Creating dynamic form on a Django TextField containing one or more columns

gistfile1.py

### on my forms.py, a function to generate this form
def make_revision_form(account):
    revision_type = account.program.revision_type  
    hints = revision_type.get_hints()
    fields = {'revision_field': forms.CharField(widget=forms.HiddenInput, required=False),
              'account_id': forms.CharField(widget=forms.HiddenInput, required=False, initial=account.id)}
    for i, hint in enumerate( hints ):
        fields['grade_%d'%(len(hints)-i)] = forms.CharField(
                label="Critério %s"%chr(i+65), help_text=hint, 
                required=True)
    return type('RevisionForm', (forms.BaseForm,), { 'base_fields': fields })


### my revision type model
class RevisionType(models.Model):
    class Meta:
        verbose_name = _(u"Peso de notas para revisões de inscrições")
    name = models.TextField(verbose_name=_(u'Nome do método de pontuação'))
    weights = models.TextField(verbose_name=_(u'Peso das notas de cada campo, separadas por ponto-vírgula'))
    hints = models.TextField(verbose_name=_(u'Especificações sobre o que é cada campo'))
    
    def get_hints(self):
        return [ hint.strip() for hint in self.hints.split(";")]
    
    def get_weights(self):        
        return [ Decimal(weight.strip()) for weight in self.weights.split(";")]

    def __unicode__(self):
        return self.name