non-django-contactform.py

# Implementation without the metaclass
class CharField(object):
    def __init__(self, form, text=None):
        self.form = form
        self.text = text
    def __str__(self):
        return self.text
    def is_valid_email(self):
        return True if self.text.find('@')>0 else False
    def getform(self):
        return self.form

class Form(object):
    fields = {}

class ContactForm(Form):
    def __init__(self, data):
        self.fields['first_name'] = CharField(self, data.get('first_name', ''))
        self.fields['last_name'] = CharField(self, data.get('last_name', ''))
        self.fields['email'] = CharField(self, data.get('email', ''))
        
c = ContactForm({'first_name':'John', 
                 'last_name': 'Bond',
                 'email': 'jbond@jb.com'})

# The following line prints 
# John Bond True
print c.fields['first_name'], c.fields['last_name'], c.fields['email'].is_valid_email()