Initialize datahandlers

freqtrade/data/datahandlers/__init__.py

@@ -1,5 +1,5 @@
 from typing import Type
-
+from pathlib import Path
 from .idatahandler import IDataHandler
 
 
@@ -20,3 +20,17 @@ def get_datahandlerclass(datatype: str) -> Type[IDataHandler]:
         return JsonGzDataHandler
     else:
         raise ValueError(f"No datahandler for datatype {datatype} available.")
+
+
+def get_datahandler(datadir: Path, data_format: str = None,
+                    data_handler: IDataHandler = None) -> IDataHandler:
+    """
+    :param datadir: Folder to save data
+    :data_format: dataformat to use
+    :data_handler: returns this datahandler if it exists or initializes a new one
+    """
+
+    if not data_handler:
+        HandlerClass = get_datahandlerclass(data_format or 'json')
+        data_handler = HandlerClass(datadir)
+    return data_handler