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-rw-r--r--sphinx/jinja2glue.py3
1 files changed, 1 insertions, 2 deletions
diff --git a/sphinx/jinja2glue.py b/sphinx/jinja2glue.py
index c3ed86e09..739437a16 100644
--- a/sphinx/jinja2glue.py
+++ b/sphinx/jinja2glue.py
@@ -17,7 +17,6 @@ from jinja2 import FileSystemLoader, BaseLoader, TemplateNotFound, \
contextfunction
from jinja2.sandbox import SandboxedEnvironment
from jinja2.utils import open_if_exists
-from six import string_types
from sphinx.application import TemplateBridge
from sphinx.util import logging
@@ -33,7 +32,7 @@ if False:
def _tobool(val):
# type: (unicode) -> bool
- if isinstance(val, string_types):
+ if isinstance(val, str):
return val.lower() in ('true', '1', 'yes', 'on')
return bool(val)