====== Pro Django ======
Book: Pro Django 2nd ed. Apress


Base class 

    from django.db import models
    
    class Contact(models.Model):
      name = models.CharField(max_length=255)
      email = models.EmailField()
 
Attribute Classes (CharField) look here:
   
    vim refman_env/lib/python2.7/site-packages/django/db/models/fields/__init__.py