environment/lib/python2.7/site-packages/IPython/parallel/controller/sqlitedb.py
def _defaults(self, keys=None):
        """create an empty record"""
        d = {}
        keys = self._keys if keys is None else keys
        for key in keys:
            d[key] = None
        return d
def _defaults(self, keys=None):
        """create an empty record"""
        d = {}
        keys = self._keys if keys is None else keys
        for key in keys:
            d[key] = None
        return d
create an empty record