Enforce string-formatting with f-strings (#10980)

* First third

* Styling and fix mistake

* Quality

* All the rest

* Treat %s and %d

* typo

* Missing )

* Apply suggestions from code review

Co-authored-by: Lysandre Debut <lysandre@huggingface.co>

Co-authored-by: Lysandre Debut <lysandre@huggingface.co>

tests/test_tokenization_openai.py

@@ -87,7 +87,7 @@ class OpenAIGPTTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
     def test_padding(self, max_length=15):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
-            with self.subTest("{} ({})".format(tokenizer.__class__.__name__, pretrained_name)):
+            with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
                 # Simple input