def __init__(self, *args, **kwargs):
        self.transcript_key = kwargs.pop('transcript_key', 'transcript_id')
        self.gene_key = kwargs.pop('gene_key', 'gene_id')
        self.subfeature = kwargs.pop('subfeature', 'exon')
        super(_GTFDBCreator, self).__init__(*args, **kwargs)
Set up the database and create a connection pool pointing at it.
dataset/ETHPy150Open daler/gffutils/gffutils/create.py/_GTFDBCreator.__init__--crossover with--dataset/ETHPy150Open twisted/twisted/twisted/test/test_adbapi.py/ADBAPITestBase.extraSetUp