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With ET 1.3, you should have an explicit keyword argument "xml_declaration":
# ----
 if xml_declaration or (xml_declaration is None and
 encoding not in ("utf-8", "us-ascii")):
 if method == "xml":
 write("<?xml version='1.0' encoding='%s'?>\n" % encoding)
# ----
In ET 1.2.6, the same snippet looks like:
# ----
 if encoding != "utf-8" and encoding != "us-ascii":
 file.write("<?xml version='1.0' encoding='%s'?>\n" % encoding)
# ----