commit 426e248febc4b86ea4512baaaa81966ab54c83da
author Eli Bendersky <eliben@gmail.com> Tue Jul 17 05:45:11 2012 +0300
committer Eli Bendersky <eliben@gmail.com> Tue Jul 17 05:45:11 2012 +0300
tree e328da11b7ab6473ef0e212e21d39b3fb2ceb025
parent daa4c6b2e68c8ab0d929d9f00db45819431b4e3d

Preserve the invariant tostring(elem) == b''.join(tostringlist(elem)) and add a test to make sure it keeps working

Lib/xml/etree/ElementTree.py

diff --git a/Lib/xml/etree/ElementTree.py b/Lib/xml/etree/ElementTree.py
index 10bf849..3981659 100644
--- a/Lib/xml/etree/ElementTree.py
+++ b/Lib/xml/etree/ElementTree.py
@@ -1190,9 +1190,15 @@
         def writable(self):
             return True
 
+        def seekable(self):
+            return True
+
         def write(self, b):
             data.append(b)
 
+        def tell(self):
+            return len(data)
+
     ElementTree(element).write(DataStream(), encoding, method=method)
     return data