You can do the following:
#forms.py
class ProductForm(ModelForm):
class Meta:
model = Product
exclude = ('updated', 'created')
def __init__(self, *args, **kwargs):
super(ProductForm, self).__init__(*args, **kwargs)
self.fields['description'].widget = TextInput(attrs={
'id': 'myCustomId',
'class': 'myCustomClass',
'name': 'myCustomName',
'placeholder': 'myCustomPlaceholder'})