Finding out what characters a given font supports

Question

How do I extract the list of supported Unicode characters from a TrueType or embedded OpenType font on Linux?

Is there a tool or a library I can use to process a .tt

Answer 1

If you want to get all characters supported by a font, you may use the following (based on Janus's answer)

from fontTools.ttLib import TTFont

def get_font_characters(font_path):
    with TTFont(font_path) as font:
        characters = {chr(y[0]) for x in font["cmap"].tables for y in x.cmap.items()}
    return characters