Django model property for computed fields

                  from django.db import models
from django.utils import timezone
from datetime import date


class Person(models.Model):
    first_name = models.CharField(max_length=50)
    last_name = models.CharField(max_length=50)
    date_of_birth = models.DateField()
    email = models.EmailField()

    @property
    def full_name(self):
        """Computed full name from first and last."""
        return f'{self.first_name} {self.last_name}'

    @property
    def age(self):
        """Calculate current age from date of birth."""
        today = date.today()
        age = today.year - self.date_of_birth.year
        if today.month < self.date_of_birth.month or \
           (today.month == self.date_of_birth.month and
            today.day < self.date_of_birth.day):
            age -= 1
        return age

    @property
    def email_domain(self):
        """Extract domain from email address."""
        return self.email.split('@')[1] if '@' in self.email else ''

    def __str__(self):
        return self.full_name