Django widget def format_output()

class NameWidget(forms.MultiWidget):
    """
    Custom widget for Custom Field Name Field
    """
    def __init__(self):
        widgets = (
                    forms.TextInput(attrs={}),
                    forms.TextInput(attrs={}),
                    forms.TextInput(attrs={})
                )
        super(NameWidget, self).__init__(widgets)
    
    def decompress(self, value):
        if value:
            return value
        return [None,None,None]

    def format_output(self,rendered_widgets):
        """
        Customize widget rendering
        """
        widget_context = {'first_name':rendered_widgets[0],'middle_name':rendered_widgets[1],'last_name':rendered_widgets[2]}
        return render_to_string('forms/namefield.html',widget_context)
        
class NameField(forms.MultiValueField):
    """
    Custom field to take user inputs of name
    """
    widget = NameWidget()
    def __init__(self):
        fields = (
                    forms.CharField(label=_('First Name'), max_length=50),
                    forms.CharField(label=_('Middle Name'), max_length=50),
                    forms.CharField(label=_('Last Name'), max_length=50)
                )
        super(NameField, self).__init__(fields, required=False)
    
    def compress(self, data_list):
        if data_list:
            return data_list
        return None

    def clean(self, value, initial=None):
        value = super(NameField, self).clean(value)
        return value