Fixes ImportError

celery/contrib/sphinx.py

@@ -32,11 +32,13 @@ Use ``.. autotask::`` to manually document a task.
 """
 from __future__ import absolute_import, unicode_literals
 
+from inspect import formatargspec
+
 from sphinx.domains.python import PyModulelevel
 from sphinx.ext.autodoc import FunctionDocumenter
 
 from celery.app.task import BaseTask
-from celery.five import formatargspec, getfullargspec
+from celery.five import getfullargspec
 
 
 class TaskDocumenter(FunctionDocumenter):