Make stoploss an attribute

freqtrade/pairlist/PrecisionFilter.py

@@ -1,6 +1,6 @@
 import logging
 from copy import deepcopy
-from typing import Dict, List
+from typing import Any, Dict, List
 
 from freqtrade.pairlist.IPairList import IPairList
 
@@ -9,6 +9,16 @@ logger = logging.getLogger(__name__)
 
 class PrecisionFilter(IPairList):
 
+    def __init__(self, exchange, pairlistmanager,
+                 config: Dict[str, Any], pairlistconfig: Dict[str, Any],
+                 pairlist_pos: int) -> None:
+        super().__init__(exchange, pairlistmanager, config, pairlistconfig, pairlist_pos)
+
+        self._stoploss = self._config.get('stoploss')
+        if self._stoploss is not None:
+            # Precalculate sanitized stoploss value to avoid recalculation for every pair
+            self._stoploss = 1 - abs(self._stoploss)
+
     @property
     def needstickers(self) -> bool:
         """
@@ -49,15 +59,12 @@ class PrecisionFilter(IPairList):
         """
         Filters and sorts pairlists and assigns and returns them again.
         """
-        stoploss = self._config.get('stoploss')
-        if stoploss is not None:
-            # Precalculate sanitized stoploss value to avoid recalculation for every pair
-            stoploss = 1 - abs(stoploss)
         # Copy list since we're modifying this list
         for p in deepcopy(pairlist):
             ticker = tickers.get(p)
             # Filter out assets which would not allow setting a stoploss
-            if not ticker or (stoploss and not self._validate_precision_filter(ticker, stoploss)):
+            if not ticker or (self._stoploss
+                              and not self._validate_precision_filter(ticker, self._stoploss)):
                 pairlist.remove(p)
                 continue