don't allow to resolve object if there are more than one module containing it

freqtrade/resolvers/exchange_resolver.py

@@ -14,6 +14,7 @@ class ExchangeResolver(IResolver):
     """
     This class contains all the logic to load a custom exchange class
     """
+    type_name = "Exchange"
 
     __slots__ = ['exchange']
 

freqtrade/resolvers/hyperopt_resolver.py

@@ -19,6 +19,7 @@ class HyperOptResolver(IResolver):
     """
     This class contains all the logic to load custom hyperopt class
     """
+    type_name = "Hyperopt"
 
     __slots__ = ['hyperopt']
 

freqtrade/resolvers/iresolver.py

@@ -9,6 +9,9 @@ import logging
 from pathlib import Path
 from typing import Any, Optional, Tuple, Type, Union
 
+from freqtrade import OperationalException
+
+
 logger = logging.getLogger(__name__)
 
 
@@ -16,6 +19,7 @@ class IResolver(object):
     """
     This class contains all the logic to load custom classes
     """
+    type_name = "Unknown"
 
     @staticmethod
     def _get_valid_object(object_type, module_path: Path,
@@ -43,8 +47,8 @@ class IResolver(object):
         )
         return next(valid_objects_gen, None)
 
-    @staticmethod
-    def _search_object(directory: Path, object_type, object_name: str,
+    @classmethod
+    def _search_object(self, directory: Path, object_type, object_name: str,
                        kwargs: dict = {}) -> Union[Tuple[Any, Path], Tuple[None, None]]:
         """
         Search for the objectname in the given directory
@@ -52,6 +56,7 @@ class IResolver(object):
         :return: object instance
         """
         logger.debug("Searching for %s %s in '%s'", object_type.__name__, object_name, directory)
+        objs = []
         for entry in directory.iterdir():
             # Only consider python files
             if not str(entry).endswith('.py'):
@@ -62,5 +67,16 @@ class IResolver(object):
                 object_type, module_path, object_name
             )
             if obj:
-                return (obj(**kwargs), module_path)
-        return (None, None)
+                objs.append((obj, module_path))
+        if len(objs) == 0:
+            return (None, None)
+        elif len(objs) == 1:
+            obj, module_path = objs[0]
+            return (obj(**kwargs), module_path)
+        else:
+            raise OperationalException(
+                    f"Cannot resolve object: found more than one objects of type "
+                    f"`{self.type_name}` with name `{object_name}`. "
+                    "Use unique names for custom strategies, hyperopts and other custom objects "
+                    "so that Freqtrade can be able to resolve them. "
+                    f"Found in modules: {[str(m) for (_, m) in objs]}")

freqtrade/resolvers/pairlist_resolver.py

@@ -17,6 +17,7 @@ class PairListResolver(IResolver):
     """
     This class contains all the logic to load custom hyperopt class
     """
+    type_name = "PairList"
 
     __slots__ = ['pairlist']
 

freqtrade/resolvers/strategy_resolver.py

@@ -23,6 +23,7 @@ class StrategyResolver(IResolver):
     """
     This class contains all the logic to load custom strategy class
     """
+    type_name = "Strategy"
 
     __slots__ = ['strategy']
 

freqtrade/strategy/__init__.py

@@ -2,9 +2,8 @@ import logging
 import sys
 from copy import deepcopy
 
+from freqtrade import constants
 from freqtrade.strategy.interface import IStrategy
-# Import Default-Strategy to have hyperopt correctly resolve
-from freqtrade.strategy.default_strategy import DefaultStrategy  # noqa: F401
 
 
 logger = logging.getLogger(__name__)
@@ -28,7 +27,10 @@ def import_strategy(strategy: IStrategy, config: dict) -> IStrategy:
     attr = deepcopy(comb)
 
     # Adjust module name
-    attr['__module__'] = 'freqtrade.strategy'
+    attr['__module__'] = (
+            'freqtrade.strategy.default_strategy'
+            if config.get('strategy') == constants.DEFAULT_STRATEGY
+            else 'freqtrade.strategy')
 
     name = strategy.__class__.__name__
     clazz = type(name, (IStrategy,), attr)

freqtrade/tests/strategy/test_strategy.py

@@ -44,7 +44,8 @@ def test_import_strategy(caplog):
 
 def test_search_strategy():
     default_config = {}
-    default_location = Path(__file__).parent.parent.joinpath('strategy').resolve()
+    # Use default strategy from freqtrade/strategy, not from freqtrade/tests/strategy
+    default_location = Path(__file__).parent.parent.parent.joinpath('strategy').resolve()
 
     s, _ = StrategyResolver._search_object(
         directory=default_location,