Change some uses of cStringIO.StringIO to io.StringIO.
This is undoubtedly insufficient and in some cases just as broken as before.
diff --git a/Lib/shelve.py b/Lib/shelve.py
index 697ae4f..5aa8263 100644
--- a/Lib/shelve.py
+++ b/Lib/shelve.py
@@ -56,17 +56,8 @@
the persistent dictionary on disk, if feasible).
"""
-# Try using cPickle and cStringIO if available.
-
-try:
- from cPickle import Pickler, Unpickler
-except ImportError:
- from pickle import Pickler, Unpickler
-
-try:
- from cStringIO import StringIO
-except ImportError:
- from StringIO import StringIO
+from pickle import Pickler, Unpickler
+from io import StringIO
import UserDict
import warnings