Remove u-prefixes.

examples/summarization/utils_summarization.py

@@ -94,7 +94,7 @@ def process_story(raw_story):
 
 
 def _add_missing_period(line):
-    END_TOKENS = [".", "!", "?", "...", "'", "`", '"', u"\u2019", u"\u2019", ")"]
+    END_TOKENS = [".", "!", "?", "...", "'", "`", '"', "\u2019", "\u2019", ")"]
     if line.startswith("@highlight"):
         return line
     if line[-1] in END_TOKENS:

src/transformers/commands/user.py

@@ -34,8 +34,8 @@ class ANSI:
     Helper for en.wikipedia.org/wiki/ANSI_escape_code
     """
 
-    _bold = u"\u001b[1m"
-    _reset = u"\u001b[0m"
+    _bold = "\u001b[1m"
+    _reset = "\u001b[0m"
 
     @classmethod
     def bold(cls, s):