Introduce datatype for informative pairs

freqtrade/data/dataprovider.py

@@ -9,11 +9,13 @@ from typing import Any, Dict, List, Optional, Tuple
 
 from pandas import DataFrame
 
+from freqtrade.data.common import ListPairsWithTimeframes
 from freqtrade.data.history import load_pair_history
 from freqtrade.exceptions import DependencyException, OperationalException
 from freqtrade.exchange import Exchange
 from freqtrade.state import RunMode
 
+
 logger = logging.getLogger(__name__)
 
 
@@ -25,8 +27,8 @@ class DataProvider:
         self._pairlists = pairlists
 
     def refresh(self,
-                pairlist: List[Tuple[str, str]],
-                helping_pairs: List[Tuple[str, str]] = None) -> None:
+                pairlist: ListPairsWithTimeframes,
+                helping_pairs: ListPairsWithTimeframes = None) -> None:
         """
         Refresh data, called with each cycle
         """
@@ -36,7 +38,7 @@ class DataProvider:
             self._exchange.refresh_latest_ohlcv(pairlist)
 
     @property
-    def available_pairs(self) -> List[Tuple[str, str]]:
+    def available_pairs(self) -> ListPairsWithTimeframes:
         """
         Return a list of tuples containing (pair, timeframe) for which data is currently cached.
         Should be whitelist + open trades.

freqtrade/exchange/exchange.py

@@ -18,6 +18,7 @@ from ccxt.base.decimal_to_precision import (ROUND_DOWN, ROUND_UP, TICK_SIZE,
                                             TRUNCATE, decimal_to_precision)
 from pandas import DataFrame
 
+from freqtrade.data.common import ListPairsWithTimeframes
 from freqtrade.data.converter import ohlcv_to_dataframe, trades_dict_to_list
 from freqtrade.exceptions import (DependencyException, InvalidOrderException,
                                   OperationalException, TemporaryError)
@@ -676,7 +677,7 @@ class Exchange:
         logger.info("Downloaded data for %s with length %s.", pair, len(data))
         return data
 
-    def refresh_latest_ohlcv(self, pair_list: List[Tuple[str, str]]) -> List[Tuple[str, List]]:
+    def refresh_latest_ohlcv(self, pair_list: ListPairsWithTimeframes) -> List[Tuple[str, List]]:
         """
         Refresh in-memory OHLCV asynchronously and set `_klines` with the result
         Loops asynchronously over pair_list and downloads all pairs async (semi-parallel).

freqtrade/strategy/interface.py

@@ -12,6 +12,7 @@ from typing import Dict, List, NamedTuple, Optional, Tuple
 import arrow
 from pandas import DataFrame
 
+from freqtrade.data.common import ListPairsWithTimeframes
 from freqtrade.data.dataprovider import DataProvider
 from freqtrade.exceptions import StrategyError
 from freqtrade.exchange import timeframe_to_minutes
@@ -185,7 +186,7 @@ class IStrategy(ABC):
         """
         return False
 
-    def informative_pairs(self) -> List[Tuple[str, str]]:
+    def informative_pairs(self) -> ListPairsWithTimeframes:
         """
         Define additional, informative pair/interval combinations to be cached from the exchange.
         These pair/interval combinations are non-tradeable, unless they are part