merged order book

freqtrade/strategy/interface.py

@@ -2,7 +2,7 @@
 IStrategy interface
 This module defines the interface to apply for strategies
 """
-
+from typing import Dict
 from abc import ABC, abstractmethod
 
 from pandas import DataFrame
@@ -16,9 +16,13 @@ class IStrategy(ABC):
     Attributes you can use:
         minimal_roi -> Dict: Minimal ROI designed for the strategy
         stoploss -> float: optimal stoploss designed for the strategy
-        ticker_interval -> int: value of the ticker interval to use for the strategy
+        ticker_interval -> str: value of the ticker interval to use for the strategy
     """
 
+    minimal_roi: Dict
+    stoploss: float
+    ticker_interval: str
+
     @abstractmethod
     def populate_indicators(self, dataframe: DataFrame) -> DataFrame:
         """

freqtrade/strategy/resolver.py

@@ -36,7 +36,8 @@ class StrategyResolver(object):
 
         # Verify the strategy is in the configuration, otherwise fallback to the default strategy
         strategy_name = config.get('strategy') or constants.DEFAULT_STRATEGY
-        self.strategy = self._load_strategy(strategy_name, extra_dir=config.get('strategy_path'))
+        self.strategy: IStrategy = self._load_strategy(strategy_name,
+                                                       extra_dir=config.get('strategy_path'))
 
         # Set attributes
         # Check if we need to override configuration
@@ -64,7 +65,7 @@ class StrategyResolver(object):
         self.strategy.stoploss = float(self.strategy.stoploss)
 
     def _load_strategy(
-            self, strategy_name: str, extra_dir: Optional[str] = None) -> Optional[IStrategy]:
+            self, strategy_name: str, extra_dir: Optional[str] = None) -> IStrategy:
         """
         Search and loads the specified strategy.
         :param strategy_name: name of the module to import
@@ -123,7 +124,7 @@ class StrategyResolver(object):
         # Generate spec based on absolute path
         spec = importlib.util.spec_from_file_location('user_data.strategies', module_path)
         module = importlib.util.module_from_spec(spec)
-        spec.loader.exec_module(module)
+        spec.loader.exec_module(module)  # type: ignore # importlib does not use typehints
 
         valid_strategies_gen = (
             obj for name, obj in inspect.getmembers(module, inspect.isclass)