Solution

app/main.py

@@ -1 +1,101 @@
-# write your code here
+class Animal:
+    """
+    Represents a basic Animal creature, stores all its instances.
+
+    Attributes:
+    ----------
+    name : str
+        the name of the animal
+    health : int
+        the health points of the animal
+    hidden : bool
+        the hiding status of the animal
+    """
+
+    alive = list()
+
+    def __init__(
+            self,
+            name: str,
+            health: int = 100,
+            hidden: bool = False
+    ) -> None:
+        self.name = name
+        self.health = health
+        self.hidden = hidden
+        if self.health > 0:
+            Animal.alive.append(self)
+
+    def __repr__(self) -> str:
+        return (f""
+                f"{{Name: {self.name}, "
+                f"Health: {self.health}, "
+                f"Hidden: {self.hidden}}}"
+                )
+
+
+class Herbivore(Animal):
+    """
+    Represents a Herbivore animal.
+
+    Attributes:
+    ----------
+    name : str
+        the name of the animal
+    health : int
+        the health points of the animal
+    hidden : bool
+        the hiding status of the animal
+
+    Methods:
+    -------
+    hide()
+        Switches the "hidden"
+        attribute of the animal to the opposite value.
+    """
+
+    def hide(self) -> None:
+        """
+        Switches the "hidden" attribute of the animal to the opposite value.
+        :return: None
+        """
+        self.hidden = not self.hidden
+
+
+class Carnivore(Animal):
+    """
+        Represents a Carnivore animal.
+
+        Attributes:
+        ----------
+        name : str
+            the name of the animal
+        health : int
+            the health points of the animal
+        hidden : bool
+            the hiding status of the animal
+
+        Methods:
+        -------
+        bite()
+            Takes a Herbivore instance and decreases its "health"
+            attribute by 50 pts.
+        """
+
+    @staticmethod
+    def bite(herbivore: Herbivore) -> None:
+        """
+        Takes a Herbivore instance and decreases its "health"
+        attribute by 50 pts.
+        Removes the Herbivore instance out of "Animal.alive"
+        class attribute if its "health" <= 0.
+        The method does not work against another Carnivore instance,
+        or if the Herbivore's "hidden" attribute is currently True.
+        :param herbivore: Herbivore, mandatory
+            A Herbivore instance
+        :return: None
+        """
+        if isinstance(herbivore, Herbivore) and not herbivore.hidden:
+            herbivore.health -= 50
+        if herbivore.health <= 0:
+            Animal.alive.remove(herbivore)