Format generics-exercise1.py with Black and refactor age property

- Add @Property decorator to age() method for attribute-like access
- Format long conditional statement across multiple lines
- Add blank lines between logical sections for readability
- Change child.age() method call to child.age property access
- Improve code formatting consistency with Black formatter
- Maintain all functionality while improving code style

Author: Iswanna

prep/generics-exercise1.py

@@ -2,29 +2,35 @@
 from typing import List
 from datetime import date
 
+
 @dataclass(frozen=True)
 class Person:
     name: str
     date_of_birth: date
     children: List["Person"]
 
+    @property
     def age(self) -> int:
         today = date.today()
         age = today.year - self.date_of_birth.year
-        if (today.month, today.day) < (self.date_of_birth.month, self.date_of_birth.day):
+        if (today.month, today.day) < (
+            self.date_of_birth.month,
+            self.date_of_birth.day,
+        ):
             age -= 1
         return age
 
+
 fatma = Person(name="Fatma", date_of_birth=date(2015, 7, 22), children=[])
 aisha = Person(name="Aisha", date_of_birth=date(2018, 3, 10), children=[])
 
 imran = Person(name="Imran", date_of_birth=date(1985, 5, 15), children=[fatma, aisha])
 
+
 def print_family_tree(person: Person) -> None:
     print(person.name)
     for child in person.children:
-        print(f"- {child.name} ({child.age()})")
-
-print_family_tree(imran)
+        print(f"- {child.name} ({child.age})")
 
 
+print_family_tree(imran)