def __init__(self, *args, **kwargs):
        try:
            self.extra_url_kwargs = kwargs.pop('extra_url_kwargs')
        except __HOLE__:
            msg = "DrillDownHyperlinkedIdentityField requires 'extra_url_args' argument"
            raise ValueError(msg)

        super(DrillDownHyperlinkedIdentityField, self).__init__(*args, **kwargs)
dataset/ETHPy150Open django-oscar/django-oscar-api/oscarapi/utils.py/DrillDownHyperlinkedIdentityField.__init__