Improve ticker type

freqtrade/exchange/binance.py

@@ -11,6 +11,7 @@ from freqtrade.enums import CandleType, MarginMode, TradingMode
 from freqtrade.exceptions import DDosProtection, OperationalException, TemporaryError
 from freqtrade.exchange import Exchange
 from freqtrade.exchange.common import retrier
+from freqtrade.exchange.types import Tickers
 from freqtrade.misc import deep_merge_dicts, json_load
 
 
@@ -59,7 +60,7 @@ class Binance(Exchange):
                 )
             ))
 
-    def get_tickers(self, symbols: Optional[List[str]] = None, cached: bool = False) -> Dict:
+    def get_tickers(self, symbols: Optional[List[str]] = None, cached: bool = False) -> Tickers:
         tickers = super().get_tickers(symbols=symbols, cached=cached)
         if self.trading_mode == TradingMode.FUTURES:
             # Binance's future result has no bid/ask values.

freqtrade/exchange/types.py

@@ -1,5 +1,16 @@
-from typing import Any, Dict
+from typing import Dict, Optional, TypedDict
+
+
+class Ticker(TypedDict):
+    symbol: str
+    ask: Optional[float]
+    askVolume: Optional[float]
+    bid: Optional[float]
+    bidVolume: Optional[float]
+    last: Optional[float]
+    quoteVolume: Optional[float]
+    baseVolume: Optional[float]
+    # Several more - only listing required.
 
 
-Ticker = Dict[str, Any]
 Tickers = Dict[str, Ticker]