document.py

class Document(dict):

    def __init__(self, name, *args, **kwargs):
        self._name = name
        super(Document, self).__init__(*args, **kwargs)

    def __getattr__(self, key):
        return self[key]

    def __setattr__(self, key, value):
        self[key] = value

    def __iter__(self):
        return (k for k in super(Document, self).__iter__()
                if not (isinstance(k, six.string_types) and k.startswith('_')))

    def items(self):
        return ((k, v) for k, v in super(Document, self).items()
                if not (isinstance(k, six.string_types) and k.startswith('_')))

    def values(self):
        return (v for k, v in super(Document, self).items()
                if not (isinstance(k, six.string_types) and k.startswith('_')))

    def keys(self):
        return (k for k in super(Document, self).keys()
                if not (isinstance(k, six.string_types) and k.startswith('_')))

    def __contains__(self, k):
        if isinstance(k, six.string_types) and k.startswith('_'):
            return False
        return super(Document, self).__contains(k)