Language tags are not your everyday ISO standard, but instead composed of an ISO-639 language code, and an ISO-3166 country/region code (and occationally an ISO-15924 script tag for the written language).
The file is generated from Microsoft's seminal piece, [MS-LCID].pdf.
$ pip install bcp47>>> import bcp47
>>> 'dje' in bcp47.tags and 'es-DO' in bcp47.tags
True
>>> [v for k,v in bcp47.languages.items() if 'English' in k]
['en', 'en-AS', 'en-AI', 'en-AG', 'en-AU', 'en-AT', 'en-BS', 'en-BB', 'en-BE', 'en-BZ', 'en-BM', 'en-BW', 'en-IO', ...]This package only lists the most common language codes. If you want a package to parse, validate and simplify full BCP47 language tags, have a look at langcodes or langtags.
The BCP47 standard is 84 pages catering to specificity (such as de-CH-1996 and zh-CN-a-myext-x-private) while this package currently
does not. Instead a highly pragmatic approach is used (some say overly simplified)
where only the most common 900 or so language codes are listed, such as fo-DK and iu-Cans-CA.
Microsoft's language codes are used to ensure some level of pragmatism, KISS. Validation you will have to do yourself, see above for a trivial example.
Enjoy at the best of your ability!