Inappropriate Exception for queries to Ukranian

Instead of appropriately raising DeepLException: Bad request, message: Value for 'target_lang' not supported., the request throws TooManyRequestsException: Too many requests, DeepL servers are currently experiencing high load, message: Too many requests after ~10s of sleeping. It would be much better to raise early that it is not currently supported.

In [21]: translator.translate_text("hrdinum slava", source_lang='cs', target_lang="uk")        
2022-08-30 12:32:47,545 deepl        INFO     Request to DeepL API method=POST url=https://api-free.deepl.com/v2/translate
2022-08-30 12:32:47,828 deepl        INFO     Starting retry 1 for request POST https://api-free.deepl.com/v2/translate after sleeping for 0.72 seconds. 
2022-08-30 12:32:48,711 deepl        INFO     Starting retry 2 for request POST https://api-free.deepl.com/v2/translate after sleeping for 1.39 seconds. 
2022-08-30 12:32:50,287 deepl        INFO     Starting retry 3 for request POST https://api-free.deepl.com/v2/translate after sleeping for 2.57 seconds. 
2022-08-30 12:32:52,963 deepl        INFO     Starting retry 4 for request POST https://api-free.deepl.com/v2/translate after sleeping for 4.27 seconds. 
2022-08-30 12:32:57,410 deepl        INFO     Starting retry 5 for request POST https://api-free.deepl.com/v2/translate after sleeping for 4.98 seconds. 
2022-08-30 12:33:02,605 deepl        INFO     DeepL API response status_code=429 url=https://api-free.deepl.com/v2/translate
---------------------------------------------------------------------------
TooManyRequestsException                  Traceback (most recent call last)
Input In [21], in <module>
----> 1 translator.translate_text("hrdinum slava", source_lang='cs', target_lang="uk")

File ~/Git/Supernova/venv/lib/python3.9/site-packages/deepl/translator.py:769, in Translator.translate_text(self, text, source_lang, target_lang, split_sentences, preserve_formatting, formality, glossary, tag_handling, outline_detection, non_splitting_tags, splitting_tags, ignore_tags)
    763     request_data["ignore_tags"] = join_tags(ignore_tags)
    765 status, content, json = self._api_call(
    766     "v2/translate", data=request_data
    767 )
--> 769 self._raise_for_status(status, content, json)
    771 translations = json.get("translations", [])
    772 output = []

File ~/Git/Supernova/venv/lib/python3.9/site-packages/deepl/translator.py:560, in Translator._raise_for_status(self, status_code, content, json, glossary, downloading_document)
    558     raise DeepLException(f"Bad request{message}")
    559 elif status_code == http.HTTPStatus.TOO_MANY_REQUESTS:
--> 560     raise TooManyRequestsException(
    561         "Too many requests, DeepL servers are currently experiencing "
    562         f"high load{message}"
    563     )
    564 elif status_code == http.HTTPStatus.SERVICE_UNAVAILABLE:
    565     if downloading_document:

TooManyRequestsException: Too many requests, DeepL servers are currently experiencing high load, message: Too many requests

[daniel-jones-deepl]

Hi @jvacek Jonas and @gantoin Antoine, yes DeepL supports Ukrainian now.

Yes it was caused by the backend API not this Python library. We will fix the issue, so it should not happen again next time we release a new language.

[jvacek]

This might actually be an issue for the backend instead of the Python package actually, I would not be surprised if the response being given by the API is the cause of the exception being faulty. i.e. I would assume the other implementations of the deepl package would suffer from a similar thing