4 files changed, 4 insertions, 4 deletions
diff --git a/doc/sphinxext/numpydoc/comment_eater.py b/doc/sphinxext/numpydoc/comment_eater.py
index 74d0d4768..2c7f4da31 100644
--- a/doc/sphinxext/numpydoc/comment_eater.py
+++ b/doc/sphinxext/numpydoc/comment_eater.py
@@ -4,7 +4,7 @@ import sys
 if sys.version_info[0] >= 3:
     from io import StringIO
 else:
-    from cStringIO import StringIO
+    from io import StringIO
 
 import compiler
 import inspect
diff --git a/doc/sphinxext/numpydoc/compiler_unparse.py b/doc/sphinxext/numpydoc/compiler_unparse.py
index bb76f7ea3..c36389d13 100644
--- a/doc/sphinxext/numpydoc/compiler_unparse.py
+++ b/doc/sphinxext/numpydoc/compiler_unparse.py
@@ -18,7 +18,7 @@ from compiler.ast import Const, Name, Tuple, Div, Mul, Sub, Add
 if sys.version_info[0] >= 3:
     from io import StringIO
 else:
-    from cStringIO import StringIO
+    from io import StringIO
 
 def unparse(ast, single_line_functions=False):
     s = StringIO()
diff --git a/doc/sphinxext/numpydoc/docscrape.py b/doc/sphinxext/numpydoc/docscrape.py
index af76b86e5..59d3f9734 100644
--- a/doc/sphinxext/numpydoc/docscrape.py
+++ b/doc/sphinxext/numpydoc/docscrape.py
@@ -14,7 +14,7 @@ import collections
 if sys.version_info[0] >= 3:
     from io import StringIO
 else:
-    from cStringIO import StringIO
+    from io import StringIO
 
 class Reader(object):
     """A line-based string reader.
diff --git a/doc/sphinxext/numpydoc/plot_directive.py b/doc/sphinxext/numpydoc/plot_directive.py
index 9e92acabb..a7f4655ce 100644
--- a/doc/sphinxext/numpydoc/plot_directive.py
+++ b/doc/sphinxext/numpydoc/plot_directive.py
@@ -82,7 +82,7 @@ import sphinx
 if sys.version_info[0] >= 3:
     from io import StringIO
 else:
-    from cStringIO import StringIO
+    from io import StringIO
 
 import warnings
 warnings.warn("A plot_directive module is also available under "