Make test_inspect pass once again.
diff --git a/Lib/inspect.py b/Lib/inspect.py
index d2546f1..372013b 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -313,7 +313,7 @@
         doc = object.__doc__
     except AttributeError:
         return None
-    if not isinstance(doc, types.StringTypes):
+    if not isinstance(doc, basestring):
         return None
     try:
         lines = doc.expandtabs().split('\n')