lxml.etree and StrinIO strangeness

lxml-tests.py

import StringIO, lxml.etree

xmldata="<root>data</root>"
buffer=StringIO.StringIO(xmldata)
for event, element in lxml.etree.iterparse(buffer):
        print "%s %s %s" % (event, element.tag, element.text)

buffer=StringIO.StringIO()
buffer.write(xmldata)
for event, element in lxml.etree.iterparse(buffer):
        print "%s %s %s" % (event, element.tag, element.text)
buffer.close()