def list_instruments(self, instruments, start_time=None, end_time=None, freq='day', as_list=False):
    return Inst.list_instruments(instruments, start_time, end_time, freq, as_list)
def list_instruments(self, instruments, start_time=None, end_time=None, freq='day', as_list=False):
    return Inst.list_instruments(instruments, start_time, end_time, freq, as_list)