syspath = '/sys/devices/ocp.*/44e0d000.tscadc/tiadc/iio:device0/'

FileName = []

for i in range(num_chan):
    TempName  = glob.glob (syspath + 'in_voltage' + args.adc[i] + '_raw')
    FileName.insert(i, TempName[0])
    try:
        if len(FileName[i]) > 0:
            f = open(FileName[i], 'r')
            f.close()
            time.sleep(0.001)
        else:
            raise UserWarning('Bad Filename')
    except (UserWarning, IOError) :
        print("Cannot read ADC input: %s" % Filename[i])
        sys.exit(1)