Add dataclass example for Person with date_of_birth and is_adult method

Author: AFatmaa

dataclasses_.py

@@ -0,0 +1,23 @@
+from dataclasses import dataclass
+from datetime import date
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    date_of_birth: date
+    preferred_operating_system: str
+
+    def is_adult(self) -> bool:
+        today = date.today()
+        age = today.year - self.date_of_birth.year - (
+            (today.month, today.day) < (self.date_of_birth.month, self.date_of_birth.day)
+        )
+        return age >= 18
+
+
+imran = Person("Imran", date(2002, 5, 15), "Ubuntu")
+imran2 = Person("Imran", date(2002, 5, 15), "Ubuntu")
+
+print(imran)          # Person(name='Imran', date_of_birth=datetime.date(2002, 5, 15), preferred_operating_system='Ubuntu')
+print(imran == imran2)  # True
+print(imran.is_adult())  # True