Added a friendly entity class.

squirrelbattle/interfaces.py

@@ -422,3 +422,17 @@ class FightingEntity(Entity):
         for name in self.keys():
             d[name] = getattr(self, name)
         return d
+
+class FriendlyEntity(Entity):
+    """
+    Friendly entities are living entities which do not attack the player
+    """
+    maxhealth: int
+    health: int #Friendly entities can be killed
+
+    def __init__(self, maxhealth: int = 0, health: Optional[int] = None,
+                 *args, **kwargs) -> None:
+        super().__init__(*args, **kwargs)
+        self.maxhealth = maxhealth
+        self.health = maxhealth if health is None else health
+