src/helpers.py

import pycountry

iso_encoder = {"English":"eng",
       "French":"fra",
       "Moore": "mos"}

iso_decoder = dict((v,k) for k,v in iso_encoder.items())



def encode_iso(lang:str)-> str:
    '''   Takes the name of a language and returns its ISO-3 code.   '''
    return  iso_encoder[lang]

def decode_iso(iso:str)-> str:
    '''  Takes an ISO-3 code and returns the name of the language.   '''

    if "-" in iso:
        iso, suffix = iso.split("-", 1)
    else:
        suffix = None
        
    name = pycountry.languages.get(alpha_3 = iso).name
    name = name.replace("Mossi", "Mooré").replace("Swahili (individual language)", "Swahili")

    if suffix is not None:
        name+= f" - {suffix}"
    
    return name