How to use the exifread.utils.make_string function in ExifRead

"""
Makernote (proprietary) tag definitions for FujiFilm.

http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/FujiFilm.html
"""

from ...utils import make_string

TAGS = {
    0x0000: ('NoteVersion', make_string),
    0x0010: ('InternalSerialNumber', ),
    0x1000: ('Quality', ),
    0x1001: ('Sharpness', {
        0x1: 'Soft',
        0x2: 'Soft',
        0x3: 'Normal',
        0x4: 'Hard',
        0x5: 'Hard2',
        0x82: 'Medium Soft',
        0x84: 'Medium Hard',
        0x8000: 'Film Simulation'
    }),
    0x1002: ('WhiteBalance', {
        0x0: 'Auto',
        0x100: 'Daylight',
        0x200: 'Cloudy',

ret_str = '+'
    step = seq[2]  # Assume third value means the step size
    whole = a / step
    a = a % step
    if whole != 0:
        ret_str = '%s%s ' % (ret_str, str(whole))
    if a == 0:
        ret_str += 'EV'
    else:
        r = Ratio(a, step)
        ret_str = ret_str + r.__repr__() + ' EV'
    return ret_str

# Nikon E99x MakerNote Tags
TAGS_NEW = {
    0x0001: ('MakernoteVersion', make_string),  # Sometimes binary
    0x0002: ('ISOSetting', make_string),
    0x0003: ('ColorMode', ),
    0x0004: ('Quality', ),
    0x0005: ('Whitebalance', ),
    0x0006: ('ImageSharpening', ),
    0x0007: ('FocusMode', ),
    0x0008: ('FlashSetting', ),
    0x0009: ('AutoFlashMode', ),
    0x000B: ('WhiteBalanceBias', ),
    0x000C: ('WhiteBalanceRBCoeff', ),
    0x000D: ('ProgramShift', ev_bias),
    # Nearly the same as the other EV vals, but step size is 1/12 EV (?)
    0x000E: ('ExposureDifference', ev_bias),
    0x000F: ('ISOSelection', ),
    0x0010: ('DataDump', ),
    0x0011: ('NikonPreview', ),

0x8825: ('GPSInfo', GPS_INFO),  # GPS tags
    0x8827: ('ISOSpeedRatings', ),
    0x8828: ('OECF', ),
    0x8830: ('SensitivityType', {
        0: 'Unknown',
        1: 'Standard Output Sensitivity',
        2: 'Recommended Exposure Index',
        3: 'ISO Speed',
        4: 'Standard Output Sensitivity and Recommended Exposure Index',
        5: 'Standard Output Sensitivity and ISO Speed',
        6: 'Recommended Exposure Index and ISO Speed',
        7: 'Standard Output Sensitivity, Recommended Exposure Index and ISO Speed'
    }),
    0x8832: ('RecommendedExposureIndex', ),
    0x8833: ('ISOSpeed', ),
    0x9000: ('ExifVersion', make_string),
    0x9003: ('DateTimeOriginal', ),
    0x9004: ('DateTimeDigitized', ),
    0x9101: ('ComponentsConfiguration', {
        0: '',
        1: 'Y',
        2: 'Cb',
        3: 'Cr',
        4: 'Red',
        5: 'Green',
        6: 'Blue'
    }),
    0x9102: ('CompressedBitsPerPixel', ),
    0x9201: ('ShutterSpeedValue', ),
    0x9202: ('ApertureValue', ),
    0x9203: ('BrightnessValue', ),
    0x9204: ('ExposureBiasValue', ),