customized form rendering in Django: RadioSelect with labels on the left

Django CustomRadioSelect

#   forms.py

from django import forms
from django.core import validators
from django.forms.widgets import RadioSelect,HiddenInput
from django.utils.safestring import mark_safe
from django.utils.encoding import StrAndUnicode, force_unicode
from django.utils.html import escape, conditional_escape

class CustomRadioInput(forms.widgets.RadioInput):
    def __unicode__(self):
        if 'id' in self.attrs:
            label_for = ' for="%s_%s"' % (self.attrs['id'], self.index)
        else:
            label_for = ''
        choice_label = conditional_escape(force_unicode(self.choice_label))
        return mark_safe(u'<label%s>%s</label> %s' % (label_for, choice_label, self.tag()))

class CustomRadioRenderer(forms.widgets.RadioFieldRenderer):
    def __iter__(self):
        for i, choice in enumerate(self.choices):
            yield CustomRadioInput(self.name, self.value, self.attrs.copy(), choice, i)
    def __getitem__(self, idx):
        choice = self.choices[idx] # Let the IndexError propogate
        return CustomRadioInput(self.name, self.value, self.attrs.copy(), choice, idx)
    def render(self):
        return_value = mark_safe(u'\n'.join([u'%s<br>' % force_unicode(w) for w in self]))
        return return_value

class CustomRadioSelect(forms.widgets.RadioSelect):
    renderer = CustomRadioRenderer

class NewItemForm(forms.Form):
    radio_choices = (("new_quote","Add a source"),("new_quote_and_original","Add bilingual source"),("",None))
    new = forms.ChoiceField(widget=CustomRadioSelect(),choices=radio_choices)
    ordinal = forms.IntegerField(widget=HiddenInput)