Ause isclose for comparison, assign filled to variable

add some comments

freqtrade/freqtradebot.py

@@ -898,6 +898,7 @@ class FreqtradeBot:
         Buy timeout - cancel order
         :return: True if order was fully cancelled
         """
+        # Cancelled orders may have the status of 'canceled' or 'closed'
         if order['status'] not in ('canceled', 'closed'):
             reason = "cancelled due to timeout"
             corder = self.exchange.cancel_order_with_result(trade.open_order_id, trade.pair,
@@ -909,7 +910,10 @@ class FreqtradeBot:
 
         logger.info('Buy order %s for %s.', reason, trade)
 
-        if safe_value_fallback(corder, order, 'filled', 'filled') == 0.0:
+        # Using filled to determine the filled amount
+        filled_amount = safe_value_fallback(corder, order, 'filled', 'filled')
+
+        if isclose(filled_amount, 0.0, abs_tol=constants.MATH_CLOSE_PREC):
             logger.info('Buy order fully cancelled. Removing %s from database.', trade)
             # if trade is not partially completed, just delete the trade
             Trade.session.delete(trade)
@@ -921,7 +925,7 @@ class FreqtradeBot:
         # cancel_order may not contain the full order dict, so we need to fallback
         # to the order dict aquired before cancelling.
         # we need to fall back to the values from order if corder does not contain these keys.
-        trade.amount = safe_value_fallback(corder, order, 'filled', 'filled')
+        trade.amount = filled_amount
         trade.stake_amount = trade.amount * trade.open_rate
         self.update_trade_state(trade, corder, trade.amount)