Apply widgets to many fields in django form easily and DRYly

gistfile1.py

class ...
    class Meta:
        _textarea = forms.Textarea(attrs={'cols': 40, 'rows': 5})
        model = models.MyModel
        widgets = {
            'field1': _textarea,
            'field2': _textarea,
            'field3': _textarea,
            'field4': _textarea,
        }