models.py

from django.db import models

class People(models.Model):
    """
    >>> p = People()
    >>> p.save()
    >>> p.name
    '123'
    """
    name = models.CharField(blank=True, max_length=100)
    
    def save(self):
        a = "123"
        self.name = a
        super(People,self).save()