What should be the firldname for Forms in django when a sheet?

Question

Django

I accept this name in the POST request: 'item[tags][]' via request.POST.getlist('item[tags][]') everything works fine, but when I give this to the request.POSTform I can't think of a field name:

class MyForm(forms.Form):
    item = TagField()

item, or what should be there? I can't give a name like in a POST request!