Merged revisions 78433 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

................
  r78433 | senthil.kumaran | 2010-02-25 02:33:37 +0530 (Thu, 25 Feb 2010) | 10 lines

  Merged revisions 78431 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

  ........
    r78431 | senthil.kumaran | 2010-02-25 02:25:31 +0530 (Thu, 25 Feb 2010) | 4 lines

    Fix for Issue7540 ; urllib2 will raise a TypeError when you try to add_data to
    a existing req object already having data.
  ........
................
diff --git a/Lib/urllib/request.py b/Lib/urllib/request.py
index d1d12e6..47fe75e 100644
--- a/Lib/urllib/request.py
+++ b/Lib/urllib/request.py
@@ -192,6 +192,9 @@
     # Begin deprecated methods
 
     def add_data(self, data):
+        if self.has_data():
+            raise TypeError("Request Obj already contains data: %s" %
+                            self.data)
         self.data = data
 
     def has_data(self):