def names(self):
        return self._attrnames
SQLite3 doesn't support constraints
dataset/ETHPy150Open scipy/scipy/scipy/io/arff/arffread.py/MetaData.names--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/db/backends/sqlite3/creation.py/DatabaseCreation.sql_remove_table_constraints