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Here is how to reproduce the bug:
from xml.etree.ElementTree import parse
import io
xml1 = """<?xml version="1.0" encoding="utf8"?>
<test>text</test>"""
xml2 = """<?xml version="1.0" encoding="utf-8"?>
<test>text</test>"""
f1 = io.StringIO(xml1)
f2 = io.StringIO(xml2)
tree2 = parse(f2) # this uses "utf-8" and works fine
tree1 = parse(f1)
Traceback (most recent call last):
 File "<pyshell#20>", line 1, in <module>
 tree1 = parse(f1)
 File
"/home/mark/opt/python30a3/lib/python3.0/xml/etree/ElementTree.py", line
823, in parse
 tree.parse(source, parser)
 File
"/home/mark/opt/python30a3/lib/python3.0/xml/etree/ElementTree.py", line
561, in parse
 parser.feed(data)
 File
"/home/mark/opt/python30a3/lib/python3.0/xml/etree/ElementTree.py", line
1201, in feed
 self._parser.Parse(data, 0)
xml.parsers.expat.ExpatError: unknown encoding: line 1, column 30