Refactor get_bt_resutlist to reduce code complexity

freqtrade/data/btanalysis.py

@@ -175,10 +175,8 @@ def _get_backtest_files(dirname: Path) -> List[Path]:
     return list(reversed(sorted(dirname.glob('backtest-result-*-[0-9][0-9].json'))))
 
 
-def get_backtest_result(filename: Path) -> List[BacktestHistoryEntryType]:
+def _extract_backtest_result(filename: Path) -> List[BacktestHistoryEntryType]:
-    """
+    metadata = load_backtest_metadata(filename)
-    Get backtest result read from metadata file
-    """
     return [
         {
             'filename': filename.stem,
@@ -186,25 +184,25 @@ def get_backtest_result(filename: Path) -> List[BacktestHistoryEntryType]:
             'run_id': v['run_id'],
             'notes': v.get('notes', ''),
             'backtest_start_time': v['backtest_start_time'],
-        } for s, v in load_backtest_metadata(filename).items()
+        } for s, v in metadata.items()
     ]
 
 
+def get_backtest_result(filename: Path) -> List[BacktestHistoryEntryType]:
+    """
+    Get backtest result read from metadata file
+    """
+    return _extract_backtest_result(filename)
+
+
 def get_backtest_resultlist(dirname: Path) -> List[BacktestHistoryEntryType]:
     """
     Get list of backtest results read from metadata files
     """
     return [
-        {
+        result
-            'filename': filename.stem,
-            'strategy': s,
-            'run_id': v['run_id'],
-            'notes': v.get('notes', ''),
-            'backtest_start_time': v['backtest_start_time'],
-        }
         for filename in _get_backtest_files(dirname)
-        for s, v in load_backtest_metadata(filename).items()
+        for result in _extract_backtest_result(filename)
-        if v
     ]