceService, BacktestPortfolioService
 
 logger = logging.getLogger("investing_algorithm_framework")
 COLOR_RESET = '\033[0m'
@@ -156,7 +155,6 @@ def initialize_services(self) -> None:
         Returns:
             None
         """
-        configuration_service = self.container.configuration_service()
         self._initialize_default_order_executors()
         self._initialize_default_portfolio_providers()
 

investing_algorithm_framework/app/context.py

@@ -1205,7 +1205,7 @@ def add_stop_loss(
         self,
         trade,
         percentage: float,
-        trade_risk_type = TradeRiskType.FIXED,
+        trade_risk_type=TradeRiskType.FIXED,
         sell_percentage: float = 100,
     ):
         """
@@ -1248,7 +1248,7 @@ def add_take_profit(
         self,
         trade,
         percentage: float,
-        trade_risk_type = TradeRiskType.FIXED,
+        trade_risk_type=TradeRiskType.FIXED,
         sell_percentage: float = 100,
     ) -> None:
         """