diff --git a/qlib/contrib/backtest/__init__.py b/qlib/contrib/backtest/__init__.py
index 483b15d39..aa24ffb0c 100644
--- a/qlib/contrib/backtest/__init__.py
+++ b/qlib/contrib/backtest/__init__.py
@@ -16,6 +16,7 @@ from ...config import C
 
 logger = get_module_logger("backtest caller")
 
+
 def get_strategy(
     strategy=None,
     topk=50,
@@ -61,7 +62,6 @@ def get_strategy(
     an initialized strategy object
     """
 
-    
     # There  will be 3 ways to return a strategy.
     if strategy is None:
         # 1) create strategy with param `strategy`
@@ -72,6 +72,7 @@ def get_strategy(
         }
         logger.info("Create new strategy ")
         from .. import strategy as strategy_pool
+
         str_cls = getattr(strategy_pool, str_cls_dict.get(str_type))
         strategy = str_cls(
             topk=topk,
@@ -86,6 +87,7 @@ def get_strategy(
         strategy = init_instance_by_config(strategy)
 
     from ..strategy.strategy import BaseStrategy
+
     # else: nothing happens. 3) Use the strategy directly
     if not isinstance(strategy, BaseStrategy):
         raise TypeError("Strategy not supported")
@@ -193,12 +195,13 @@ def get_executor(
     :class: BaseExecutor
     an initialized BaseExecutor object
     """
-    
+
     # There  will be 3 ways to return a executor.
     if executor is None:
         # 1) create executor with param `executor`
         logger.info("Create new executor ")
         from ..online.executor import SimulatorExecutor
+
         executor = SimulatorExecutor(trade_exchange=trade_exchange, verbose=verbose)
     elif isinstance(executor, (dict, str)):
         # 2) create executor with config
@@ -206,11 +209,13 @@ def get_executor(
         executor = init_instance_by_config(executor)
 
     from ..online.executor import BaseExecutor
+
     # 3) Use the executor directly
     if not isinstance(executor, BaseExecutor):
         raise TypeError("Executor not supported")
     return executor
 
+
 # This is the API for compatibility for legacy code
 def backtest(pred, account=1e9, shift=1, benchmark="SH000905", verbose=True, return_order=False, **kwargs):
     """This function will help you set a reasonable Exchange and provide default value for strategy
@@ -316,4 +321,4 @@ def backtest(pred, account=1e9, shift=1, benchmark="SH000905", verbose=True, ret
 
     positions = report_dict.get("positions")
     report_dict.update({"positions": {k: p.position for k, p in positions.items()}})
-    return report_dict
\ No newline at end of file
+    return report_dict
diff --git a/qlib/contrib/evaluate.py b/qlib/contrib/evaluate.py
index 6ac7511a7..4aa5b5515 100644
--- a/qlib/contrib/evaluate.py
+++ b/qlib/contrib/evaluate.py
@@ -45,7 +45,6 @@ def risk_analysis(r, N=252):
     return res
 
 
-
 # This is the API for compatibility for legacy code
 def backtest(pred, account=1e9, shift=1, benchmark="SH000905", verbose=True, **kwargs):
     """This function will help you set a reasonable Exchange and provide default value for strategy
@@ -120,8 +119,12 @@ def backtest(pred, account=1e9, shift=1, benchmark="SH000905", verbose=True, **k
         whether to print log.
 
     """
-    warnings.warn("this function is deprecated, please use backtest function in qlib.contrib.backtest", DeprecationWarning)
-    report_dict = backtest_func(pred=pred, account=account, shift=shift, benchmark=benchmark, verbose=verbose, return_order=False, **kwargs)
+    warnings.warn(
+        "this function is deprecated, please use backtest function in qlib.contrib.backtest", DeprecationWarning
+    )
+    report_dict = backtest_func(
+        pred=pred, account=account, shift=shift, benchmark=benchmark, verbose=verbose, return_order=False, **kwargs
+    )
     return report_dict.get("report_df"), report_dict.get("positions")