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/urlparse.py b/Lib/urlparse.py
index 8cc7a97..e5de53a 100644
--- a/Lib/urlparse.py
+++ b/Lib/urlparse.py
@@ -350,10 +350,7 @@
         else:
             fp = open(fn)
     else:
-        try:
-            from cStringIO import StringIO
-        except ImportError:
-            from StringIO import StringIO
+        from io import StringIO
         fp = StringIO(test_input)
     while 1:
         line = fp.readline()