Add trailing_space() into AdvancedSampleHyperOpt

freqtrade/templates/sample_hyperopt_advanced.py

@@ -233,6 +233,27 @@ class AdvancedSampleHyperOpt(IHyperOpt):
             Real(-0.5, -0.02, name='stoploss'),
         ]
 
+    @staticmethod
+    def trailing_space() -> List[Dimension]:
+        """
+        Create a trailing stoploss space.
+
+        You may override it in your custom Hyperopt class.
+        """
+        return [
+            # It was decided to always set trailing_stop is to True if the 'trailing' hyperspace
+            # is used. Otherwise hyperopt will vary other parameters that won't have effect if
+            # trailing_stop is set False.
+            # This parameter is included into the hyperspace dimensions rather than assigning
+            # it explicitly in the code in order to have it printed in the results along with
+            # other 'trailing' hyperspace parameters.
+            Categorical([True], name='trailing_stop'),
+
+            Real(0.02, 0.35, name='trailing_stop_positive'),
+            Real(0.01, 0.1, name='trailing_stop_positive_offset'),
+            Categorical([True, False], name='trailing_only_offset_is_reached'),
+        ]
+
     def populate_buy_trend(self, dataframe: DataFrame, metadata: dict) -> DataFrame:
         """
         Based on TA indicators.