diff --git a/jedi/evaluate/finder.py b/jedi/evaluate/finder.py
index 21ae824f..19f3bbcd 100644
--- a/jedi/evaluate/finder.py
+++ b/jedi/evaluate/finder.py
@@ -133,8 +133,8 @@ class NameFinder(object):
                                 continue
                 break
 
-        debug.dbg('finder.filter_name "%s" in (%s): %s@%s', self._string_name,
-                  self._context, names, self._position)
+        debug.dbg('finder.filter_name %s in (%s): %s@%s',
+                  repr(self._string_name), self._context, names, self._position)
         return list(names)
 
     def _check_getattr(self, inst):
diff --git a/jedi/evaluate/helpers.py b/jedi/evaluate/helpers.py
index 25c28cb3..8800885e 100644
--- a/jedi/evaluate/helpers.py
+++ b/jedi/evaluate/helpers.py
@@ -191,9 +191,9 @@ def is_compiled(context):
 
 def is_string(context):
     if context.evaluator.environment.version_info.major == 2:
-        str_classes = (str, unicode, bytes)
+        str_classes = (unicode, bytes)
     else:
-        str_classes = (str,)
+        str_classes = (unicode,)
     return is_compiled(context) and isinstance(context.get_safe_value(default=None), str_classes)