feat: Add new language codes

Author: Lucas Mathis

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Added
+- Added new language constants from January 2026 API release of 81 new languages.
 
 ## [1.28.0] - 2026-02-05
 ### Changed

deepl/api_data.py

@@ -250,42 +250,133 @@ def __str__(self):
     @staticmethod
     def remove_regional_variant(language: Union[str, "Language"]) -> str:
         """Removes the regional variant from a language, e.g. EN-US gives EN"""
-        return str(language).upper()[0:2]
-
+        dash_index = str(language).find("-")
+        if dash_index != -1:
+            return str(language).upper()[0:dash_index]
+        else:
+            return str(language).upper()
+
+    ACEHNESE = "ace"
+    AFRIKAANS = "af"
+    ARAGONESE = "an"
     ARABIC = "ar"
+    ASSAMESE = "as"
+    AYMARA = "ay"
+    AZERBAIJANI = "az"
+    BASHKIR = "ba"
+    BELARUSIAN = "be"
     BULGARIAN = "bg"
+    BHOJPURI = "bho"
+    BENGALI = "bn"
+    BRETON = "br"
+    BOSNIAN = "bs"
+    CATALAN = "ca"
+    CEBUANO = "ceb"
+    KURDISH_SORANI = "ckb"
     CZECH = "cs"
+    WELSH = "cy"
     DANISH = "da"
     GERMAN = "de"
     GREEK = "el"
     ENGLISH = "en"  # Only usable as a source language
     ENGLISH_BRITISH = "en-GB"  # Only usable as a target language
     ENGLISH_AMERICAN = "en-US"  # Only usable as a target language
+    ESPERANTO = "eo"
     SPANISH = "es"
+    SPANISH_LATIN_AMERICAN = "es-419"  # Only usable as a target language
     ESTONIAN = "et"
+    BASQUE = "eu"
+    PERSIAN = "fa"
     FINNISH = "fi"
     FRENCH = "fr"
+    IRISH = "ga"
+    GALICIAN = "gl"
+    GUARANI = "gn"
+    KONKANI = "gom"
+    GUJARATI = "gu"
+    HAUSA = "ha"
+    HEBREW = "he"
+    HINDI = "hi"
+    CROATIAN = "hr"
+    HAITIAN_CREOLE = "ht"
     HUNGARIAN = "hu"
+    ARMENIAN = "hy"
     INDONESIAN = "id"
+    IGBO = "ig"
+    ICELANDIC = "is"
     ITALIAN = "it"
     JAPANESE = "ja"
+    JAVANESE = "jv"
+    GEORGIAN = "ka"
+    KAZAKH = "kk"
+    KURDISH_KURMANJI = "kmr"
     KOREAN = "ko"
+    KYRGYZ = "ky"
+    LATIN = "la"
+    LUXEMBOURGISH = "lb"
+    LOMBARD = "lmo"
+    LINGALA = "ln"
     LITHUANIAN = "lt"
     LATVIAN = "lv"
+    MAITHILI = "mai"
+    MALAGASY = "mg"
+    MAORI = "mi"
+    MACEDONIAN = "mk"
+    MALAYALAM = "ml"
+    MONGOLIAN = "mn"
+    MARATHI = "mr"
+    MALAY = "ms"
+    MALTESE = "mt"
+    BURMESE = "my"
     NORWEGIAN = "nb"
+    NEPALI = "ne"
     DUTCH = "nl"
+    OCCITAN = "oc"
+    OROMO = "om"
+    PUNJABI = "pa"
+    PANGASINAN = "pag"
+    KAPAMPANGAN = "pam"
     POLISH = "pl"
+    DARI = "prs"
+    PASHTO = "ps"
     PORTUGUESE = "pt"  # Only usable as a source language
     PORTUGUESE_BRAZILIAN = "pt-BR"  # Only usable as a target language
     PORTUGUESE_EUROPEAN = "pt-PT"  # Only usable as a target language
+    QUECHUA = "qu"
     ROMANIAN = "ro"
     RUSSIAN = "ru"
+    SANSKRIT = "sa"
+    SICILIAN = "scn"
     SLOVAK = "sk"
     SLOVENIAN = "sl"
+    ALBANIAN = "sq"
+    SERBIAN = "sr"
+    SESOTHO = "st"
+    SUNDANESE = "su"
     SWEDISH = "sv"
+    SWAHILI = "sw"
+    TAMIL = "ta"
+    TELUGU = "te"
+    TAJIK = "tg"
+    THAI = "th"
+    TURKMEN = "tk"
+    TAGALOG = "tl"
+    TSWANA = "tn"
     TURKISH = "tr"
+    TSONGA = "ts"
+    TATAR = "tt"
     UKRAINIAN = "uk"
+    URDU = "ur"
+    UZBEK = "uz"
+    VIETNAMESE = "vi"
+    WOLOF = "wo"
+    XHOSA = "xh"
+    YIDDISH = "yi"
+    CANTONESE = "yue"
     CHINESE = "zh"
+    CHINESE_SIMPLIFIED = "zh-Hans"  # Only usable as a target language
+    CHINESE_TRADITIONAL = "zh-Hant"  # Only usable as a target language
+    ZULU = "zu"
 
 
 class GlossaryLanguagePair:

tests/test_general.py

@@ -20,6 +20,21 @@ def test_version():
     assert "1.28.0" == deepl.__version__
 
 
+def test_remove_regional_variant():
+    for lang, expected in [
+        ("EN-US", "EN"),
+        ("en-GB", "EN"),
+        ("de-AT", "DE"),
+        (deepl.Language.ENGLISH_AMERICAN, "EN"),
+        (deepl.Language.ENGLISH_BRITISH, "EN"),
+        (deepl.Language.GERMAN, "DE"),
+        (deepl.Language.ACEHNESE, "ACE"),
+        (deepl.Language.KURDISH_KURMANJI, "KMR"),
+        (deepl.Language.SPANISH_LATIN_AMERICAN, "ES"),
+    ]:
+        assert deepl.Language.remove_regional_variant(lang) == expected
+
+
 @pytest.mark.parametrize(
     "lang",
     [k for k in example_text.keys()],