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-rw-r--r--sphinx/setup_command.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/sphinx/setup_command.py b/sphinx/setup_command.py
index 733bc4e34..072af6c91 100644
--- a/sphinx/setup_command.py
+++ b/sphinx/setup_command.py
@@ -18,7 +18,7 @@ import sys
from distutils.cmd import Command
from distutils.errors import DistutilsOptionError, DistutilsExecError
-from six import StringIO, string_types
+from six import StringIO
from sphinx.application import Sphinx
from sphinx.cmd.build import handle_exception
@@ -129,7 +129,7 @@ class BuildDoc(Command):
if val is None:
setattr(self, option, default)
return default
- elif not isinstance(val, string_types):
+ elif not isinstance(val, str):
raise DistutilsOptionError("'%s' must be a %s (got `%s`)"
% (option, what, val))
return val