task completed

app/main.py

@@ -1 +1,60 @@
-# write your code here
+from typing import List
+
+
+class Animal:
+    """
+    Class representing an animal.
+    """
+    alive: List["Animal"] = []
+
+    def __init__(self, name: str, health: int = 100) -> None:
+        """
+        Initialize an animal with a name and health.
+        """
+        self.name = name
+        self.health = health
+        self.hidden = False
+        self.alive.append(self)
+
+    def __repr__(self) -> str:
+        """
+        Represent the animal as a string.
+        """
+        return f"{{Name: {self.name}," \
+               f" Health: {self.health}," \
+               f" Hidden: {self.hidden}}}"
+
+    def check_health(self) -> None:
+        """
+        Check the health of the animal.
+        If the health is 0 or less, remove the animal from the alive list.
+        """
+        if self.health <= 0:
+            self.__class__.alive.remove(self)
+
+
+class Herbivore(Animal):
+    """
+    Class representing a herbivore, which is a type of animal.
+    """
+
+    def hide(self) -> None:
+        """
+        Change the hidden status of the herbivore.
+        """
+        self.hidden = not self.hidden
+
+
+class Carnivore(Animal):
+    """
+    Class representing a carnivore, which is a type of animal.
+    """
+
+    def bite(self, other: "Herbivore") -> None:
+        """
+        Bite another herbivore, decreasing its health by 50.
+        If the other animal is not a herbivore or is hidden, do nothing.
+        """
+        if isinstance(other, Herbivore) and not other.hidden:
+            other.health -= 50
+            other.check_health()