exportfilename can be a file or directory

freqtrade/configuration/configuration.py

@@ -199,7 +199,7 @@ class Configuration:
             config['exportfilename'] = Path(config['exportfilename'])
         else:
             config['exportfilename'] = (config['user_data_dir']
-                                        / 'backtest_results/backtest-result.json')
+                                        / 'backtest_results')
 
     def _process_optimize_options(self, config: Dict[str, Any]) -> None:
 

freqtrade/data/btanalysis.py

@@ -38,7 +38,8 @@ def get_latest_backtest_filename(directory: Union[Path, str]) -> str:
     filename = directory / LAST_BT_RESULT_FN
 
     if not filename.is_file():
-        raise ValueError(f"Directory '{directory}' does not seem to contain backtest statistics yet.")
+        raise ValueError(
+            f"Directory '{directory}' does not seem to contain backtest statistics yet.")
 
     with filename.open() as file:
         data = json_load(file)
@@ -57,9 +58,11 @@ def load_backtest_stats(filename: Union[Path, str]) -> Dict[str, Any]:
     """
     if isinstance(filename, str):
         filename = Path(filename)
+    if filename.is_dir():
+        filename = get_latest_backtest_filename(filename)
     if not filename.is_file():
         raise ValueError(f"File {filename} does not exist.")
-
+    logger.info(f"Loading backtest result from {filename}")
     with filename.open() as file:
         data = json_load(file)
 

freqtrade/optimize/optimize_reports.py

@@ -16,12 +16,17 @@ logger = logging.getLogger(__name__)
 
 def store_backtest_stats(recordfilename: Path, stats: Dict[str, DataFrame]) -> None:
 
-    filename = Path.joinpath(recordfilename.parent,
-                             f'{recordfilename.stem}-{datetime.now().isoformat()}'
+    if recordfilename.is_dir():
+        filename = recordfilename / \
+            f'backtest-result-{datetime.now().strftime("%Y-%m-%d_%H-%M-%S")}.json'
+    else:
+        filename = Path.joinpath(
+            recordfilename.parent,
+            f'{recordfilename.stem}-{datetime.now().strftime("%Y-%m-%d_%H-%M-%S")}'
             ).with_suffix(recordfilename.suffix)
     file_dump_json(filename, stats)
 
-    latest_filename = Path.joinpath(recordfilename.parent, LAST_BT_RESULT_FN)
+    latest_filename = Path.joinpath(filename.parent, LAST_BT_RESULT_FN)
     file_dump_json(latest_filename, {'latest_backtest': str(filename.name)})