Combine load_object methods into one

freqtrade/resolvers/pairlist_resolver.py

@@ -6,7 +6,6 @@ This module load custom pairlists
 import logging
 from pathlib import Path
 
-from freqtrade import OperationalException
 from freqtrade.pairlist.IPairList import IPairList
 from freqtrade.resolvers import IResolver
 
@@ -18,6 +17,9 @@ class PairListResolver(IResolver):
     This class contains all the logic to load custom PairList class
     """
     object_type = IPairList
+    object_type_str = "Pairlist"
+    user_subdir = None
+    initial_search_path = Path(__file__).parent.parent.joinpath('pairlist').resolve()
 
     @staticmethod
     def load_pairlist(pairlist_name: str, exchange, pairlistmanager,
@@ -32,34 +34,10 @@ class PairListResolver(IResolver):
         :param pairlist_pos: Position of the pairlist in the list of pairlists
         :return: initialized Pairlist class
         """
-
-        return PairListResolver._load_pairlist(pairlist_name, config,
-                                               kwargs={'exchange': exchange,
-                                                       'pairlistmanager': pairlistmanager,
-                                                       'config': config,
-                                                       'pairlistconfig': pairlistconfig,
-                                                       'pairlist_pos': pairlist_pos})
-
-    @staticmethod
-    def _load_pairlist(pairlist_name: str, config: dict, kwargs: dict) -> IPairList:
-        """
-        Search and loads the specified pairlist.
-        :param pairlist_name: name of the module to import
-        :param config: configuration dictionary
-        :param extra_dir: additional directory to search for the given pairlist
-        :return: PairList instance or None
-        """
-        current_path = Path(__file__).parent.parent.joinpath('pairlist').resolve()
-
-        abs_paths = IResolver.build_search_paths(config, current_path=current_path,
-                                                 user_subdir=None, extra_dir=None)
-
-        pairlist = PairListResolver._load_object(paths=abs_paths,
-                                                 object_name=pairlist_name,
-                                                 kwargs=kwargs)
-        if pairlist:
-            return pairlist
-        raise OperationalException(
-            f"Impossible to load Pairlist '{pairlist_name}'. This class does not exist "
-            "or contains Python code errors."
-        )
+        return PairListResolver.load_object(pairlist_name, config,
+                                            kwargs={'exchange': exchange,
+                                                    'pairlistmanager': pairlistmanager,
+                                                    'config': config,
+                                                    'pairlistconfig': pairlistconfig,
+                                                    'pairlist_pos': pairlist_pos},
+                                            )