Update more enums

freqtrade/enums/signaltype.py

@@ -10,6 +10,9 @@ class SignalType(Enum):
     ENTER_SHORT = "enter_short"
     EXIT_SHORT = "exit_short"
 
+    def __str__(self):
+        return f"{self.name.lower()}"
+
 
 class SignalTagType(Enum):
     """
@@ -18,7 +21,13 @@ class SignalTagType(Enum):
     ENTER_TAG = "enter_tag"
     EXIT_TAG = "exit_tag"
 
+    def __str__(self):
+        return f"{self.name.lower()}"
+
 
 class SignalDirection(str, Enum):
     LONG = 'long'
     SHORT = 'short'
+
+    def __str__(self):
+        return f"{self.name.lower()}"