Change basestring to six.string_types

1 files changed, 6 insertions, 3 deletions

diff --git a/checkers/strings.py b/checkers/strings.py
index f517c4c..03c557a 100644
--- a/checkers/strings.py
+++ b/checkers/strings.py
@@ -30,6 +30,9 @@ from pylint.checkers import BaseChecker, BaseTokenChecker
 from pylint.checkers import utils
 from pylint.checkers.utils import check_messages
 
+import six
+
+
 _PY3K = sys.version_info[:2] >= (3, 0)
 _PY27 = sys.version_info[:2] == (2, 7)
 
@@ -231,7 +234,7 @@ class StringFormatChecker(BaseChecker):
         args = node.right
 
         if not (isinstance(left, astroid.Const)
-                and isinstance(left.value, basestring)):
+                and isinstance(left.value, six.string_types)):
             return
         format_string = left.value
         try:
@@ -260,7 +263,7 @@ class StringFormatChecker(BaseChecker):
                 for k, _ in args.items:
                     if isinstance(k, astroid.Const):
                         key = k.value
-                        if isinstance(key, basestring):
+                        if isinstance(key, six.string_types):
                             keys.add(key)
                         else:
                             self.add_message('bad-format-string-key',
@@ -365,7 +368,7 @@ class StringMethodsChecker(BaseChecker):
             return
 
         named_fields = set(field[0] for field in fields
-                           if isinstance(field[0], basestring))
+                           if isinstance(field[0], six.string_types))
         if num_args and manual_pos:
             self.add_message('format-combined-specification',
                              node=node)