old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from django import forms
  from django.utils.translation import ugettext_lazy as _
  
  from .models import Channel
  
  
  class ChannelAdminForm(forms.ModelForm):
      layout = forms.ChoiceField(choices=(('default', _('Default'))))
  
      class Meta:
          model = Channel
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from django import forms
  from django.utils.translation import ugettext_lazy as _
  
  from .models import Channel
  
  
  class ChannelAdminForm(forms.ModelForm):
      layout = forms.ChoiceField(choices=(('default', _('Default')),))
  
      class Meta:
          model = Channel
  
subject: Fix channel form tuple, 'too many values to unpack'