max_open_trades should be an integer

Max open trades will be always an integer in the strategy (-1 for infinity), but in the config -1 will be parsed as infinity

freqtrade/optimize/backtesting.py

@@ -920,7 +920,7 @@ class Backtesting:
                 trade.close(exit_row[OPEN_IDX], show_msg=False)
                 LocalTrade.close_bt_trade(trade)
 
-    def trade_slot_available(self, max_open_trades: int | float, open_trade_count: int) -> bool:
+    def trade_slot_available(self, max_open_trades: int, open_trade_count: int) -> bool:
         # Always allow trades when max_open_trades is enabled.
         if max_open_trades <= 0 or open_trade_count < max_open_trades:
             return True
@@ -1051,7 +1051,7 @@ class Backtesting:
 
     def backtest_loop(
             self, row: Tuple, pair: str, current_time: datetime, end_date: datetime,
-            max_open_trades: int | float,
+            max_open_trades: int,
             open_trade_count_start: int, is_first: bool = True) -> int:
         """
         NOTE: This method is used by Hyperopt at each iteration. Please keep it optimized.
@@ -1123,7 +1123,7 @@ class Backtesting:
 
     def backtest(self, processed: Dict,
                  start_date: datetime, end_date: datetime,
-                 max_open_trades: int | float = 0) -> Dict[str, Any]:
+                 max_open_trades: int = 0) -> Dict[str, Any]:
         """
         Implement backtesting functionality
 
@@ -1228,7 +1228,8 @@ class Backtesting:
         # Use max_open_trades in backtesting, except --disable-max-market-positions is set
         if self.config.get('use_max_market_positions', True):
             # Must come from strategy config, as the strategy may modify this setting.
-            max_open_trades = self.strategy.config['max_open_trades']
+            max_open_trades = self.strategy.config['max_open_trades'] \
+                if self.strategy.config['max_open_trades'] != float('inf') else -1
         else:
             logger.info(
                 'Ignoring max_open_trades (--disable-max-market-positions was used) ...')

freqtrade/optimize/hyperopt.py

@@ -119,11 +119,14 @@ class Hyperopt:
 
         # Use max_open_trades for hyperopt as well, except --disable-max-market-positions is set
         if self.config.get('use_max_market_positions', True):
-            self.max_open_trades = self.config['max_open_trades']
+            self.max_open_trades = self.config['max_open_trades'] \
+                if self.config['max_open_trades'] != float('inf') else -1
         else:
             logger.debug('Ignoring max_open_trades (--disable-max-market-positions was used) ...')
             self.max_open_trades = 0
 
+        print("Strategy max open trades", self.max_open_trades)
+
         if HyperoptTools.has_space(self.config, 'sell'):
             # Make sure use_exit_signal is enabled
             self.config['use_exit_signal'] = True

freqtrade/optimize/optimize_reports.py

@@ -191,7 +191,7 @@ def generate_tag_metrics(tag_type: str,
         return []
 
 
-def generate_exit_reason_stats(max_open_trades: int | float, results: DataFrame) -> List[Dict]:
+def generate_exit_reason_stats(max_open_trades: int, results: DataFrame) -> List[Dict]:
     """
     Generate small table outlining Backtest results
     :param max_open_trades: Max_open_trades parameter