Patch# 1258 by Christian Heimes: kill basestring.
I like this because it makes the code shorter! :-)
diff --git a/Lib/tarfile.py b/Lib/tarfile.py
index a840a1a..188b61e 100644
--- a/Lib/tarfile.py
+++ b/Lib/tarfile.py
@@ -2041,7 +2041,7 @@
         """
         self._check("r")
 
-        if isinstance(member, basestring):
+        if isinstance(member, str):
             tarinfo = self.getmember(member)
         else:
             tarinfo = member
@@ -2077,7 +2077,7 @@
         """
         self._check("r")
 
-        if isinstance(member, basestring):
+        if isinstance(member, str):
             tarinfo = self.getmember(member)
         else:
             tarinfo = member