Add generics exercise

Author: AliQassab

prep-exercises/generics.py

@@ -0,0 +1,32 @@
+from dataclasses import dataclass
+from typing import List
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age: int
+    children: List["Person"]
+
+sara = Person(name="Sara", age=5, children=[])
+ahmed = Person(name="Ahmed", age=8, children=[])
+
+ali = Person(name="Ali", age=28, children=[sara])
+aya = Person(name="Aya", age=32, children=[ahmed])
+
+imran = Person(name="Imran", age=55, children=[ali, aya])
+
+def print_family_tree(person: Person) -> None:
+    print(f"{person.name} ({person.age})")
+    for child in person.children:
+        print(f"  - {child.name} ({child.age})")
+        for grandchild in child.children:
+            print(f"    - {grandchild.name} ({grandchild.age})")
+
+def count_family_members(person: Person) -> int:
+    count = 1
+    for child in person.children:
+        count += count_family_members(child)
+    return count
+
+print_family_tree(imran)
+print(f"\nTotal family members: {count_family_members(imran)}")