text: 
  from django import forms
  from django.conf import settings
  from django.utils.html import escape
  from django.utils.safestring import mark_safe
  from django.utils.encoding import force_unicode
  from django.contrib.admin.util import flatten_fieldsets
  from django.contrib.contenttypes.models import ContentType
  from django.utils.translation import ugettext_lazy as _
  
  ACTION_CHECKBOX_NAME = '_selected_action'
  
  class ActionForm(forms.Form):
      action = forms.ChoiceField(label=_('Action:'))
  
  checkbox = forms.CheckboxInput({'class': 'action-select'}, lambda value: False)
  
  class AdminForm(object):
      def __init__(self, form, fieldsets, prepopulated_fields):
          self.form, self.fieldsets = form, normalize_fieldsets(fieldsets)
          self.prepopulated_fields = [{
              'field': form[field_name],
              'dependencies': [form[f] for f in dependencies]
          } for field_name, dependencies in prepopulated_fields.items()]
  
      def __iter__(self):
          for name, options in self.fieldsets:
              yield Fieldset(self.form, name, **options)
  
      def first_field(self):
          try:
              fieldset_name, fieldset_options = self.fieldsets[0]
              field_name = fieldset_options['fields'][0]
              if not isinstance(field_name, basestring):
                  field_name = field_name[0]
              return self.form[field_name]
          except (KeyError, IndexError):
              pass
          try:
              return iter(self.form).next()
          except StopIteration:
              return None
  
      def _media(self):
          media = self.form.media
          for fs in self:
              media = media + fs.media
          return media
      media = property(_media)
  
  class Fieldset(object):
      def __init__(self, form, name=None, fields=(), classes=(), description=None):
          self.form = form
          self.name, self.fields = name, fields
          self.classes = u' '.join(classes)
          self.description = description
  
      def _media(self):
          if 'collapse' in self.classes:
              return forms.Media(js=['%sjs/admin/CollapsedFieldsets.js' % settings.ADMIN_MEDIA_PREFIX])
          return forms.Media()
      media = property(_media)
  
      def __iter__(self):
          for field in self.fields:
              yield Fieldline(self.form, field)
  
  class Fieldline(object):
      def __init__(self, form, field):
          self.form = form # A django.forms.Form instance
          if isinstance(field, basestring):
              self.fields = [field]
          else:
              self.fields = field
  
      def __iter__(self):
          for i, field in enumerate(self.fields):
              yield AdminField(self.form, field, is_first=(i == 0))
  
      def errors(self):
          return mark_safe(u'\n'.join([self.form[f].errors.as_ul() for f in self.fields]).strip('\n'))
  
  class AdminField(object):
      def __init__(self, form, field, is_first):
          self.field = form[field] # A django.forms.BoundField instance
          self.is_first = is_first # Whether this field is first on the line
          self.is_checkbox = isinstance(self.field.field.widget, forms.CheckboxInput)
  
      def label_tag(self):
          classes = []
          if self.is_checkbox:
              classes.append(u'vCheckboxLabel')
              contents = force_unicode(escape(self.field.label))
          else:
              contents = force_unicode(escape(self.field.label)) + u':'
          if self.field.field.required:
              classes.append(u'required')
          if not self.is_first:
              classes.append(u'inline')
          attrs = classes and {'class': u' '.join(classes)} or {}
          return self.field.label_tag(contents=contents, attrs=attrs)
  
  class InlineAdminFormSet(object):
      """
      A wrapper around an inline formset for use in the admin system.
      """
      def __init__(self, inline, formset, fieldsets):
          self.opts = inline
          self.formset = formset
          self.fieldsets = fieldsets
  
      def __iter__(self):
          for form, original in zip(self.formset.initial_forms, self.formset.get_queryset()):
              yield InlineAdminForm(self.formset, form, self.fieldsets, self.opts.prepopulated_fields, original)
          for form in self.formset.extra_forms:
              yield InlineAdminForm(self.formset, form, self.fieldsets, self.opts.prepopulated_fields, None)
  
      def fields(self):
          fk = getattr(self.formset, "fk", None)
          for field_name in flatten_fieldsets(self.fieldsets):
              if fk and fk.name == field_name:
                  continue
              yield self.formset.form.base_fields[field_name]
  
      def _media(self):
          media = self.opts.media + self.formset.media
          for fs in self:
              media = media + fs.media
          return media
      media = property(_media)
  
  class InlineAdminForm(AdminForm):
      """
      A wrapper around an inline form for use in the admin system.
      """
      def __init__(self, formset, form, fieldsets, prepopulated_fields, original):
          self.formset = formset
          self.original = original
          if original is not None:
              self.original_content_type_id = ContentType.objects.get_for_model(original).pk
          self.show_url = original and hasattr(original, 'get_absolute_url')
          super(InlineAdminForm, self).__init__(form, fieldsets, prepopulated_fields)
  
      def __iter__(self):
          for name, options in self.fieldsets:
              yield InlineFieldset(self.formset, self.form, name, **options)
  
      def has_auto_field(self):
          if self.form._meta.model._meta.has_auto_field:
              return True
          # Also search any parents for an auto field.
          for parent in self.form._meta.model._meta.get_parent_list():
              if parent._meta.has_auto_field:
                  return True
          return False
  
      def field_count(self):
          # tabular.html uses this function for colspan value.
          num_of_fields = 0
          if self.has_auto_field():
              num_of_fields += 1
          num_of_fields += len(self.fieldsets[0][1]["fields"])
          if self.formset.can_order:
              num_of_fields += 1
          if self.formset.can_delete:
              num_of_fields += 1
          return num_of_fields
  
      def pk_field(self):
          return AdminField(self.form, self.formset._pk_field.name, False)
  
      def fk_field(self):
          fk = getattr(self.formset, "fk", None)
          if fk:
              return AdminField(self.form, fk.name, False)
          else:
              return ""
  
      def deletion_field(self):
          from django.forms.formsets import DELETION_FIELD_NAME
          return AdminField(self.form, DELETION_FIELD_NAME, False)
  
      def ordering_field(self):
          from django.forms.formsets import ORDERING_FIELD_NAME
          return AdminField(self.form, ORDERING_FIELD_NAME, False)
  
  class InlineFieldset(Fieldset):
      def __init__(self, formset, *args, **kwargs):
          self.formset = formset
          super(InlineFieldset, self).__init__(*args, **kwargs)
  
      def __iter__(self):
          fk = getattr(self.formset, "fk", None)
          for field in self.fields:
              if fk and fk.name == field:
                  continue
              yield Fieldline(self.form, field)
  
  class AdminErrorList(forms.util.ErrorList):
      """
      Stores all errors for the form/formsets in an add/change stage view.
      """
      def __init__(self, form, inline_formsets):
          if form.is_bound:
              self.extend(form.errors.values())
              for inline_formset in inline_formsets:
                  self.extend(inline_formset.non_form_errors())
                  for errors_in_inline_form in inline_formset.errors:
                      self.extend(errors_in_inline_form.values())
  
  def normalize_fieldsets(fieldsets):
      """
      Make sure the keys in fieldset dictionaries are strings. Returns the
      normalized data.
      """
      result = []
      for name, options in fieldsets:
          result.append((name, normalize_dictionary(options)))
      return result
  
  def normalize_dictionary(data_dict):
      """
      Converts all the keys in "data_dict" to strings. The keys must be
      convertible using str().
      """
      for key, value in data_dict.items():
          if not isinstance(key, str):
              del data_dict[key]
              data_dict[str(key)] = value
      return data_dict
  
  