def define(name, default=None, type=None, help=None, metavar=None,
           multiple=False, group=None, callback=None):
    return options.define(name, default=default, type=type, help=help,
                          metavar=metavar, multiple=multiple, group=group,
                          callback=callback)
Setup the database backend.
dataset/ETHPy150Open D-L/SimpleBookMarks/src/tornado/options.py/define--crossover with--dataset/ETHPy150Open getlogbook/logbook/logbook/ticketing.py/BackendBase.setup_backend