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_phobert.py

@@ -39,7 +39,7 @@ class PhobertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
         with open(self.vocab_file, "w", encoding="utf-8") as fp:
             for token in vocab_tokens:
-                fp.write("{} {}".format(token, vocab_tokens[token]) + "\n")
+                fp.write(f"{token} {vocab_tokens[token]}\n")
         with open(self.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))