Apply suggestions from code review

Co-authored-by: Tomas R. <[email protected]>

Author: antocuni

Lib/_pyrepl/fancycompleter.py

@@ -160,11 +160,11 @@ def attr_matches(self, text):
             return []
 
         if len(names) == 1:
-            return ['%s.%s' % (expr, names[0])]  # only option, no coloring.
+            return [f'{expr}.{names[0]}']  # only option, no coloring.
 
         prefix = commonprefix(names)
         if prefix and prefix != attr:
-            return ['%s.%s' % (expr, prefix)]  # autocomplete prefix
+            return [f'{expr}.{prefix}']  # autocomplete prefix
 
         if self.config.use_colors:
             return self.colorize_matches(names, values)

Lib/test/test_pyrepl/test_fancycompleter.py

@@ -180,7 +180,7 @@ def test_complete_function_skipped(self):
     def test_unicode_in___dir__(self):
         class Foo(object):
             def __dir__(self):
-                return [u'hello', 'world']
+                return ['hello', 'world']
 
         compl = Completer({'a': Foo()}, ConfigForTest)
         matches = compl.attr_matches('a.')