Slightly imporve Typing by reusing long/short type

freqtrade/exchange/exchange.py

@@ -20,7 +20,7 @@ from ccxt.base.decimal_to_precision import (ROUND_DOWN, ROUND_UP, TICK_SIZE, TRU
 from pandas import DataFrame
 
 from freqtrade.constants import (DEFAULT_AMOUNT_RESERVE_PERCENT, NON_OPEN_EXCHANGE_STATES,
-                                 ListPairsWithTimeframes, PairWithTimeframe)
+                                 EntryExit, ListPairsWithTimeframes, PairWithTimeframe)
 from freqtrade.data.converter import ohlcv_to_dataframe, trades_dict_to_list
 from freqtrade.enums import OPTIMIZE_MODES, CandleType, MarginMode, TradingMode
 from freqtrade.exceptions import (DDosProtection, ExchangeError, InsufficientFundsError,
@@ -1429,7 +1429,7 @@ class Exchange:
             raise OperationalException(e) from e
 
     def get_rate(self, pair: str, refresh: bool,
-                 side: Literal['entry', 'exit'], is_short: bool) -> float:
+                 side: EntryExit, is_short: bool) -> float:
         """
         Calculates bid/ask target
         bid rate - between current ask price and last price