List the names of OpenType (.otf) fonts in a directory (and optionally rename them accordingly).

list_otf_font_names.py

#!/usr/bin/env python

""" Taken from http://stackoverflow.com/a/23703564/183995 """

import os, sys, argparse

from bitstring import BitStream

parser = argparse.ArgumentParser()
parser.add_argument('folder')
parser.add_argument('--rename', action='store_true')
args = parser.parse_args()

font_path = args.folder
font_count = 0

for file in os.listdir(font_path):
    if file.lower().endswith(".otf"):
        source_file_name = os.path.join(font_path, file)
        font = BitStream(filename=source_file_name)
        pos = font.find('0x00010101', bytealigned=True)
        if not pos:
            sys.stderr.write("Couldn't read the font file %s" % (source_file_name))
            continue # this skips bad otf files ;-)
        font.pos = pos[0]-16
        fontstring = font.read(8).hex
        new = pos[0]+4 #afaik bitstring has no regex/wildcards support...
        while fontstring != "04": #so we do this similar... 04 ?? 00 01 01 01 [String] 00 01
            pos = font.find('0x00010101',new, bytealigned=True)
            font.pos = pos[0]-16
            fontstring = font.read(8).hex
            new = pos[0]+4
        font_count += 1
        pos2 = font.find('0x0001',pos[0]+5, bytealigned=True)
        length = pos2[0]-pos[0]-40
        font.pos = pos[0]+40
        fontstring = font.read(length)
        hex_data = fontstring.hex
        ascii_string = ""
        x = 0
        y = 2
        l = len(hex_data)
        while y <= l:
            ascii_string += chr(int(hex_data[x:y], 16))
            x += 2
            y += 2
        print (ascii_string)
        #the next three lines if you want autorename
        if args.rename:
            newfile = os.path.join(font_path, ascii_string+".otf")
            if not os.path.isfile(newfile):
                os.rename(source_file_name, newfile)
print()
print(font_count, "Fonts")