Django query Advanced

I am trying a query like this:

result = json.dumps([a.get_json() for a in Player.objects.filter((Q(name=namepost) | Q(surname="Coimbra")))])     return HttpResponse (result, content_type = 'application / json')

But it gives me the following error: Not a query object: (AND: ('surname', 'Coimbra'), ('name', u'Rui ')). Did you intend to use key = value?

get_json def (self):        return {          'name': self.name,          'surname': self.surname,          'country': [{'name': b.name} for b in self.country]         }
If I do well
result = json.dumps([a.get_json() for a in Player.objects.filter(name=namepost)])
works well
What am I doing wrong? Someone can help me?

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