def chunk_iterator(gff_iterator):
    for gff in gff_iterator:
        yield [gff, ]
Creates an SQLAlchemy engine object for the app and persistent store given.
dataset/ETHPy150Open CGATOxford/cgat/CGAT/GTF.py/chunk_iterator--crossover with--dataset/ETHPy150Open tethysplatform/tethys/tethys_apps/base/persistent_store.py/get_persistent_store_engine